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Response of leaf photosynthesis to vapor pressure difference in rice (Oryza sativa L) varieties in relation to stomatal and leaf internal conductance



Response of leaf photosynthesis to vapor pressure difference in rice (Oryza sativa L) varieties in relation to stomatal and leaf internal conductance



Plant Production Science 11(2): 184-191



In the afternoon when air humidity decreases, leaf photosynthetic rate (P-n) often declines in rice grown under irrigated conditions. To clarify the genotypic difference of P-n in response to humidity, we measured P-n and stomatal conductance (g(s)) for nine rice varieties with diverse genetic backgrounds, at various vapor pressure differences (VPD) and developmental stages. P-n and g(s) of all the varieties decreased with VPD increase from 1.0 to 2.3 kPa of VPD. The variety with high g(s) at low VPD exhibited a greater decline of g(s) with VPD increase than the variety with low g(s), but cv Takanari showed the highest g(s) under altered VPD conditions. Significant logarithmic relations were found between the decreased P-n and g(s) at the respective developmental stages, suggesting that g(s) is the dominant factor determining P-n and its response to VPD change. To explicate the effect of decreased g(s) on P-n, we analyzed the relations by using the model that accurately estimated the (genotypic difference in P-n at a low VPD with g(s) and leaf nitrogen content per unit leaf area in the previous study The model assuming that leaf internal conductance (g(w)) remains unchanged well explained the decreased P-n at high VPDs by g(s) change alone. The analysis also suggested the constancy of g(w) and carboxylation capacity at high VPD. It is concluded that the genotypic difference in the decrease of P-n at a high VPD is brought mainly by that in decreased g(s), and the varieties with a high g(s) always exhibit a high P-n owing to their relatively high g(s) at either high or low VPD environments.

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Accession: 023518368

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DOI: 10.1626/pps.11.184



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