Indian Society of Genetics & Plant Breeding

PARTIAL DIALLEL CROSS ANALYSIS OF YIELD AND ITS RELATED CHARACTERS IN RICE (ORYZA SATIVA 1.) UNDER IRRIGATED AND RAINFED SITUATIONS

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In partial diallel crossanalysisinvolving16 parents in rice (Oryza sativa 1.),both dominant
and additive gene actions were found to play important roles in character expression. In
the set grown irrigated situation, 9 traits, and in the set grown under rainfed situation, 8
traits were found to be predominantly controlled by nonadditive gene actions. These
included important traits like grain yield, tiller number/plant, and No. of fertile spikelets
per panicle. Panicle length, grain length, plant height and spikelet density were primarily
determined by additive gene actions. Although the relative magnitudes of estimates of
additivity and dominance were considerably influenced by growing situations, the
direction of change was variable for different traits. In spite of these variations, however,
the parents identified to be good general combiners for different traits from two sets
generally the same. Important among these were Roti for grain size, IR 52 for harvest index,
and IR SO and IR 36 for tillers/plant.
  

Keywords: Partial diallel, general combining ability.

Info

Year: 1991
Volume: 51
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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