Indian Society of Genetics & Plant Breeding
The components of gene effect for yield and five yield traits were studied in four crosses
using a popularindigenous cultivaras one parent. The charactermeans oversix generations
were subjected to scaling test. In the presence of epistasis, six-parameter model was used
to detect all types of gene effects. The analysis revealed the importance of dominance and
epistatic components for yield, tillers/plant, grains/panicle and lOO-grain weight in all the
crosses. Additive and dominance effects were important for plant height and panicle
length. Among the digenic interactions additive x additive and dominance x dominance
effects contributed more in most of the characters. Additive x dominance gene effects was
important for l00-grain weight in the crosses IR 50 x C 14-8 and C 14-8 x Vijaya, and for
plant height in C 14-8 x IR 64 and C 14-8 x Vijaya. In general, most crosses revealed duplicate
nonallelic interactions for majority of characters. All the crosses exhibited heterosis in Fl
and inbreeding depression in F2 generation.
Keywords: Rice, generation means, yield components, gene effects.
Year: 1994
Volume: 54
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
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