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The Indian Journal of Genetics and Plant Breeding
Year : 1994, Volume : 54, Issue : 2
First page : ( 149) Last page : ( 154)
Print ISSN : 0019-5200.

Genetics of yield and its components in rice (O. sativa L.)

Ram T.*

Central Agricultural Research Institute, Port Blair 744101.

* Present address: Directorate of Rice Research, Rajendranagar, Hyderabad 500030.

Received:  28  October,  1992; Accepted:  29  March,  1994.


The components of gene effect for yield and five yield traits were studied in four crosses usinga popular indigenous cultivar as one parent. The character means over six 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 100-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 100-grain weight in the crosses IR 50 x C 14-8 and C 14-8 x Vijaya, and for plant height in C14-8 x IR64 and C14-8 x Vijaya. In general, most crosses revealed duplicate nonallelic interactions for majority of characters. All the crosses exhibited heterosis in F1 and inbreeding depression in F2 generation.



Rice, generation means, yield components, gene effects.


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