English

K Senapati B,Kumar Awaneet

doi:10.5897/ajb2014.13961

Abstract

Twenty two (22) recombinant inbreed lines (RIL’s) derived from interspecific cross derivative of Oryza sativa and Oryza rufipogon along with two local check varieties MTU 7029 and Ranjit were evaluated in randomized block design (RBD) with two replications at two different environments (1 st at Regional Research Station, New Alluvial Zone (NAZ), Bidhan Chandra Krishi Viswavidyalaya, Sub-Centre, Chakdah, Nadia, West Bengal during Kharif season 2009 and 2 nd at Instructional Farm, Bidhan Chandra Krishi Viswavidyalaya, Jaguli, Nadia, during Kharif season 2010), to study the polygenic variations in yield for yield and its attributing characters and their cause and effect relationship. The analysis of variances revealed the significant differences among the 24 genotypes against all the characters except panicle weight, grain length, grain breadth and grain L/B ratio. The magnitude of phenotypic coefficients of variation (PCV) was higher than genotypic coefficients of variation (GCV) for all the characters suggesting the influences of the environmental forces on the expression of these characters. High PCV and GCV values were observed in grain yield per plant, 1000 grain weight, L/B ratio, grain breadth and panicle weight. High heritability coupled with moderate to high genetic advance as percent of mean for plant height, panicle weight, grain length, grain L/B ratio, 1000 grain weight and yield per plant while low heritability estimates along with low genetic advance were observed for fertility percentage and florets number per panicle. In general, genotypic correlation coefficients were higher than their corresponding phenotypic correlation coefficients. Path coefficient analysis revealed that number of characters chosen was very much appropriate as evident from low value of residual effect. Maximum positive direct effect was imparted by number of gains per panicle followed by grain L/B ratio, days to 50% flowering and panicle length respectively. Florets number per panicle imparted the maximum negative direct effect followed by grain breadth, fertility percentage and panicle number per plant. Per se performance revealed that two lines viz; KS-7 and KS-13 were promising in respect of grain yield and some other yield related traits. Number of grains per panicle and floret number per panicle give significant positive correlation with yield. Key words: Correlation, genotypic coefficients of variation, genetic advance, heritability, phenotypic coefficients of variation, rice, recombinant inbreed lines.

Highlights

Genettic ass sessme ent of some pheno otypic v variants of rrice (Orryza sp pp.) fo or some e quan ntative e chara acters under the Gangatic plains o of Westt Beng gal
22 recombinant inbreed d lines (RIL’s) and checks varieties in environment 1, environment 11 and pooled data over the two environments are presented in Table 1, 2 and 3, respectively
The character like days to 50% flowering, days to maturity, panicle length, fertility percentage and number of grains per panicle showed moderate to high heritability values associated with moderate to low genetic, advance, suggesting that the inheritance of such traits might be under control of both additive and non-additive gene effects

Summary

Introduction

Genettic ass sessme ent of some pheno otypic v variants of rrice (Orryza sp pp.) fo or some e quan ntative e chara acters under the Gangatic plains o of Westt Beng gal. The character like days to 50% flowering, days to maturity, panicle length, fertility percentage and number of grains per panicle showed moderate to high heritability values associated with moderate to low genetic, advance, suggesting that the inheritance of such traits might be under control of both additive and non-additive gene effects.

Results

Conclusion