Study on the Changes of Physiological Indexes of Water Spinach in Eutrophication Water

[Objective] Effect of hypoxic water culture on physiological characteristic of water spinach and its hypoxia tolerance were studied.[Method] Water spinach was planted in soil and eutrophication water by means of floating bed,respectively,and the change of physiological indexes including chlorophyll,proline（Pro）,malondialdehyde（MDA）,soluble sugar and soluble protein in water spinach leaves at mature stage was researched,while the hypoxia tolerance of water spinach and the effect of plant density on water spinach growth were discussed in our paper.[Result] In the hypoxic eutrophication water,the content of total chlorophyll,malondialdehyde,soluble sugar and soluble protein in water spinach leaves was lower than that of soil culture,with higher proline content,which showed that water spinach had better tolerance to hypoxic eutrophication water;the higher the plant density,the lower the chlorophyll content in water spinach leaves,and there was no significant effect of plant density on proline and malondialdehyde content,while soluble protein content was higher under high plant density.[Conclusion] The best plant density of water spinach was 66 plants per floating bed with the area of 2 m2,which could provide theoretical basis for the application of water spinach in floating bed.

Effect of Cold Stress on Some Physiological Indexes of Plants in Malvaceae

The paper was to study the change trend of the physiological indexes in plants of Malvaceae under normal and low temperature condition.The result showed that the increase extent of electrical conductivity of plants with cold tolerance in Malvaceae was significantly lower than the plant without cold tolerance under the cold stress condition,while their proline contents and soluble protein contents were all higher than the plants without cold tolerance.The above physiological indicators all can be used for the screening of varieties with cold tolerance in Malvaceae,which will also provide theoretical guidance for the cold tolerance screening of other garden plants.

Seasonal Variation of Physiological and Biochemical Indexes of White-tibetan Sheep

In this study, to understand the variation regulation of physiological and biochemical indexs of White-Tibetan sheep with seasons, the physiological and bio- chemical indexs of White-Tibetan sheep in Hongyuan Areas of Sichuan Province in four seasons were measured. The results showed that the respiratory change range of white-Tibetan sheep in four seasons was from （32.74±21.33） to （49.96±17.62） times/min, and the variation ranges of body temperature and heart rate were from （39.27±1.05） to （39.73±0.31） ℃ and from （88.75±8.32） to （104.63±10.39） times/min, respectively. The indexes of WBC, MCV, MCH and MCHC in autumn and winter were extremely significantly lower than those in spring and summer, while RBC,HCT and RDW-CV in autumn and winter were extremely significantly higher than those in spring and summer, HGB and PLT changed in different seasons with no signifi- cance. The indexes of AST,TP, ALB, GLO and LDH in summer and autumn were relatively higher than those in winter and spring, while the indexes of PCHE, GLU, CHOL and CA in summer and autumn were relatively lower than those in winter and spring, however, the indexes of ALT and ALP were relatively higher in spring and autumn.

Effects of Cadmium Stress on Physiological and Biochemical Indexes in Different Maize Cultivars

[Objective] This paper aimed to investigate the effects of cadmium（Cd）stress on physiological and biochemical indexes in different maize cultivars and provide theoretical basis for the study on heavy metal ecotoxicology.[Method] The maize cultivars includeing Tienan 2,Yingdan 11 and Zhengdan 958 which were widely planted in Liaoning Province were selected as the experimental materials.And then the effects of different Cd2＋ concentrations on seed germination,physiological and biochemical indexes of young seedlings were investigated.[Result] The lower Cd2＋ concentration showed some the stimulation effect on seed germination of maize,while the higher concentration had obvious inhibitory effect to some extend.The seed germination of all the maize verities was obviously inhibited when the Cd2＋ concentration was more than 5 mg/L.And with the increasing of the Cd2＋ concentration,the seedling growth,exosmic conductivity and chlorophyll content of the maize varieties with different tolerance to Cd2＋ were distinctly changed.[Conclusion] The resistance of Tienan 2 to Cd2＋ was significantly higher than that of the other two varieties.

Exogenous calcium enhances the physiological status and photosynthetic capacity of rose under drought stress

Drought(water shortage)can substantially limit the yield and economic value of rose plants(Rosa spp.).Here,we characterized the effect of exogenous calcium(Ca^(2+))on the antioxidant system and photosynthesis-related properties of rose under polyethylene glycol 6000(PEG6000)-induced drought stress.Chlorophyll levels,as well as leaf and root biomass,were significantly reduced by drought;drought also had a major effect on the enzymatic antioxidant system and increased concentrations of reactive oxygen species.Application of exogenous Ca^(2+)increased the net photosynthetic rate and stomatal conductance of leaves,enhanced water-use efficiency,and increased the length and width of stomata following exposure to drought.Organ-specific physiological responses were observed under different concentrations of Ca^(2+).Application of 5 mmol·L^(-1)Ca^(2+)promoted photosynthesis and antioxidant activity in the leaves,and application of 10 mmol·L^(-1)Ca^(2+)promoted antioxidant activity in the roots.Application of exogenous Ca^(2+)greatly enhanced the phenotype and photosynthetic capacity of potted rose plants following exposure to drought stress.Overall,our findings indicate that the application of exogenous Ca^(2+)enhances the drought resistance of roses by promoting physiological adaptation and that it could be used to aid the cultivation of rose plants.

Effects of Pyrene Stress on Growth and Physiological Indexes of Maize(Zea mays L.) Seedling

[Objective]The paper was to explore the effects of pyrene stress on growth and physiological indexes of maize seedling.[Method] The effects of different concentrations of pyrene（0,0.5,1.0,and 2.0 mg/L） on growth and several physiological indexes,such as chlorophyll content,malnodiadehyde（MDA） content of both leaves and roots of maize（Zea Mays L.） seedlings of Shixiang 1（sensitive variety） and Guangtian 3（tolerant variety） were studied by a hydroponic experiment.[Result]As the concentration of prene increasing within the test concentration range,the contents of chlorophyll a and chlorophyll b in Shixiang 1 first increased and then decreased;relative growth yield and absolute growth rate showed the decreasing trend;MDA contents in roots and leaves showed the increasing trend.Relative growth yield,absolute growth rate and chlorophyll a content in Guangtian 3 first increased and then decreased;chlorophyll b and MDA contents in roots showed the increasing trend;MDA contents in leaves showed the decreasing trend.Compared with control,chlorophyll a and chlorophyll b contents of Shixiang 1 significantly increased under pyrene concentration of 0.5-1.0 mg/L,which significantly decreased as the concentration of pyrene ≥2.0 mg/L;MDA contents in roots and leaves significantly increased as the concentration of pyrene ≥1.0 mg/L,while relative growth yield and absolute growth rate significantly decreased.Chlorophyll a and chlorophyll b contents in Guangtian 3 significantly increased as the concentration of pyrene ≥1.0 mg/L.Pyrene concentration had significantly negative correlation with relative growth yield and absolute growth rate of Shixiang 1,while it had significant positive correlation with MDA contents in roots.Pyrene concentration had significant positive correlation with chlorophyll b and MDA contents in roots of tolerant variety Guangtian 3.[Conclusion]The study provided basis for the management measures of maize during its seedling stage.

Effect of Lead Stress on Growth Characteristics and Physiological Indexes of Alternanthera philoxeroides

[Objective] The paper aimed to discuss effects of different concentrations of lead stress on Alternanthera philoxeroides growth and physiological indices,to explore phytoremediation methods for removal of lead pollution. [Method] A. philoxeroides in water culture was treated with different concentration of lead,and then,its external injury was observed,its growth and physiological indexes were measured. [Result] A. philoxeroides biomass and chlorophyll content decreased; conductivity and malonaldehyde （MDA ） content were increased; the SOD,POD and CAT activities showed a trend of first increase and then decrease with increase in concentration of lead stress. [Conclusion] With increase in lead concentration,the cell membrane permeability increased and MDA had a higher accumulation,antioxidant enzymes activity decreased,the normal oxidative metabolism of A. philoxeroides was severely affected,leading it to wilt.

Effects of Waterlogging Stress on Growth and Physiological Index in Cucumber Seedlings

The effects of waterlogging stress on the growth, chlorophyll and MDA content of cucumber seedlings were studied by using cucumber varieties （Cucumis sativus L. cv. Jinyan No.7） as materials. The results show that plant height, leaf number, shoot fresh weight, total root length, total projected area and total surface area of cucumber seedlings showed insignificant differences with those of the control; root fresh weight, root average diameter, total root volume were significantly higher, but the number of root tips and furcation number increased first and then reduced; the chlorophyll content of cucumber seedlings was significantly lower than that of control; MDA content was significantly higher than that of control under waterlogging stress. It was showed that the cucumber was tolerant to waterlogging stress, but the ability of waterlogging stress was limited, and the physiological was significantly hurt and photosynthesis of cucumber seedlings was significantly affected by waterlogging stress.

Changes in Physiological Indexes of SPDS Transgenic Potato Plants under Low Temperature Stress

Using potato plants overexpressing spermidine synthase（SPDS） gene as experimental materials, changes in chlorophyll content, malondialdehyde（MDA） content and superoxide dismutase（SOD） activity of potato leaves under low temperature stress were determined. According to the results, chlorophyll content of experimental plants showed a decreasing trend; MDA content of 01-47 was significantly higher than that of Atlantic; MDA content of 01-6 and 01-49 was significantly lower than that of Atlantic; SOD activity of 01-6 and 01-47 was higher than that of Atlantic. Potato lines 01-6 and 01-47 can be further cultivated to breed new cold-resistant potato varieties.

Effects of Melatonin on Growth,Physiology and Gene Expression in Rice Seedlings Under Cadmium Stress

Melatonin(MLT)is a hormonal substance found in many organisms and can improve plant stress resistance.In this study,the japonica rice variety Y32 and indica rice variety NJ6 were cultivated in hydroponics under different concentrations of CdCl2 at the two-leaf stage.The growth,physiological and biochemical responses of the seedlings and the expression of cadmium(Cd)-related genes under exogenous melatonin(MLT)treatment were assessed.The results indicated that Cd stress destroyed the dynamic balance between reactive oxygen species(ROS)production and removal,resulting in ROS accumulation,membrane lipid peroxidation,and impaired growth and development.Following the application of exogenous MLT to rice seedlings,increases in plant biomass including both underground and above-ground areas were observed.MLT also scavenged the inhibition of superoxide dismutase(SOD)and peroxidase(POD)in a concentration dependent manner in response to Cd stress.Catalase(CAT)activity and malondialdehyde(MDA)expression also decreased following MLT treatment.Amongst the six Cd-related genes assessed,five genes were downregulated and one was up-regulated in response to MLT treatment.Taken together,these data demonstrate that MLT improves the resilience of rice seedlings at the biochemical,physiological,and molecular levels,and diminishes the damage caused by Cd stress.

Relationship Between Hyperspectral Parameters and Physiological and Biochemical Indexes of Flue-Cured Tobacco Leaves

The experiment was set up for examining the physiological and biological indexes quickly and exactly, for obtaining information of tobacco-field fertilizing and tobacco growing. The ASD Field spec FR 2500 was used to measure spectra reflectance of flue-cured tobacco and the relationship between hyperspectral parameters and biochemical contents （total nitrogen, chlorophyll, carotenoid）, and physiological indexes （fresh weight, dry weight, moisture content） of flue-cured tobacco leaves was studied by correlation and stepwise regression statistic methods at different nitrogen and potassium levels. The results indicated that the spectra curves of different treatments had obvious rules and great diversities. There were high correlations between different types of spectra parameters and ten physiological and biochemical indexes of flue-cured tobacco leaves. Hyperspectral characteristic variables of ten physiological and biochemical indexes were found through stepwise regression, and SDr/SDb was the characteristic variable closest to seven biochemical contents. Simultaneously, the R2 and regression coefficient of equations reached 0.05 significant level and the equations had good estimating effects through the examination of other samples. Accordingly, this study suggested that the ten physiological and biochemical indexes could be estimated quickly by the estimating models, at the same time nitrogen-potassium fertilization and growth condition of flue-cured tobacco could be inspected.

Effect of Planting Density on Physiological Indexes, Agronomic Traits and Yield of Buckwheat ( Fagopyrum esculentum Moench.)

Ningqiao 1 was selected as the material to study the effects of planting density on physiological indices,agronomic traits and yield of buckwheat.The results showed that high density resulted in decreases of chlorophyll content,soluble protein content and activity of SOD,POD and CAT,and acceleration of MDA accumulation under drought conditions.Low density could effectively improve the grain number per plant,grain weight per plant,1000-grain weight and yield in drought conditions.

Seasonal Changes of Physiological and Biochemical Indexes of Tibetan Sheep

To investigate the seasonal changes in physiological and biochemical indexes of Tibetan sheep in Hongyuan area,we measured the physiological and biochemical indexes of Tibetan sheep at four different seasons. The results showed that the body temperature,respiration and heart rate of Tibetan sheep at four seasons were 39. 18- 39. 60 ℃,27. 20- 49. 04 times / min,91. 87- 106. 25 times / min,respectively. The indexes of WBC,MCV,MCH and MCHC in autumn and winter were significantly higher than those in spring and summer（ P 〈 0. 01）,while the indexes of RBC,HCT and RDW-CV in spring and summer were significantly higher than those in autumn and winter（ P 〈 0. 01）. The PLT did not vary greatly in spring,summer or autumn,but were all extremely higher than that in winter（ P〈 0. 01）. The HGB maintained stable in the four seasons. The indexes of TP,ALB and GLO in summer and autumn were extremely higher than those in winter and spring（ P 〈 0. 01）,while the indexes of ALP and PCHE in summer and autumn were extremely lower than those in winter and spring（ P 〈 0. 01）. The indexes of AST,ALT,LDH,GLU,CHOL and CA maintained stable in all seasons.

Physiological and Biochemical Indexes of Tibetan Sheep at Different Months of Age

To study the changes in physiological and biochemical indexes of Tibetan sheep from the plateau area at different months of age,we measured the physiological and biochemical indexes of Tibetan sheep reared in Hongyuan County of Sichuan Province according to their growth stages. The results showed that the respiration,body temperature and heart rate of Tibetan sheep at 3- 24 months of age were( 24. 60 ± 6. 33)-( 50. 30 ± 21. 18) times / min,( 39. 14 ± 0. 28) ℃-( 39. 64 ± 0. 17) ℃ and( 91. 00 ± 13. 27)-( 112. 00 ± 8. 69) times/min,respectively. The blood physiological indexes of Tibetan sheep including white blood cell count( WBC),hematocrit( HCT) and red blood cell distribution width coefficient of variation( RDW- CV) at 3,6,15 and 18 months of age were relatively lower than those at 9,12,21 and 24 months of age. The blood physiological indexes including red blood cell count( RBC),mean corpuscular capacity( MCV),mean corpuscular hemoglobin concentration( MCHC) and mean corpuscular hemoglobin( MCH) at 3,6,15 and 18 months of age were relatively higher than those at 9,12,21 and 24 months of age,while hemoglobin( HGB) and platelet count( PLT) did not vary with months of age. For blood biochemical indexes,alanine aminotransferase( ALT),albumin( ALB),globulin( GLO) and total cholesterol( CHOL) reached the maximum values at 21 months of age; alkaline phosphatase( ALKP),lactate dehydrogenase( LDH),blood glucose( GLU) and pseudocholinesterase( PCHE) reached the maximum values at 3 months of age;and total calcium( CA),total protein( TP),aspartate aminotransferase( AST) reached the maximum values at 9,18 and 24 months of age,respectively.

Analysis of Physiological and Biochemical Indexes of White-tibetan Sheep at Different Months of Age

To study the physiological and biochemical indexes of White-tibetan sheep in plateau environment, we measured the physiological and biochemical inde- xes of White-tibetan sheep at 3, 6, 9, 12, 15, 18,21 and 24 months of age. The results showed that the body temperature, respiration and heart rate of White-ti- betan sheep at 3 - 24 months of age were （38.89 ±0. 56） - （39.83 ± 0.32） ℃, （26.00±6.67 ） - （58.64 ± 12.67 ） times/rain and （ 83.90 ± 7.64） - （111.36 ±7.46） times/rain, respectively. The blood physiological indexes of WBC, HCT and RDW-CV at 3, 6, 15 and 18 months of age were lower than those at 9, 12, 21 and 24 months of age. On the contrary, the indexes of RBC, MCV, MCH and MCHC at 3, 6, 15 and 18 months of age were higher than those at 9, 12, 21 and24 months of age, while HGB and PLT did not vary with months of age. For blood biochemical indexes, ALT, AST, TP, ALB, LDH and CHOL reached the maximums at 21 months of age, while ALP, PCHE and GLU reached the maximums at 3 months of age. Besides, the GLO and GA reached the maxi- mums at 18 and 24 months of age, respectively. The physiological and biochemical indexes of White-tibetan sheep followed certain rules in growth and development process, and might be affected by plateau climate and season.

Analysis of Physiological and Biochemical Indexes of White Suffolk Sheep,White-tibetan Sheep and Tibetan Sheep

In order to compare the physiological and biochemical indexes of different sheep populations in plateau area,we measured the physiological and biochemical indexes of White Suffolk sheep,White-tibetan sheep and Tibetan sheep in four seasons.The body temperature,respiration and heart rate of White Suffolk sheep,White-tibetan sheep and Tibetan sheep throughout the year were（38.96±0.23）-（40.80±0.74）℃,（27.20±7.73）-（74.56±10.91）times/min,and（83.10±2.42）-（106.25±7.07）times/min,respectively.The main blood physiological indexes of White-tibetan sheep were between those of Suffolk sheep and Tibetan sheep or close to that of Tibetan sheep,the indexes of WBC in summer,HGB and RDW-CV in autumn,RDW-CV in winter were close to that of White Suffolk sheep.The main blood biochemical indexes of White-tibetan sheep were between that of White Suffolk sheep and Tibetan sheep or close to that of Tibetan sheep,but the indexes of ALB in spring,AST in summer,ALP and CHOL in autumn,and ALP in winter were close to that of White Suffolk sheep.It revealed that the adaptability of White-tibetan sheep was prior to White Suffolk sheep,and tended to Tibetan sheep in the plateau environment.

Influences of Different UV-B Radiation Treatments in Short Time on Some Physiological Characteristics of Winter Wheat Seedlings

[Objective] studying the influences of different UV-B radiation treatments in short time on some physiological characteristics of winter wheat seedlings was to provide reference for the mechanism of plant response to ultraviolet irradiation in short time. [Method] The winter wheat taken as materials were treated with 15 and 30 pW/cm^2 UV-B radiation, then the physiological indexes such as pigment content and photosynthetic rate were determined. [ Results] The UV-B treatment caused the declines of chlorophyll content, soluble protein content and water content of leaves, besides, dose-effect was existed. The decline of 30 pW/cm^2 treatment was bigger than that of 15 μW/cm^2 treatment. The influences of UV-B radiation on carotenoid content and anthocyanidin content were similar; the change trends were declined firstly then increased. The UVB treatment with two doses restrained the electron transport of PSⅡ, particularly; the inhibitory effect was biggest after treated 2 h, and then this effect was declined in 4, 6 and 8 h, so the dose-effect was existed. The UV-B radiation with two doses restricted photosynthetic rate and the inhibitory effect increased with the increase of treatment time. The high dose treatment caused huge damage to membrane system, while the result of low dose treatment was not obvious. [ Conclusion] UV-B radiation treatment had dose-effect on winter wheat seedlings in short time and the influence of high dose was bigger than that of low dose. With the increase of treatment time, the damage was alleviated; besides, the result was not similar to that of UV-B radiation in long time.

Effects of Low Temperature Stress on Physiological and Biochemical Characteristics of Podocarpus nagi

[Objective] The paper was to study the effect of low temperature stress on physiological and biochemical characteristics of Podocarpus nagi. [Method] Through the determination of physiological indices such as plasma membrane permeability, free proline content, soluble sugar content, malondialdehyde （MDA） content and chlorophyll content, the change law of these indices of P. nagi seedlings under natural conditions and artificially controlled low temperature conditions within the continuous 5 d was studied. [Result] The soluble sugar content, free proline content, MDA content and plasma membrane permeability of P. nagi seedlings were slightly in- creased compared with control; the chlorophyll content gradually decreased with the prolongation of low temperature stress. P. nagi seedlings produced active response to low temperature stress, so the low temperature injury P. nagi seedlings suffered was reduced. [Conclusion] The study provided theoretical basis for winter management in P. nagi cultivation in Hanjiang plain area.

Study on Physiological Activity of the Resistance of Medicago sativa to Thrips

[Objective] The experiment explored of resistance of different Medicago sativa through synthetic variations of all physiological indexes and the correlation analysis between physiological activity and damage degree after thrips damage. [Method] According to studying physiological activity (POD activity, SOD activity, PPO activity, PAL activity, MDA content and free proline content) of alfalfa in alfalfa resistance to different number of thrips, the correlation between physiological activity and resistance was investigated. [Result] It was shown that there were negative correlations among POD, SOD, PPO, PAL, MDA, free praline and the number of thrips, and there were negative correlations among POD, SOD, PPO, PAL, MDA, free praline and CAT. The content changes of POD,SOD,PPO,CAT,MDA and free proline in high resistant alfalfa were slow and PAL was quick and the activities of PPO,PAL,CAT were high, and the activities of POD、SOD were low. [Conclusion] The research provided theoretical basis and materials for identifying resistance varieties of alfalfa to thrip.

Research Progress of Heat-tolerance of Brassica campestris ssp. Chinensis

Brassica campestris ssp. chinensis, also known as non-heading Chinese cabbage, is an important vegetable widely distributed in southern China. High temperature is the most common adversity factor in vegetable production, because Brassica campestris ssp. chinensis is a thermophilic vegetable, which can＇t well grow at high temperature. In summer and autumn, high temperature stress would prevent Brassica campestris ssp. chinensis from growing and result in poor quality of its seedlings, seriously influencing yield and quality of the vegetable in later period. In this paper, present situation and latest advances in heat resistance research of Brassica campestris ssp. chinensis in recent years were reviewed at home and abroad. The research tendency in Bassica campestris ssp. chinensis was also described, providing reference for breeding of heat-resistant Brassica campestris ssp. chinensis.