QUANTITATIVE AND QUALITATIVE EXPRESSION OF SELF-COMPATIBILITY IN ALMOND
The evidence of almond self-pollination over almost a century has shown a high variability of fruit set, ranging from nil, indicating self-incompatibility, to very high, reaching the level of a normal crop and confirming self-compatibility in these genotypes. Most intermediate levels of fruit set were previously noted in the study identifying self-compatibility by Almeida in 1945. However, most attention has been directed towards the qualitative presence of the Sf allele, especially after the development of specific PCR primers allowing easy identification in the lab, and not to this quantitative expression of self-compatibility, as measured in field trials. Recent findings have shown that the presence of the Sf gene is not the exclusive source of self-compatibility in almond; the presence of modifier genes affecting its expression have revived the previous suggestion that almond may be a self-incompatible species with a genetic background of pseudo-self-compatibility, as indicated by the small self set observed in some cultivars. Over this background, a single Sf allele could break the self-incompatible system, but probably several minor genes could act to produce a quantitative expression of self-compatibility within this background of pseudo-self-compatibility in almond.
Socias i Company, R., Fernández i Martí, A., Kodad, O. and Alonso, J.M. (2013). QUANTITATIVE AND QUALITATIVE EXPRESSION OF SELF-COMPATIBILITY IN ALMOND. Acta Hortic. 976, 321-324
Prunus amygdalus Batsch., pollination, quantitative trait