Indian Society of Genetics & Plant Breeding

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HETEROSIS AND INBREEDING DEPRESSION IN INDIAN MUSTARD

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Thirty three mustard (Drassica juncea) hybrids derived from crosses of eleven lines and
three testers along with their FI, F1 and parents were evaluated to estimate heterosis,
inbreeding depression and combining ability. Manifestation of heterosis was maximum
for secondary branches per plant and minimum for primary branches per plant. In general,
high heterosis for a trait was accompanied by significant inbreeding depression. The
estimates of sca were greater than the gca for yield and its components. The use of at least
one, preferably both, good general combiners in a particular cross for the trait under
consideration was advocated. Based on these results it is suggested that heterotic response,
level of inbreeding depression and gca effects of the parents, if considered together, can be
helpful in identification of crosses which are likely to yield better performing pure lines
by applying suitable breeding procedures.
 

Keywords: Heterosis, inbreeding depression, combining ability, Indian mustard

Info

Year: 1993
Volume: 53
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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