Indian Society of Genetics & Plant Breeding

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A COMPARATIVE STUDY OF HETEROSIS IN GMS BASED AND CONVENTIONAL INTRA ARBOREUM COTTON HYBRIDS

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A comparative study of heterosis over better parent was carried out during 1995 in
GMS based and corresponding conventional hybrids, which were generated by utilising
two genetic male sterile lines viz. 05-5 and GAKA-423 and their male fertile counter
lines as female parents respectively. The GMS based hybrids exhibited high heterosis
over better parent for seed cotton yield and its component characters compared to
conventional hybrids. The high yielding GMS based crosses showed simultaneous
heterosis for seed cotton yield and its component characters like number of bolls/plant,
boll weight and number of seeds/boll. However the GMS based hybrids failed to
exhibit heterosis over better parent for ginning out tum except one cross, as against
three conventional hybrids. The higher ginning out-tum of conventional hybrids was
mainly contributed by their lower seed index values, as large proportion of conventional
hybrids exhibited negative heterosis for seed index. Three GMS based hybrids viz.,
DS-5 x 30802, DS-5xNo.2631 and D5-5 x B-Desh are potential hybrids for exploitation
of hybrid vigour ulilizing 05-5 male sterile line.
 

Keywords: Gossypium arboreum, genetic male sterility, conventional and GMS based hybrids and heterosis

Info

Year: 1999
Volume: 59
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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