Indian Society of Genetics & Plant Breeding

Male-sterility inducing cytoplasmic effects on combining ability in sorghum [Sorghum bicolor (L.) Moench]

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An investigation was carried out to assess the efficiency
of A2 CMS system in comparison to the widely used A1
cytoplasm in sorghum for use in hybrid breeding programs
at International Crops Research Institute for the Semi-Arid
Tropics, Patancheru, Andhra Pradesh, India during 2002
and 2003 post rainy seasons. Significant cytoplasm effects
on gca effects of A-lines and on mean performance and
sca effects of hybrids were detected in only some of the
nuclear genetic backgrounds and where detected, the
magnitude of effects varied with the trait and was minimal
to have any practical significance for any of the traits. The
mean days to 50% flowering, plant height and grain yield
of A2 cytoplasm-based hybrids were comparable with
those of widely used A1 cytoplasm-based hybrids. The
implications of these results are discussed in relation to
opportunities for broadening cytoplasm as well as nuclear
genetic base of sorghum hybrid parents.

Keywords: Sorghum, cytoplasmic-nuclear malesterility, iso-nuclear, alloplasmic and combining ability


Year: 2009
Volume: 69
Issue: 3
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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