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Ovular Tumors Connected with Incompatible Crosses in Datura

S. Satina, J. Rappaport and A. F. Blakeslee
American Journal of Botany
Vol. 37, No. 8 (Oct., 1950), pp. 576-586
Stable URL: http://www.jstor.org/stable/2437868
Page Count: 11
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Ovular Tumors Connected with Incompatible Crosses in Datura
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Abstract

The formation of ovular tumors in fertilized ovules prevents hybridization in incompatible species crosses of Datura. The multiplication of cells of the endothelium results in the formation of inwardgrowing tumoral tissue which absorbs the contents of the embryo sac. The growth of tumors stops after the cell contents of the endosperm and of the embryo are absorbed. No outward growth of the tumors has been observed. The speed and intensity of growth of tumors depend on several factors such as species and races used in the crosses. Large swollen seeds with a jelly-like substance but without tumors may also be present. The endothelium in such seeds is destroyed as well as the contents of the embryo sac. Seeds from self-pollination show a decreased amount of starch and an increased amount of fat and aleurone grains during the development of the embryo. The reverse situation is found in incompatible crosses. The following attempts failed to prevent the abortion of embryos in ovules of interspecific Datura crosses: (a) treatment of ovaries with pollen extracts, (b) treatment of the pollen with vapors and solutions of auxins, (c) treatment of the ovaries with extracts of styles and ovaries of selfed Daturas, (d) injection into the ovaries of different hormones and vitamin mixtures, different enzymes and nutrient media, (e) spraying leaves with sugar solutions containing enzymes, (f) injection and spraying of malt extracts. Tumoral tissues and embryo-sac contents from incompatible Datura crosses, when added to semi-synthetic cultures of normal D. stramonium embryos, appear to have an inhibiting effect on embryo growth. The inhibition varies from 52-100 per cent, the latter causing death of embryo.

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