7678769888

Материал из Антэкология /// Anthecology
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СТАТЬЯ
The Genetics and Evolution of Gynodioecy
Evolution, . V. 10. No. 2. P. 115125 (11).
1. Gynodioecy-interbreeding hermaphrodites and females-is an outbreeding mechanism which differs from other systems in that the two mating types contribute unequal numbers of genes to the next generation. 2. Origanum vulgare has a gydodioecious system which is controlled by the segregation of two independent genes. The dominant gene F causes anther abortion and the gene H is a dominant suppressor of F. Females are therefore Ffhh or FFhh, hermaphrodites are FfHh, FfHH, ffHh or FFHH. 3. The bottom recessive ffhh has not been found and is presumed to be lethal. The HH genotype arises in the proportion of one-quarter of the expected, and this genotype is self-incompatible. 4. The lethality and reduced production of these genotypes together with a lower seed output of the hermaphrodite are factors of importance in the maintenance of the two types in nature. 5. The genetic control in all its details supports a hypothesis that gynodioecy in Origanum has evolved from an incompatibility system with sporophytic pollen control and inhibition of fertilization in the embryo-sac.
The Genetics and Evolution of Gynodioecy
Lewis D., Crowe L.K.
Evolution, 1956. V. 10. No. 2. P. 115–125 (11).
1. Gynodioecy-interbreeding hermaphrodites and females-is an outbreeding mechanism which differs from other systems in that the two mating types contribute unequal numbers of genes to the next generation. 2. Origanum vulgare has a gydodioecious system which is controlled by the segregation of two independent genes. The dominant gene F causes anther abortion and the gene H is a dominant suppressor of F. Females are therefore Ffhh or FFhh, hermaphrodites are FfHh, FfHH, ffHh or FFHH. 3. The bottom recessive ffhh has not been found and is presumed to be lethal. The HH genotype arises in the proportion of one-quarter of the expected, and this genotype is self-incompatible. 4. The lethality and reduced production of these genotypes together with a lower seed output of the hermaphrodite are factors of importance in the maintenance of the two types in nature. 5. The genetic control in all its details supports a hypothesis that gynodioecy in Origanum has evolved from an incompatibility system with sporophytic pollen control and inhibition of fertilization in the embryo-sac.
AID: 7678769888
DOI: 10.2307/2405887
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