The accumulation of citric acid and associated correlative strain indexes were investigated in the seedlings of Puccinellia tenuiflora (Griseb.) Scribn. et Merr. stressed with 0-175 mmol/L Na 2CO 3. The results ...The accumulation of citric acid and associated correlative strain indexes were investigated in the seedlings of Puccinellia tenuiflora (Griseb.) Scribn. et Merr. stressed with 0-175 mmol/L Na 2CO 3. The results showed that the citric acid accumulation is a specific physiological respond of this plant to alkali_stress. On the contrary, the citric acid content decreased slightly in this plant stressed with 0-400 mmol/L neutral salt NaCl. The accumulation of citric acid increased with increasing strength of alkali_stress, the citric acid content increased gently when the strength was lower than 100 mmol/L Na 2CO 3, but increased obviously when the strength was higher than 100 mmol/L Na 2CO 3. The citric acid rapidly accumulated at early alkali_stress, an obvious raise can be mensurated after 4 h. About 48 h after treatment, the amount of citric acid accumulated nearly reached the maximum. In various parts of P. tenuiflora seedlings alkali_stressed for 144 h, the order of citric acid content from high to low is: old leaf, mature leaf, old leaf sheath, young leaf sheath, young stem, old stem, and young leaf. In the mature leaf, the citric acid content gradually increased with increasing strength of alkali_stress, while the citric acid content increased sharply in old leaf and sheath just for strength higher than 125 mmol/L. There was little change of citric acid content in stem, but no change in young leaf. The results of the experiment showed that citric acid was outstanding among accumulated organic acid caused by alkali_stress. The contribution of other organic acids was negligible.展开更多
[Objective]The research aimed to study the biomass structure of the functional modules of clonal population of Puccinellia tenuifora on Songnen Plain and its relationship with the functional modules quantitatively.[Me...[Objective]The research aimed to study the biomass structure of the functional modules of clonal population of Puccinellia tenuifora on Songnen Plain and its relationship with the functional modules quantitatively.[Method]Using the sample method of digging up the whole tiller tuft randomly at flowering stage,the relationships between the biomass of functional modules and turf size,biomass of different modules and the clone production,reproductive tillers of clones and the biomass of component modules of Puccinellia tenuifora clones on Songnen Plain were quantitatively analyzed.[Result]The biomass of sexual reproductive module,photosynthesis module and supporting module showed a linear increase with the increasing of turf size（P 〈0.05）,while the linear relationship between the biomass of vegetative reproductive module and turf size did not reach the significant level（P 〉0.05）.The restriction degree of turf size on the biomass of functional modules was supporting module sexual reproductive module photosynthesis module vegetative reproductive module.Biomass of reproductive tillers and vegetative tillers showed a linear increase as the biomass of total modules increased（P〈 0.05）,while the linear correlation between the biomass of tillering seedlings and biomass of total modules did not reach the significant level（P 〉0.05）.Biomass of stem,spike and leaf of reproductive plants showed a linear functional increase as reproductive tiller increased（P 〈0.05）,and the ratio of accumulation of biomass of stem,spike and leaf was 7：2：1.[Conclusion]The research laid the theoretical foundation for the further research on the ecology of clustered clone plants.展开更多
文摘The accumulation of citric acid and associated correlative strain indexes were investigated in the seedlings of Puccinellia tenuiflora (Griseb.) Scribn. et Merr. stressed with 0-175 mmol/L Na 2CO 3. The results showed that the citric acid accumulation is a specific physiological respond of this plant to alkali_stress. On the contrary, the citric acid content decreased slightly in this plant stressed with 0-400 mmol/L neutral salt NaCl. The accumulation of citric acid increased with increasing strength of alkali_stress, the citric acid content increased gently when the strength was lower than 100 mmol/L Na 2CO 3, but increased obviously when the strength was higher than 100 mmol/L Na 2CO 3. The citric acid rapidly accumulated at early alkali_stress, an obvious raise can be mensurated after 4 h. About 48 h after treatment, the amount of citric acid accumulated nearly reached the maximum. In various parts of P. tenuiflora seedlings alkali_stressed for 144 h, the order of citric acid content from high to low is: old leaf, mature leaf, old leaf sheath, young leaf sheath, young stem, old stem, and young leaf. In the mature leaf, the citric acid content gradually increased with increasing strength of alkali_stress, while the citric acid content increased sharply in old leaf and sheath just for strength higher than 125 mmol/L. There was little change of citric acid content in stem, but no change in young leaf. The results of the experiment showed that citric acid was outstanding among accumulated organic acid caused by alkali_stress. The contribution of other organic acids was negligible.
基金Suppported by National High Technology Research and Development Program of China (2008AA10Z224)National Natural Science Foundation of China(30960261,30700055)Ph. D. Programs Foundation of Ministry of Education of China(20070200005)~~
文摘[Objective]The research aimed to study the biomass structure of the functional modules of clonal population of Puccinellia tenuifora on Songnen Plain and its relationship with the functional modules quantitatively.[Method]Using the sample method of digging up the whole tiller tuft randomly at flowering stage,the relationships between the biomass of functional modules and turf size,biomass of different modules and the clone production,reproductive tillers of clones and the biomass of component modules of Puccinellia tenuifora clones on Songnen Plain were quantitatively analyzed.[Result]The biomass of sexual reproductive module,photosynthesis module and supporting module showed a linear increase with the increasing of turf size（P 〈0.05）,while the linear relationship between the biomass of vegetative reproductive module and turf size did not reach the significant level（P 〉0.05）.The restriction degree of turf size on the biomass of functional modules was supporting module sexual reproductive module photosynthesis module vegetative reproductive module.Biomass of reproductive tillers and vegetative tillers showed a linear increase as the biomass of total modules increased（P〈 0.05）,while the linear correlation between the biomass of tillering seedlings and biomass of total modules did not reach the significant level（P 〉0.05）.Biomass of stem,spike and leaf of reproductive plants showed a linear functional increase as reproductive tiller increased（P 〈0.05）,and the ratio of accumulation of biomass of stem,spike and leaf was 7：2：1.[Conclusion]The research laid the theoretical foundation for the further research on the ecology of clustered clone plants.
