Physiological Basis of Stagnant Flooding Tolerance in Rice
Received date: 2016-02-01
Accepted date: 2016-08-23
Online published: 2016-12-28
Stagnant flooding (SF) is an important constraint which prolonges partial submergence damages of rice plants and reduces grain yield. Due to the heterogeneity in flood-prone ecosystem, many different types of traditional rice varieties are being grown by the farmers. The local landraces adapted to extreme in water availability could be the sources of new gene(s) which would be utilized to improve the adaptability of rice to SF with high yield. The main goal of this study is to identify new genetic resources tolerant to SF based on morpho-physiological traits. A total of 16 rice varieties were selected after initial screening from more than 400 rice varieties which were collected from eastern states of India. The increase rate of plant height was higher under SF compared to control, whereas no such trend was observed in the increment rate of aboveground total dry weight and culm dry weight. Area of aerenchyma gas spaces per tiller increased whereas root oxidase activity decreased under SF. The reduction of root oxidase activity, leaf area, and leaf dry weight was higher in susceptible varieties under SF compared to control. Stability index for different grain yield and yield attributes revealed that the impact of SF differed among different varieties. Correlation coefficient studies among different parameters taking stability index showed significant association with the grain yield. Based on the findings, it was concluded that maintenance of equivalent panicle weight and panicle number, plant height and harvest index at the maturity stage, leaf area, leaf and culm dry weights, root oxidase activity and tiller numbers at the flowering stage under SF compared to control help the plant to counteract the adverse effects of SF.
Key words： morpho-physiological trait; rice; stagnant flooding; yield
R. Kuanar Sandhya, Ray Anuprita, K. Sethi Santosh, Chattopadhyay Krishnendu, K. Sarkar Ramani . Physiological Basis of Stagnant Flooding Tolerance in Rice[J]. Rice Science, 2017 , 24(2) : 73 -84 . DOI: 10.1016/j.rsci.2016.08.008
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