Abstract
Seventy three rice varieties were evaluated for their variability with regards to yield and yield components. Estimates of heritability and genetic advance in per cent of mean were also obtained for the above traits. In addition, studies on character associations and path coefficients were also undertaken. The results revealed high variability, heritability and genetic advance in per cent of mean for grain yield while panicle bearing tillers and 1000 grain weight had recorded high heritability coupled with low genetic advance as per cent of mean. Further, yield was observed to be positively associated with panicle bearing tillers and number of filled grains per panicle and these characters were noticed to exert high direct effects on grain yield per plant. High indirect effects of most of the traits were noticed mostly through panicle bearing tillers per hill indicating importance of the trait as selection criteria in crop yield improvement programmes.SAARC J. Agri., 13(1): 99-108 (2015)
Highlights
Rice is the most consumed cereal grain in the world
Significant mean squares due to genotypes were observed for all traits, indicating the existence of sufficient variation among the genotypes for yield and yield component characters studied in the present investigation, and there is a scope for effective selection
Information on mean, range, Phenotypic Coefficient of Variability (PCV), Genotypic Coefficient of Variability (GCV), heritability, genetic advance and genetic advance in per cent of mean for yield and yield component traits are furnished in table 2
Summary
Rice is the most consumed cereal grain in the world. It is staple food crop for more than half of the world’s human population. Yield enhancement is the major breeding objective in rice breeding programmes and knowledge on the nature and magnitude of the genetic variation governing the inheritance of quantitative characters like yield and its components is essential for effective genetic improvement. Studies on path co-efficient provide useful information regarding the direct and indirect effects of different yield component characters on grain yield and aid in the identification of effective selection criteria for effective yield improvement. The present investigation was undertaken in this context to elucidate information on variability, heritability, genetic advance, character associations and path of effect in promising rice genotypes of Acharya N G Ranga Agricultural University, Andhra Pradesh, India
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