PHYSIOLOGICAL AND BIOCHEMICAL EVALUATION OF RICE GENOTYPES FOR COLD TOLERANCE
Loading...
Date
2020-11-26
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES, BANGALORE
Abstract
An experiment was conducted using 30 rice genotypes comprised of test genotypes as well as cold tolerant check varieties (CTH-1 and CTH-3) in 2019-2020, to study cold tolerance based on physiological and biochemical parameters like germination percentage, changesin coleoptiles length, seedling length, proline content, electrolyte leakage, relative leaf chlorophyll content etc., at Department of Crop physiology, COA., V.C. Farm Mandya of UAS Bangalore. Under laboratory condition with four temperatures viz., 28oC (control), 10oC, 12oC and 15oC (cold) revealed that among the genotypes used for the study, Thanu, Daksha, KRH-4, NLR-3042, BPT × BR-6, GVT-501, GVT-4, Jyoti, Raksha, KMP-149 and IR-64 found superior for physiological parameters like germination percentage, seedling length, changes in coleoptiles length etc., further the promising rice varieties found in laboratory screening were evaluated in the field for cold tolerance, conducted during late kharif, (2019-20) in V.C farm Mandya under three different dates of sowing. The genotypes had shown different responses in three dates of sowing. The genotypes Thanu, Daksha, Raksha, BPT × BR-6, KRH-4, Jyoti, GVT-501, KMP-128, and KMP-200 were found to be better for cold tolerance in the laboratory as well as in field condition for
yield grain, panicle exertion, spikelet sterility, relative chlorophyll content, proline content, electrolyte leakage etc.,. The new genotypes used in the study performed better than the tolerant check varieties CTH-1 and CTH-3 in terms of yield, physiological and biochemical parameters, they can be used for further studies like QTL and Marker assisted selection for further crop improvement in breeding programme.