Summary
The pre-and post-fertilization barriers in the interspecific crosses between Vigna umbellata and V. minima were investigated. In the reciprocal crosses (V. minima as the ♂ parent) the entry of pollen tubes into the ovary was delayed by about 4 h, and no seed set was observed. However, no pre-fertilization barriers were encountered in crosses involving V. minima as the ⧫ parent and V. umbellata as the ♂ parent (normal cross). The delay/absence of divisions in the endosperm and the failure of embryo to divide were the post-fertilization barriers responsible for somatoplastic sterility in normal crosses which yielded a few hybrid seeds. The hybrid seeds showed poor germinability. The F1 hybrids were intermediate between the parents in most morphological characters, and are completely sterile for pollen. Backcrossing of F1 hybrid with both the parents did not restore fertility in the progenies. V. minima is considered as the tertiary gene pool of the rice bean.
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Gopinathan, M.C., Babu, C.R. & Shivanna, K.R. Interspecific hybridization between rice bean (Vigna umbellata) and its wild relative (V. minima): Fertility-sterility relationships. Euphytica 35, 1017–1022 (1986). https://doi.org/10.1007/BF00028613
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DOI: https://doi.org/10.1007/BF00028613