Instantaneous Response of Leaf Stomatal Behavior to Light Quality under Two Irrigation Levels in Summer Maize

doi:10.3969/j.issn.1000-6362.2017.02.006

Abstract

Abstract: The LI-6400 portable photosynthesis system was used to measure the stomatal conductance (Gs), net photosynthetic rate (Pn) and transpiration (Tr) of the first functional leaf of summer maize (Zhengdan 958) under irrigation and no irrigation during three growth periods (jointing, tasselling and filling stages). While measuring these physiological indicators, red to blue ratio was set at 0, 25%, 50%, 75% and 100% to analyze its effects on the stomatal behavior of summer maize. The instantaneous leaf water use efficiency was also calculated from measurements of these physiological indicators. The results showed that compared with no-irrigation, the mean values of Gs, Pn and Tr in leaves were significantly higher under the irrigation treatment at the tasselling stages, but the differences between both treatments were not significant at the jointing and filling stage. Under both two water treatments, the Gs, Pn and Tr were maximum under the pure red light and decreased with the increase of blue light proportion. Considering the water-saving effect, higher ratio of red to blue light can improve the WUE of maize leaves.

Key words: Water stress, R/B ratio, Maize, Photosynthesis, Leaf water use efficiency

LI Yuan-yuan, GONG Dao-zhi, YAN Wei-guang, TANG Da-hua, MEI Xu-rong, Zhang Wen-ying. Instantaneous Response of Leaf Stomatal Behavior to Light Quality under Two Irrigation Levels in Summer Maize[J]. Chinese Journal of Agrometeorology, 2017, 38(02): 113-120.

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