Heterosis of maize photosynthetic performance |
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| Authors: | Xia Li Lianlu Li Meiyun Wang Zaisong Ding Ming Zhao |
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| Institution: | (1) College of Agronomy and Bio-technology, China Agricultural University, Beijing, 100094, China;(2) Institute of Crop Sciences, the Chinese Academy of Agricultural Sciences, Beijing, 100081, China |
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| Abstract: | Four maize inbred lines with different photosynthetic rates and their two hybrids were used as test materials, and the diurnal
variations of their photosynthesis parameters in the silking stage were measured to study the heterosis of photosynthetic
performance. Results showed that net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) all presented an obvious single-peaked curve in a day, with the peak values occurring at 10:00–12:00, 12:00, 10:00–12:00
a.m., respectively, while water use efficiency (WUE) had a “V” type variant trend, with the lowest value appearing at 12:00. The diurnal variation of Pn and Tr was correlated markedly with Gs, suggesting that Gs played an important role in regulating the diurnal variation of Pn and Tr, and Pn, Tr and Gs had a higher heterosis in the afternoon than in the morning, while the WUE was in reverse, indicating that maize hybrid had higher resistance to the high temperature and dehydration in the afternoon,
which provided a new path to select varieties with a high net photosynthetic rate.
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Translated from Chinese Journal of Applied Ecology, 2007, 18(5): 1049–1054 译自: 应用生态学报] |
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| Keywords: | maize (Zea mays L ) photosynthetic performance heterosis diurnal variation |
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