Origin of haploids and semigamy in Theobroma cacao L
The origin of haploid plants of cacao was studied using morphological and enzyme markers. Analysis of 250 haploids arising either from controlled-crosses or from open pollination in a biclonal see-garden showed the existence of several types. They could be either female or male in origin, or chimaeric haploids or diploid/haploid chimaeras. In the majority of cases these chimaeras, visible at the cotyledon stage, were not maintained at the level of foliage, where only one genotype was observed. Studies of the haploid/diploid chimaeras show that the diploid part could be heterozygous and thus correspond to the fusion of the two parental gametes occurring after gametic cell divisions have produced haploid tissue. This phenomenon of semigamy could be facilitated in cacao by its particular systems of self-incompatibility
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| Format: | biblioteca |
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1988
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| Subjects: | HAPLOIDIA, THEOBROMA CACAO, SEMIGAMIA, MARCADORES GENETICOS, QUIMERA, CRUZAMIENTO, DESARROLLO EMBRIONARIO, |
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