Selection of stable genotype on the basis of stability performance and sustainability index in rice (Oryza sativa L.)

Biparental Mating; A System of Intermating for Creating Genetic Variability in Segregating Generation for Crop Improvement

“…The seed yield in self pollinated crops is a function of number of branches, tillers, seed numbers and seed weight and there is need to strike a balance among these traits, for which increased variability is essential. Similar results earlier reported by Nagaraj et al, (2002), Narendra Singh (2004) in chickpea, Nanda et al, (1990) in bread wheat, Koli et al, (2012 and2013) in aromatic rice. The conventional breeding methods are impose restriction on the chances of better recombination's and also associated with the weakness of causing rapid homozygosis and low genetic variability.…”

“…This design separates the variance of progenies in three fractions, viz., (i) variance due to males (δ 2 m=¼ δ 2 A), (ii) variance due to female (δ 2 f==¼ δ 2 A) and, (iii) variance due to males x females (δ 2 m x f=1/4 δ 2 D). Significant differences among the biparental progenies for all the traits as whole, reported by Manickavelu et al, (2006) in rice, Rudra et al, (2009) in safflower, Yunus and Paroda (1983) in wheat, Somashekhar et al, (2010) in bhendi and Koli et al, (2013) in aromatic rice.…”

“…This design separate the variance into two fractions, viz., (i) variance among males (δ 2 m=¼ δ 2 A), and (2) variance due to males x female (δ 2 mxf =1/2 δ 2 D). This design earlier applied for create new populations with high frequencies in safflower by Rudra et al, (2009), Nemarullah andJha (1993) in wheat, Somashekhar et al, (2010) in bhendi (Abelmoschus esculentus L.) and Koli et al, (2013) in aromatic rice.…”