Effects of Different Water Depth on Leaf Physiological Characteristics of Early Rice During Panicle Primordium Suffered to Low Temperature

doi:10.3969/j.issn.1000-6362.2015. 05.004

Abstract

Abstract: Taking early rice Lingliangyou 268 as a material, a field experiment with 3 water layer treatments was conducted in Nanjing University of Information Science and Technology during panicle primordium stage under low temperature damage (15-19 May) in 2014, which included water layer 0-1cm (CK), water layer 3-4cm (ZH), and water layer 8-10cm (SH). The leaf temperature, content of photosynthetic pigment, net photosynthetic rate, transpiration rate and leaf antioxidant of different treatments were measured every two days, to explore the effect of low temperature on leaf physiological and biochemical characters. The results showed that the leaf temperature of all treatments was lower than the air temperature, and much more obvious with time extension, in which, ZH and SH were higher than CK. This indicated that proper depth water layer was helpful to maintain the leaf temperature. All of the leaf chlorophyll content decreased significantly, with a maximum drop for SH. The net photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) decreased significantly, with slightly for ZH. Net photosynthetic rate and transpiration rate of CK were higher than others, while the water use efficiency of leaf of ZH was highest. Net photosynthetic rate of SH decreased and its water use efficiency and transpiration rate increased. The content of catalase (CAT) and malondialdehyde (MDA) in leaves of all treatments decreased significantly, with the rate of ZH＞CK＞SH, while the superoxide dismutase (SOD) activity increased slightly and the peroxidase (POD) activity increased significantly. All these treatments could resistance to low temperature damage and slow the effect of early rice leaf antioxidant enzyme activity change, in which ZH was most effectively.

Key words: Leaf temperature, Panicle primordium, Low temperature, Enzyme activity

TAN Meng-xiang, JING Yuan-shu, XUE Yang,ZENG Wen-quan. Effects of Different Water Depth on Leaf Physiological Characteristics of Early Rice During Panicle Primordium Suffered to Low Temperature[J]. Chinese Journal of Agrometeorology, 2015, 36(05): 553-560.

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