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volume 24 issue 2 (june 2004) : 87 - 90
HETEROSIS AND INBREEDING DEPREsSION IN RACIAL DERIVATIVES OF GOSSYPJUMHIRSUTUM L. FOR BOLLWORM (HEUCOVERPA ARMIGERA HUBNffi) RESISTANCE
1Centre for Plant Breeding and Genetics
Tamil Nadu Agricultural University, Coirnbatore - 641003, India
ABSTRACT
Heterosis over mid parent and better parent in F 1 and inbreeding depression in the F 2s were studied for number of sympodia per plant, number of bolls per plant, seed cotton yield per plant, ginning outturn, boll damage and locule damage. The relative heterosis and heterobeltiosis were significant for seed cotton yield in all the six crosses. The relative heterosis was negatively significant for boll damage and locule damage confirming bollworm damage in the F 1, but compared to the better parent the bollworm damage was high in F 1. The inbreeding depression was positive for boll damage and locule damage in all the six crosses showing less bollworm damage in F 2 generation and it will be because of the segregation of resistant genes.
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Published In
Agricultural Science Digest