Indian Society of Genetics & Plant Breeding

Combining ability and heterosis for disease index of red rot in sugarcane (Saccharum officinarum L.)

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Combining ability and heterosis for disease index of red
rot were studied in the progenies of nine sugarcane
(Saccharum officinarum L.) clones to identify suitable
parents and crosses for further exploitation in breeding
programmes. Based on the combining ability results, Co
8347, ISH-021 and Co 86011 were identified as good
general combiners for imparting red rot resistance. Use
of these clones, with high
(negative) gca effects, would
be advantageous in poly cross method of breeding. The
association between
sca effects and heterosis over
mid-parent indicated that the
sea effects were not so
prominent to cause unidirectional heterosis. Hence,
se performance, sea effects and heterosis were considered
to identify Co 7201 x Co 86011, Co 8347 x Co 1148, Co
89009 x Co 86011 and ISH-021 x Co 1148 as the best
specific combinations for red rot disease index. Both
additive and dominance variances were equally important
and heritability (in narrow sense) was 0.51 for red rot
resistance in sugarcane. High value (0.97) of heritability
(in broad sense) indicated the negligible influence of
environment on red rot disease development in sugarcane

Keywords: Sugarcane, combining ability, red rot, resistance, disease index


Year: 2005
Volume: 65
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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