Indian Society of Genetics & Plant Breeding


Performance of A1, A2, A3, A4(M), A4(G) and A4(VZM) cytoplasms based iso-nuclear sorghum hybrids for shoot fly resistance across-rainy and post-rainy seasons

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Breeding for resistance to sorghum shoot fly in A1 CMS
system has been only partially successful. To compare the
alternate Cytoplasmic Male Sterility (CMS) systems for
shoot fly resistance, 72 hybrids produced by crossing 36
A-lines carrying six diverse cytoplasms namely, A1, A2, A3,
A4(M), A4(G), A4(VZM), each in six nuclear backgrounds with
two common fertility restorers. The hybrids were evaluated
during 2006 and 2007 rainy and post rainy seasons in shoot
fly screening trials at ICRISAT. ANOVA indicated absence
of overall cytoplasmic influence on dead hearts%. The
general (GCA) and specific combining ability (SCA)
estimates suggested that inheritance for deadhearts was
governed by additive-type of gene action. For GCA effects,
the A2 and A4(M) cytoplasms and for SCA effects, the A4(G)
and A4(M) cytoplasms were superior over other cytoplasms.
Overall, the A4(M) cytoplasm seemed to contribute to shoot
fly resistance in hybrid combinations. However, use of all
the six alternate cytoplasms should not increase the risk of
shoot fly in commercial grain production.

Keywords: Sorghum, shoot fly, resistance, hybrid, combining ability, heterosis


Year: 2015
Volume: 75
Issue: 3
Article DOI: 10.5958/0975-6906.2015.00051.6
Print ISSN: 0019-5200
Online ISSN: 0975-6906


B. V. S. Reddy, A. Ashok Kumar and H. C. Sharma info_circle

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