Indian Society of Genetics & Plant Breeding

HETEROSIS IN MULTIPLE ENVIRONMENTS FOR YIELD COMPONENTS AND ITS RELATION WITH GENETIC DIVERGENCE IN COTTON

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Heterosis for four major yield components of G. hirsutum L. cotton was estimated in a half
diallel cross of nine genetically diverse parents. The heterosis in a single environment was
102.3% for boll number, 51.6% for boll weight and 1393 and 169.4% for seed cotton and lint
yield, respectively. Boll number appeared to be the major component of yield heterosis.
G
X E interaction was detected for all the four traits studied. The hybrids Laxmi X Kop-557
at Rahuri, Kop 557
X Kh-2 and Kop·557 X AC·738 at Padegaon, and Kop-557 X Kop-495 at
Jalgaon, were most heterotic, while Reba·B-SO
X Kh-2 and Laxmi X MCU·5 with standard
heterosis of 47.1 and 25.3%, respectively, for seed cotton yield over H-4, were most
promising. High heterotic crosses are not necessarilyhigh yielding. While selectingparents
for hybrid breeding programme on the basis of genetic divergence, their per se or cluster
mean performance also needs to be considered.
  

Keywords: Heterosis, multiple environments, genetic divergence.

Info

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

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