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Screening for Osmotic Stress Responses in Rice Varieties under Drought Condition

Rice science 2017年第5期24卷 253-263页

作者： Simon SWAPNA korukkanvilakath samban shylaraj Rice Research Station Department of Plant Breeding and Genetics Kerala Agricultural University Vyttila Ernakulam 682019Kerala India

Drought is the major abiotic stress factor that limits rice production *** evaluate the osmotic stress responses in rice varieties under drought condition,a total of 42 high-yielding rice varieties were collected from various research stations of Kerala Agricultural University in *** experimental setup comprises of initial hydroponic treatments at different osmotic potentials,artificially induced by desired strengths of polyethylene glycol(PEG6000),and followed by the pot planted experiments in the *** activities of antioxidant enzymes,relative water content,cell membrane stability,photosynthetic pigments,proline content,along with plant growth parameters of the varieties under drought condition were ***,the standard scores of these rice varieties were assessed under stress and recovery conditions based on the scoring scale of the Standard Evaluation System for *** the 42 rice varieties,we identified 2 rice varieties,Swarnaprabha and Kattamodan,with less leaf rolling,better drought recovery ability as well as relative water content,increased membrane stability index,osmolyte accumulation,and antioxidant enzyme activities pointed towards their degree of tolerance to drought *** positive adaptive responses of these rice varieties towards drought stress can be used in the genetic improvement of rice drought resistance breeding program.

关键词： drought resistance rice antioxidant enzyme osmolyte relative water content

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