Indian Society of Genetics & Plant Breeding

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Screening of rice (Oryza sativa L.) germplasm of North-Eastern India for early vegetative stage heat tolerance

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A total of 600 rice germplasm from the North-Eastern hills
of India were evaluated for their tolerance to high
temperature. Seeds of each genotype (pre-soaked
overnight) were germinated in plastic cups at three
different temperatures i.e., 40oC, 45oC and 50oC. A total of
78 genotypes showed more than 80% germination at 40oC,
while only 27 genotypes showed 60% or more germination
at 45oC. After heat treatment of the latter 27 genotypes at
40oC and 45oC at the seedling stage, 18 genotypes
successfully recovered from the 40oC treatment, while only
9 recovered after exposure to 45oC. These 9 genotypes
were found to contain 30-60% relative water content under
22 days of drought stress.

Keywords: Rice, Oryza sativa, germplasm, shoot length, heat tolerance

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Year: 2012
Volume: 72
Issue: 2
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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