Physiological performance of two contrasting rice varieties under water stress
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- 作者：Furqan Khan ; Priyanka Upreti ; Ruchi Singh…
- 关键词：Carbon discrimination ; Drought ; Oryza sativa ; Oryzanol ; Phenolic acids ; Water use efficiency
- 刊名：Physiology and Molecular Biology of Plants
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：23
- 期：1
- 页码：85-97
- 全文大小：
- 刊物主题：Plant Sciences; Plant Physiology; Biological and Medical Physics, Biophysics; Cell Biology;
- 出版者：Springer India
- ISSN：0974-0430
- 卷排序：23
文摘
Two rice varieties PR-115 and Super-7 were imposed to water stress and different physiological traits were monitored to evaluate the performance of these varieties under drought. Under water stress condition although the relative water content, osmotic potential, chlorophyll content, photosynthesis rate, carbon discrimination and biomass decreased in both the varieties however, the reduction was more pronounced in Super-7 variety. Oryzanol a trans-ester of ferulic acid functions as antioxidant and it increased along with total phenolic and anthocyanin content in both the varieties under drought stress. However, gallic acid, 4 hydroxy benzoic acid, syringic acid and chlorogenic acid showed differential pattern in both of the varieties under water limiting conditions. Under drought, grain yield was penalized by 17 and 54% in PR-115 and Super-7 varieties, respectively in comparison to watered plants. Super-7 variety showed pronounced electrolyte leakage and MDA enhancement under water stress condition. High non photochemical quenching and reduction in Y(NO) and Y(II) indicated balanced energy management in tolerant PR-115 variety. The studies showed that PR-115 is a drought tolerant variety while Super-7 is drought sensitive in nature.