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Journal of Heredity Advance Access published online on July 24, 2008
Journal of Heredity, doi:10.1093/jhered/esn056
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief communication

Cytogenetic Studies in A4 Cytoplasmic-Nuclear Male-Sterility System of Pigeonpea

Vijay A. Dalvi, Kul B. Saxena, Indradas A. Madrap, and Vijay K. Ravikoti

Pigeonpea Breeding, International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India

Address correspondence to Vijay A. Dalvi, Guangxi Crop Genetic Improvement and Biotechnology Laboratory, Guangxi Academy of Agricultural Sciences, 174 East Daxue Road, Nanning 530007, People's Republic of China, or e-mail: vijay_dalvi79{at}rediffmail.com.

Efforts were made to study microsporogenesis and genetics of fertility restoration of A4 cytoplasmic-nuclear male-sterility (CMS) system in pigeonpea. The process of microsporogenesis in the male-sterile (ICPA 2039) and its maintainer (ICPB 2039) plants was normal up to the tetrad formation stage. The tapetal cells in the male-sterile anthers degenerated soon after tetrad formation, resulting in shriveled and degenerated microspores. In the maintainer plants, the tapetal cells were normal and microspores were functional. The breakdown of the tapetum before the completion of microsporogenesis was the major cause for the expression of male sterility in A4 CMS system. The studies on the inheritance of fertility restoration showed that in 3 crosses, a single dominant gene; in 1 cross, 2 duplicate genes; and in another cross, 2 complimentary genes governed the fertility restoration.

Key Words: CMS • genetics • histology • pigeonpea • tapetum

Corresponding Editor: Reid Palmer

Received January 3, 2008
Accepted June 11, 2008


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