Nature of sterility in the amphidiploid Alltum cepa-fistulosum

Davis, E.W.

American Journal of Botany 42(1): 41-48


ISSN/ISBN: 0002-9122
Accession: 025055648

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The seed set was less on all the amphi-diploids Allium cepa-fistulosum than on the parental spp. The position of the seed set within the ovary did not affect the number of seeds per fruit. The % of stainable pollen was the same and the manifestations of sterility were similar in the amphidiploid and the parental spp. Fertilization usually occurred from the third to the eighth day after anthesis. A gradual decrease in normal embryos and endosperms occurs from the fifth to the eight day after anthesis. Non-functional embryo sacs were found in two amphidiploid lines. The available genetic evidence does not permit discrimination between three possible explanations as to the cause of sterility in the amphidiploid: (1) complementary genes; (2) genes carried over from either parent, or both parents; (3) change in the genie balance brought about by cumulative action of some genes and non-cumulative action of others by the polyploid condition. Three possible solutions to circumvent the sterility are offered: (1) selection within segregating amphidiploid lines; (2) selection of parental material for absence of genes causing sterility; and (3) crossing of autotetraploids of the two spp. involved in which the parents have been selected for lack of genes causing sterility.