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2. Genotype variability in photosynthetic characteristics in finger millet
- Creator:
- Subrahmanyam, Desiraju
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- area leaf mass, Eleusine coracana, grain mass, harvest index, internal CO2 concentration, leaf area, net photosynthetic rate, stomatal conductance, and transpiration
- Language:
- Multiple languages
- Description:
- High variability in leaf gas exchange and related traits were found in 30 genotypes of field grown finger millet. The variability in carbon exchange rate per unit leaf area (PN) can be partly attributed to the differences in the stomatal conductance (gs) and area leaf mass (ALM). The PN was positively correlated with total dry matter (TDM). However, no relationship between PN and seed yield was found. The leaf area showed a positive and significant correlation with total biomass. None of the other gas-exchange traits had significant relationship either with TDM or with seed yield. The ALM showed a strong positive association with PN. However, it was not correlated with either total biomass or seed yield. As a result, the use of ALM as surrogate for PN for identifying high biomass producing genotypes only had a limited value. Hence selection for high PN would result in higher biomass producing types.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. Leaf gas exchange and grain yield of common bean exposed to spermidine under water stress
- Creator:
- Torabian, S., Shakiba, M. R., Dabbagh Mohammadi Nasab, A., and Toorchi, M.
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- fotosyntéza, photosynthesis, harvest index, number of pods, water deficit, 2, and 581
- Language:
- Multiple languages
- Description:
- Three prevalent aliphatic polyamines (PAs) include putrescine, spermidine, and spermine; they are low-molecular-mass polycations involved in many physiological processes in plants, especially, under stressful conditions. In this experiment, three bean (Phaseolus vulgaris L.) genotypes were subjected to well-watered conditions and two moderate and severe water-stressed conditions with and without spermidine foliar application. Water stress reduced leaf relative water content (RWC), chlorophyll contents, stomatal conductance (gs), intercellular CO2 concentration (Ci), transpiration rate, maximal quantum yield of PSII (Fv/Fm), net photosynthetic rate (PN), and finally grain yield of bean plants. However, spermidine application elevated RWC, gs, Ci, Fv/Fm, and PN, which caused an increase in the grain yield and harvest index of bean plants under water stress. Overall, exogenous spermidine could be utilized to alleviate water stress through protection of photosynthetic pigments, increase of proline and carotenoid contents, and reduction of malondialdehyde content., S. Torabian, M. R. Shakiba, A. Dabbagh Mohammadi Nasab, M. Toorchi., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
4. Response of wheat ear photosynthesis and photosynthate carbon distribution to water deficit
- Creator:
- Jia, S., Lv, J., Jiang, S., Liang, T., Liu, C., and Jing, Z.
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- photosynthesis, wheat, 14C-labelling, harvest index, malic enzyme, spike assimilate transport, Triticum aestivum L, 2, and 581
- Language:
- Multiple languages
- Description:
- Understanding distribution and transport of carbon assimilates and photosynthesis contribution to grain yield in wheat spike is important in assessing the photosynthetic process under stress conditions. In this study, photosynthetic characteristics were evaluated in a pot experiment. Transport of spike photosynthates to grain was demonstrated using 14C isotope tracer technique. Yield and key enzyme activities of C3 and C4 pathways were examined after anthesis in wheat cultivars of different drought resistance. The ear net photosynthetic rate, chlorophyll content of the spike bracts (glume, lemma, and palea), and relative water content slightly decreased under water deficit in drought resistant variety Pubing 143 (Pub) during the grain filling stage, whereas all parameters decreased significantly in drought sensitive variety Zhengyin 1 (Zhe). Grain 14C-photosynthate distribution rate fell by 3.8% in Pub and increased by 3.9% in Zhe. After harvest, the water-use efficiency of Zhe dropped by 18.7% under water deficit. Rubisco activity in ear organs declined significantly under water deficit, whereas activity of C4 pathway enzymes was significantly enhanced, especially that of phosphoenolpyruvate carboxylase and NADP-malate dehydrogenase. Water deficit exerted lesser influence on spike photosynthesis in Pub. Ear organs exhibited delayed senescence. Accumulation of photosynthetic carbon assimilates in ear bracts occurred mainly during the early grain filling and photosynthates were transported in the middle of grain filling. C4 pathway enzymes seem to play an important function in ear photosynthesis. We speculate that the high enzyme activity of the C4 pathway and the increased capacity of photosynthetic carbon assimilate transport were the reasons for the drought tolerance characteristics of ears., S. Jia, J. Lv, S. Jiang, T. Liang, C. Liu, Z. Jing., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public