, Volume 154, Issue 1–2, pp 153–164 | Cite as

Combining ability and heterosis as influenced by male-sterility inducing cytoplasms in sorghum [Sorghum bicolor (L.) Moench]

  • Belum V. S. ReddyEmail author
  • S. Ramesh
  • P. Sanjana Reddy
  • B. Ramaiah


An investigation was carried out to assess the efficiency of A2 cytoplasmic-nuclear male-sterility (CMS) system in comparison to the widely used A1 cytoplasm in terms of general combining ability (gca) effects of male-sterile (A-) lines and mean performance, specific combining ability (sca) effects and mid-parent heterosis of hybrids for days to 50% flowering, plant height and grain yield at International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India in 2001 and 2002 rainy seasons. The material for the study consisted of six pairs of iso-nuclear, allo-plasmic (A1 and A2) A-lines and 36 iso-nuclear hybrids produced by crossing these A-lines with three dual restorer (R-) lines. The results revealed that cytoplasm and its first-order interaction with year, R- and A-lines did not appear to contribute to variation in iso-nuclear hybrids for plant height and grain yield. Cytoplasm had limited effect on gca effects of A-lines and on sca effects and mid-parent heterosis of iso-nuclear hybrids for days to 50% flowering, plant height and grain yield. 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 relative frequency of the occurrence of the A1- and A2-based hybrids with significant sca effects and mid-parent heterosis indicated that A2 CMS system is as efficient as A1 with a slight edge over A1 for commercial exploitation. The implications of these results are discussed in relation to opportunities for broadening not only cytoplasm base but also nuclear genetic base of both the hybrid parents.


Sorghum Cytoplasmic-nuclear male-sterility Iso-nuclear Allo-plasmic Combining ability Heterosis 



Generous financial grants from ICRISAT-Private Sector Sorghum Hybrids Parents Research Consortium and Sehgal Family Foundation for partial support for conducting this research is greatly acknowledged. We also acknowledge the assistance of Ms Rupa, Scientific Officer, for statistical analysis of the experimental data.


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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Belum V. S. Reddy
    • 1
    Email author
  • S. Ramesh
    • 1
  • P. Sanjana Reddy
    • 1
  • B. Ramaiah
    • 1
  1. 1.Global Theme on Crop ImprovementInternational Crops Research Institute for the Semi-Arid Tropics (ICRISAT)PatancheruIndia

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