Genetic Analysis on Seed Dormancy in Groundnut (Arachis hypogaea L.)
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Date
2011
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Publisher
UAS, Dharwad
Abstract
Pre-harvest sprouting in groundnut (Arachis hypogaea L.) seeds belonging to
subspecies fastigiata is undesirable. Since it leads to substantial loss of seeds, both in
quantity and quality. A short period of dormancy is therefore desirable in the subspecies
to reduce such losses. Evaluation of fresh seed dormancy was conducted for
two seasons to determine the intensity and duration of dormancy in mapping
population wherein 268 RILs lines developed from crosses between the moderately
dormant parent GPBD-4 and non dormant parent TAG-24.
The intensity of dormancy ranged from 0 to 100% in summer season. Whereas
in kharif season ranged 0 to 90%. There was large variation in the intensity of
dormancy which could be related to genetic differences between the entries tested.
When intensity of dormancy is considered the RIL no. 165, 259, 160, 172, 209, 254,
213, 247, and 248 recorded very high values above 70 per cent in two seasons. While
RIL no. 84, 89, 110, 195, 257 and 267 fluctuated widely for intensity of dormancy
over seasons. The variation for dormancy in terms of duration as revealed by G 70
estimates was subsequently large as compared to the intensity of dormancy among
268 dormant RILs. The RIL no. 5, 40, 84, 165, 183, 209, 213, 248, 254, 259 and 265
were found to have more than two weeks of dormancy (G 70) in all the two seasons.
A period of 2-3 weeks of dormancy was exhibited by RIL no. 5, 30, 40, 84, 110, 165,
183, 219 and 267 during Kharif and RIL no. 5, 40, 84, 89, 165, 172, 267 and 183
during summer. The study has given evidence that for seed dormancy in this mapping
population is controlled by duplicate recessive area.
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Genetics and Plant Breeding