Rajendra Prasad, S.RAMESH, CHANNANNAVAR2020-10-072020-10-072019-11-25Th-12542https://krishikosh.egranth.ac.in/handle/1/5810152722In 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.EnglishThesis