PJB-2024-332
PHYSIOLOGICALCHARACTERIZATION OF TRADITIONAL RICE LANDRACES BY INDUCING DROUGHT STRESS USING POLY ETHYLENE GLYCOL
C. Tamilselvi
Abstract
The severity of abiotic stresses is distending day by day with the perplexity of climate change. Of the various abiotic stresses affecting rice cultivation, drought and high temperature stress have higher impact in the growth and yield potential. Modern day improved varieties lack the capability to withstand the adverse environmental conditions mainly due to the absence of inbuilt genetic mechanism. On the other hand, traditional land races are a rich source of genetic pool with wide variety of inbuilt genetic mechanism for tolerating abiotic stress elements especially drought that have been naturally evolved over time and would serve as potential donors for improving the drought tolerance potential of high yielding varieties. Hence the present research was carried out to study the drought tolerance potential of 15 traditional rice landraces by using PEG 6000 as aninvitro bioassay method. The 15 genotypes were subjected to drought stress at 5 various concentrations such as -2,-4,-6,-8,-10 bars of water potential. Parameters such as germination percentage, shoot length, root length, seedling vigour index were observed and data were collected and compared with the control.The study revealed that Chengalpattu Sirumani, Pisini and Karungkuruvaiwere highly drought tolerant showing significant germination per cent combined with high seedling vigour index and root length and hence could serve as potential donors for improving drought tolerance. The land race Mettumaranelluexhibited a higher germination per cent in all the levels of water potential but failed to show significant vigour index.
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