Genetic analysis of ratooning ability of rice (Oryza sativa L.)


Genetic analysis of generation means of F1, F2, F3, F4, and the parental populations of the cross IR10154-23-3-3A/IR15795-232-3-3-2 for ratooning ability was conducted. Good ratooning ability is a recessive trait. The parents differed by at least two pairs of major genes for ratooning ability. A large proportion of transgressive segregants in F2 suggested that the expression of ratooning ability is influenced not only by major genes but also by modifiers. Broad-sense heritability estimates computed by different methods ranged from 0.66 to 0.88. Narrow-sense heritability by the F4–F3 regression method was 0.39. The heritability estimates were 0.42 and 0.33 by the variance component method. The prevalence of additive x additive type of gene effects along with prominent additive effects imply some scope for selection in the segregating generations. However, non-additive type of gene action also affects the expression of ratooning ability.

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Chauhan, J.S., Lopez, F.S.S. & Vergara, B.S. Genetic analysis of ratooning ability of rice (Oryza sativa L.). Euphytica 40, 97–102 (1989).

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Key words

  • Oryza sativa
  • rice
  • ratooning ability
  • genetics