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Incompatibility in Abutilon `Hybridum'
K. K. Pandey
American Journal of Botany
Vol. 47, No. 10 (Dec., 1960), pp. 877-883
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2446586
Page Count: 7
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Abutilon `Hybridum' (2n = 16) has a one-locus multiallelic gametophytic (Nicotiana-type) system of self-incompatibility. Five S alleles were distinguished among the 4 plants studied. However, the incompatibility behavior in many crosses is obscured by the modifying effects of a number of other genes non-allelic to the S locus. Since A. `Hybridum' is a cultivar which has arisen through hybridization of 2 or more Abutilon species, it is suggested that the mixed polygenic background of the "species" is not adjusted to the proper functioning of the S gene system. Although most of the plants in the 6 groups studied were highly self-incompatible in the early and mid season, many of them showed pseudo-self-compatibility late in the season. Seed-set in illegitimate crosses also increased late in the season. Colchicine-induced autopolyploidy brought about part or full self-compatibility. After incompatible pollination, pollen germination appeared to be normal but a considerable proportion of the tubes were inhibited in the stigmatic region of the style; tubes which penetrated the style usually burst between 1/5 and 1/3 of the distance from the stigma to the base, a phenomenon not found in any of the other gametophytic-type species yet studied.
American Journal of Botany © 1960 Botanical Society of America, Inc.