ASSESSMENT OF GENETIC VARIABILITY FOR SEED DORMANCY IN GERMPLASM ACCESSIONS OF RICE (Oryza sativa L.)
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Date
2019-11-25
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
In the present investigation, 44 rice genotypes were characterized for 60
morphological traits to assess the genetic variability, dormancy and its duration and
chemical methods to overcome dormancy. The experiment was conducted in augmented
design at NSP, UAS, GKVK, Bengaluru during Kharif 2018. Coleoptile colour, presence
of auricle and ligule etc. were monomorphic some were bimorphic, trimorphic and the
remaining were polymorphic, which are useful to distinguish rice genotype. Analysis of
variance indicated significant differences among the genotypes for yield and its
components traits. The estimates of PCV and GCV were moderate to high while those of
heritability were high for plant height, tillers per plant, productive tillers per plant, panicle
weight per plant,
seed yield per plant, suggesting that phenotypic selection in germplasm
accessions of rice would be effective. Thirty four genotypes were very weak, five
genotypes were weak, three genotypes were moderate and two genotypes were strong in
their dormancy reaction signifying considerable amount of variability exists among the
accessions. Seed dormancy positively correlate with seed length and seed length to width
ratio while negatively correlate with seedling vigour index I. Seed treatment with GA3 at
1000 ppm found most effective in breaking seed dormancy resulted in high per cent
germination (92.20 %), mean seedling length (50.3 cm) and vigour index-I (4612) than
other treatments.