Influence of drought hardening on the resistance physiology of potato seedlings under drought stress

In this paper, the influence of drought hardening on the growth, development, resistance physiology, leaf microstructure and stomatal behavior of potato seedlings under drought stress was studied, and the mechanism of drought hardening improvement of potato seedling drought resistance was elucidated. We found that drought stress had several adverse effects on potato seedlings, yet drought hardening alleviated the decrease in relative water content（RWC）, net photosynthetic rate（Pn） and chlorophyll content and inhibited the increase in relative electric conductivity and malondialdehyde（MDA） content. Compared with contrast seedlings, drought-hardened seedlings also had enhanced root vigor, increased antioxidant enzyme activity and higher levels of abscisic acid（ABA）, proline（Pro）, soluble sugars and polyamines（PAs） under drought stress. In addition, the stomatal density of potato seedling leaves increased significantly, while the leaf area, stomatal size and stomatal aperture decreased with drought hardening treatment. These changes led to reduced leaf transpiration rate（Tr） and improved water utilization efficiency（WUE）. The changes in leaf microstructure also had a positive effect on the drought resistance of the drought-hardened potato seedlings. So it can be concluded that through increasing the content of some endogenous hormones, osmotic regulatory substances and the activities of antioxidant enzymes, the resistance physiology of drought-hardened potato seedlings was enhanced.

Genetic Analysis of Stripe Rust Resistance of Xikemai 6 at Adult Plant Stage

To confirm resistance and genetic rules of Xikemai 6 against physiological races of wheat stripe rust,physiological races CYR31,CYR32 and CYR33,Su11-4 and V26 were inoculated in Xikemai 6 and Mingxian 169 and their hybrid progenies F_1,F_2 and F_3 at adult plant stage on March 2015. The results showed that the resistance of Xikemai 6 against CYR31 was controlled by 2 pairs of dominant genes and a pair of recessive genes; the resistance against CYR32 was controlled by three pairs of dominant resistant genes（ two pairs of genes performed cumulative effect）; the resistance against CYR33 was controlled by a pair of dominant genes and a pair of recessive genes; the resistance against Su11-4 was controlled by a pair of dominant genes and a pair of recessive genes independently or collaboratively; the resistance against V26 was controlled by a pair of dominant genes independently. Due to good performance of Xikemai 6 in test and production,as well as years of resistance identification and genetic analysis,Xikemai 6 was proved to be an excellent cultivar with good resistance against stripe rust,and the inheritance of its resistance was stable,so Xikemai 6 could be used as a germplasm resource and resistance material with excellent comprehensive character. Molecular marker and localization could be further studied,to provide new resistance parents for disease-resistant breeding of wheat.

Expression of Resistin Protein in Normal Human Subcutaneous Adipose Tissue and Pregnant Women Subcutaneous Adipose Tissue and Placenta

The expression of resistin protein in normal human abdominal, thigh, pregnant women abdominal, non-pregnant women abdominal subcutaneous adipose tissue and placenta and the relationship between obesity, type 2 diabetes mellitus （T2DM）, pregnant physiological insulin resistance （IR） and gestational diabetes mellitus （GDM） was investigated. The expression of resistin protein in normal human abdominal, thigh, pregnant women abdominal, non-pregnant women abdominal subcutaneous adipose tissue and placenta was detected by using Western blotting method. Fasting serum glucose concentration was measured by glucose oxidase assay. Serum cholesterol （CHOL）, serum triglycerides （TG）, serum HDL cholesterol （HDL-C） and serum LDL cholesterol （LDL-C） were determined by full automatic biochemical instrument. Fasting insulin was measured by enzyme immunoassay to calculate insulin resistance index （IRI）. Height, weight, systolic blood pressure （SBP） and diastolic blood pressure （DBP） were measured to calculate body mass index （BMI） and body fat percentage （BF%）. Resistin protein expression in pregnant women placental tissue （67 905±8441） （arbitrary A values） was much higher than that in subcutaneous adipose tissue in pregnant women abdomen （40 718 ± 3818, P〈 0. 01 ）, non-pregnant women abdomen （38 288±2084, P〈0.01）, normal human abdomen （39 421±6087, P〈0.01） and thigh （14 942 ±6706, P〈0.001） respectively. The resistin expression in abdominal subcutaneous adipose tissue showed no significant difference among pregnant, non-pregnant women and normal human, but much higher than that in thigh subcutaneous adipose tissue （P〈0. 001）. Pearson analysis revealed that resistin protein was correlated with BMI （r=0.42）, fasting insulin concentration （r=0.38）, IRI （r=0.34）, BF% （r=0.43） andfasting glucose （r=0.39）, but not with blood pressure, CHOL, TG, HDL-C and LDL-C. It was suggested that resistin protein expression in human abdominal subcutaneous adipose tissue was much higher than that in human thigh subcutaneous adipose tissue. Resistin was closely related with central obesity, leading to IR, subsequently obesity and T2DM. Resistin protein expression in placental tissue was much higher than that in subcutaneous adipose tissue in normal human abdomen, pregnant abdomen, non-pregnant women abdomen and thigh. It was indicated that resistin protein could be secreted from human placental tissue. Resistin might be one of the factors that lead to pregnant physiological IR and GDM.

Resistin protein expression in abdominal subcutaneous adipose tissue and placenta in pregnant women

Objective： To explore the expression of resistin protein in abdominal subeutaneons adipose tissue and placental tissue in pregnant women and the relationship between pregnant physiological insulin resistance （IR） and gestational diabetes ruellitus （GDM）. Methods： The expression of resistin protein in abdominal subcutaneous adipose tissue of pregnant and nonpregnant women and placental tissue was rueasured using western blotting method. Fasting serum glucose concentration was rueasured by glucose oxidase assay. Systohc blood pressure （SBP） and diastohc blood pressure （ DBP ） were rueasured. Results ： Resistin protein expression in placental tissue （67905±8441）（arbitrary OD units）was much higher than that in abdominal subcutaneous fat tissue in pregnant women （40718±3818） （ P 〈 0.01 ） and nonpregnant women （ 38288 ± 2084 ） （ P 〈 0.01 ） respectively, and there was no significant difference in abdominal subcutaneous fat tissue among pregnant and nonpregnant women. Conclusion： Resistin protein expressign in placental tissue is much higher than that in abdominal subcutaneous fat tissue in pregnant and nonpregnant women. Resistin protein is secreted from hmnan placental tissue. Resistin is one of the factors which lead to pregnant physiological IR and GDM.