Indian Society of Genetics & Plant Breeding
Combining ability and heterosis were studied in line x tester crosses between 24
female and 4 male parents for fibre yield in kenaf. The gca and sca variances
showed that gene action was predominantly additive. The accessions, CPI-072111
and CPI- 78891 and the variety AMC-108 were good general combiners. None of
the crosses showed significant positive sca effect for fibre yield. But eight crosses
showed 30-40% heterosis over popular variety HC-583. In absence of male sterile
line in kenaf, mannual production of hybrid seed and subsequent exploitation of
heterosis becomes prohibitive due to high cost of Fl seed production. Hence an
attempt was made to study the extent of residual heterosis present in F2 due to
predominance of additive genes so that F2 seeds may be utilized to get heterotic
effect with lower cost of seed production as has been done in other crops. Fibre
yield performance of two generations (Fl and F2) of selected cross combinations
and two standard check varieties (HC- 583 and AMC-108) were studied and decline
in yield from Fl and F2 was observed.
Results showed that three crosses each between one exotic germplasm and one
indigenous variety retained substantial amount of residual heterosis in F2 generation
that may be exploited and utilized commercially with lower cost of seed production.
Keywords: Kenaf, Hibiscus cannabinus, residual heterosis
Year: 1999
Volume: 59
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
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