PREFERENTIAL TRANSMISSION AND SOMATIC ELIMINATION OF A GOSSYPIUM-STURTIANUM CHROMOSOME IN G-HIRSUTUM
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Previous analyses of 10 monosomic addition stocks of Gossypium hirsutum L. with single chromosomes from G. sturtianum Willis revealed that six of the monosomic addition stocks harbored the same alien chromosome, designated C1-A. The other four monosomic addition stocks harbored three other alien chromosomes, designated C1-B, C1-C, and C1-D. Such disproportionate recovery of C1-A suggested that it might undergo preferential transmission in a G. hirsutum background. Herein we report data that further describe the sexual and vegetative transmission of the four types of alien chromosomes. The alien chromosome C1-A was transmitted through the female gamete to more than 90% of all progenies, whereas the other monosomics averaged only 23% transmission. None of the four alien chromosomes was transmitted via male gametes. Transmission of C1-A through female gametes varied among bolls from 0 to 100%. Chimeral sectors lacking the alien chromosomes were detected in nearly 10% of C1-A monosomic addition stocks that had been ratooned, but not in the other three types of monosomoic addition stocks. The chimerism indicated that the C1-A monosome sometimes undergoes somatic elimination and leads to absence of its transmission in some bolls. The data do not exclude the possibility that C1-A is transmitted to 100% of the progenies derived from C, -A monosomic addition megasporocytes. Possible mechanisms for preferential transmission and somatic elimination are discussed. 1991 The American Genetic Association.
