Indian Society of Genetics & Plant Breeding

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GENETIC ANALYSIS OF PINK BOLLWORM RESISTANCE AND OTHER QUANTIATIVE CHARACTERS IN COTTON

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Generation mean analysis was done by using six parameter model in an interspecific cross
between a pink bollworm resistant local variety of Gossypium hirsutum and the highly
susceptible variety P.S.H.-1 of G. barbadense by using Pl, P2, Fl, F2, BCl and BCz. Mean
values of Fl were intermediate between two parents for pink bollworm damage,
loculeslboll, 'seedslboll and fibre length while for seed-cotton yield/plant, bolls/plant and
lint index they exceeded the better parent. The Fz means were significantly lower than Fl
for pink bollwormdamage,seed-cottonyield/plant, bolls/plant, and fibre length. Backcross
means were intermediate between Fl and their respective recurrent parent. Scale tests and
joint scaling test revealed presence of epistatic interactions for all the characters except for
loculeslboll. Additive gene effects predominated in the inheritance of most characters
followed by dominance gene effects. Additive, dominance and additive x additive gene
effects were involved in the inheritance of pink bollworm resistance. For seed-cotton
yield/plant, bollstplant and fibre length epistasis was of complementary type. Duplicate
epistasis for pink bollworm damage is suggested to be desirable. Reciprocal recurrent
selection method of breeding·issuggested for further improvement in resistance and other
agronomic characters.
 

Keywords: Pectinophora gossypiella, generation mean analysis, epistasis, host plant resistance.

Info

Year: 1994
Volume: 54
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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