National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Thirty seven rice genotypes with reported cold tolerance at various phonological stages were used to evaluate for germination and seedling traits in laboratory conditions under three temperature regimes viz., normal (28°C), 8°C and 13°C respectively for identification of genotypes possessing seedling stage cold tolerance. The per se performance in cold environment was found to be related to parameters like germination percent, germination Index, root, shoot and seedling length and seedling vigour. In this context, it is very crucial to have a better understanding of the mechanism of cold tolerance at seedling stage, which is a potential production constraint in rabi. The response of genotypes differed with different low temperatures and was significant indicating the presence of considerable variability for cold tolerance at germination and seedling stage. Certain genotypes performed very well under 13°C and 8°C of temperatures for various seedling traits. However, few genotypes exhibited superior performance under 13°C but not performed well under 8°C of temperatures vice versa. On an overall basis HPR 1068, Himalaya-2216 and Vivek Dhan -82 showed lesser percentage of reduction for seedling vigour index at both temperatures and these genotypes can be used as cold tolerant donors in future breeding programs for development of seedling cold tolerant rice varieties.
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