Response of Leaf Photosynthesis to Vapor Pressure Difference in Rice (Oryza sativa L) Varieties in Relation to Stomatal and Leaf Internal Conductance(Crop Physiology & Ecology)
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概要
- 論文の詳細を見る
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.
- 日本作物学会の論文
著者
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HOMMA Koki
Graduate School of Agriculture, Kyoto University
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HORIE Takeshi
Graduate School of Agriculture, Kyoto University
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Ohsumi Akihiro
Division Of Agronomy Graduate School Of Agriculture Kyoto University:(present Office)national Instit
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Homma Koki
Graduate School Of Agriculture Kyoto University
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Hamasaki Akihiro
Division of Agronomy, Graduate School of Agriculture, Kyoto University
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Nakagawa Hiroshi
Ishikawa Prefectural University
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Homma Koki
Division of Agronomy, Graduate School of Agriculture, Kyoto University
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Horie Takeshi
Division of Agronomy, Graduate School of Agriculture, Kyoto University
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Shiraiwa Tatsuhiko
Division of Agronomy, Graduate School of Agriculture, Kyoto University
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Hamasaki Akihiro
Division Of Agronomy Graduate School Of Agriculture Kyoto University
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Shiraiwa Tatsuhiko
Graduate School Of Agriculture Kyoto University
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Shiraiwa Tatsuhiko
Res. Inst. Humanity And Nature Kyoto Jpn
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