Determinant of photosynthetic capacity in rice leaves under ambient air conditions |
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Authors: | D-Y?Zhang X-H?Wang Y?Chen Email author" target="_blank">D-Q?XuEmail author |
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Institution: | (1) Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, P.R. China;(2) China National Hybrid Rice Research and Development Center, Changsha, 410125, P.R. China |
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Abstract: | At the grain-filling stage, net photosynthetic rate (P
N), stomatal conductance (g
s), and ribulose-1,5-bisphosphate carboxylation efficiency (CE) were correlated in order to find the determinant of photosynthetic capacity in rice leaves. For a flag leaf, P
N in leaf middle region was higher than in its upper region, and leaf basal region had the lowest P
N value. The differences in g
s and CE were similar. P
N, g
s, and CE gradually declined from upper to basal leaves, showing a leaf position gradient. The correlation coefficient between P
N and CE was much higher than that between P
N and g
s in both cases, and P
N was negatively correlated with intercellular CO2 concentration (C
i). Hence the carboxylation activity or activated amount of ribulose-1,5-bisphosphate carboxylase/oxygenase rather than gs was the determinant of the photosynthetic capacity in rice leaves. In addition, in flag leaves of different tillers P
N was positively correlated with g
s, but negatively correlated with C
i. Thus g
s is not the determinant of the photosynthetic capacity in rice leaves.The study was supported by the State Key Basic Research and Development Plan (No.G1998010100). |
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Keywords: | carboxylation efficiency flag leaf intercellular CO2 concentration leaf position net photosynthetic rate Oryza stomatal conductance |
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