Cajanus platycarpus (Benth.) Maesen as the donor of new pigeonpea cytoplasmic male sterile (CMS) system |
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Authors: | Nalini Mallikarjuna Deepak R Jadhav Sandhya Srikanth and Kulbhushan B Saxena |
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Institution: | (1) International Crops Research Institute for Semi Arid Tropics, Patancheru, 502 324, Andhra Pradesh, India |
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Abstract: | Cajanus platycarpus, a distantly related wild species, was successfully crossed with cultivated pigeonpea using embryo rescue and tissue culture
techniques. Advance generation lines showed a range of desirable characters including cytoplasmic male sterility. A range
of pigeonpea cultivars restored fertility and was maintained by a few lines including cultivar ICPL 85010. Clasmogamous flowers
were observed in the male sterile lines. In such flowers anthers did not form di-adlephous bundle. Cytological analysis revealed
that meiosis proceeded normally till the tetrad stage in those anthers with pollen grains. After which many of the pollen
grains turned sterile. In the anthers with pollen grains, dehiscence was not observed, thus creating functional sterility.
In many other anthers, pollen mother cells (PMCs) were not formed at all, giving rise to sepalous anthers. In conclusion two
mechanisms of male sterility existed, one was premeiotic, where PMCs did not form and in the second, although PMCs gave rise
to pollen grains, they were either partially or totally sterile accompanied by non-dehiscence of anther wall. |
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