Response of a new IR50/Moroberekan recombinant inbred population of rice (Oryza sativa L.) from an indica × japonica cross for growth and yield traits under aerobic conditions

Abstract

Genetic variability, correlation, path coefficient analysis and test of normality was conducted in an F 8 recombinant inbred aerobic rice population developed by single seed descent method to evaluate its potential as a mapping population. Estimates of genotypic variance, phenotypic variance, genotypic coefficient of variance (GCV), phenotypic coefficient of variance (PCV), heritability in the broad sense (H) and expected genetic advance at 5% selection index (GA) for grain yield and other attributing characters were computed. In all the cases, PCV was higher than GCV indicating the influence of environment on the characters. High heritability coupled with high GA was observed for several plant traits; number of tillers, plant height, total number of spikelets panicle -1 , biomass plant -1 , straw weight, harvest index and grain yield plant -1 and hence offered good scope for selection. Grain yield plant -1 was found to be positively correlated with plant height, number of tillers, panicle length, panicle exsertion, number of panicles plant -1 , single panicle weight, test weight, number of fertile spikelets panicle -1 , straw weight, biomass plant -1 , harvest index and grain breadth both at genotypic and phenotypic levels. Harvest index exerted maximum positive direct effect, followed by biomass plant -1 and straw weight on grain yield plant -1 at phenotypic level. ShapiroWilks ''W test of normality'' indicated that the population was skewed towards female parent IR50 for some traits and for some others towards Moroberekan, the male parent. Most of the characters that showed skewness were platykurtic with a kurtosis value of less than 3.

Genetic analysis of mechanisms associated with inheritance of resistance to sheath rot of rice

“…High heritability estimates for PE corroborates with results reported by Sellammal, Robin, and Raveendran () and are, slightly, in contrast to Cruz, Milach, and Federizzi () and Girish et al. (), who reported moderate estimates of heritability.…”

Phenotypic and molecular characterization of a tomato (Solanum lycopersicum L.) F2 population segregation for improving shelf life

“…The phenomena of linkage drag, linkage disequilibrium, natural selection, and meiotic distortion may explain some of the deviation from normal distribution of traits in the F 2 populations of this cross. These influences have also been noted in a recombinant inbred line population of rice ('IR50' x 'Moroberekan') exhibiting a departure from normal deviation under aerobic conditions (Girish et al, 2006).…”

Mapping QTLs for Reproductive‐Stage Drought Resistance Traits using an Advanced Backcross Population in Upland Rice

“…A set of 289 advanced backcross (BC 1 F 3 ) lines derived from a cross between Apo, an improved indica upland variety (Venuprasad et al, 2012), as recurrent parent and Moroberekan, an upland japonica variety (Girish et al, 2006), as donor parent was used. Both of the parents are moderately tolerant to drought stress.…”