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Published on August 18, 2006; 10.1104/pp.106.083865

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Received May 19, 2006
Accepted August 4, 2006

Self-compatibility of two Prunus armeniaca selections is associated with two pollen-part mutations of different nature

Santiago Vilanova , María Luisa Badenes , Lorenzo Burgos , José Martínez-Calvo , Gerardo Llácer , and Carlos Romero *

Instituto Valenciano de Investigaciones Agrarias (IVIA). Ctra. Moncada-Náquera Km 5,5. 46113 Moncada (Valencia) Spain
Departamento de Mejora de Frutales. CEBAS-CSIC, Apartado 164, 30100 (Murcia) Spain

* Corresponding author; email: cromero{at}ivia.es.

Loss of pollen-S function in Prunus self-compatible mutants has recently been associated with deletions or insertions in S-haplotype-specific F-box (SFB) genes. We have studied two self-compatible cultivars of apricot (Prunus armeniaca L.), ‘Currot’ (SCSC) and ‘Canino’ (S2SC), sharing the naturally occurring SC-haplotype. Sequence analysis showed that, whereas the SC-RNase is unaltered, a 358 bp insertion is found in the SFBC gene resulting in the expression of a truncated protein. The alteration of this gene is associated with self-incompatibility breakdown supporting previous evidence that point to SFB being the pollen-S gene of the Prunus self-incompatibility (S) locus. On the other hand, PCR-analysis of progenies derived from ‘Canino’ showed that pollen grains carrying the S2-haplotype were also able to overcome the incompatibility barrier. However, alterations in the SFB2 gene or evidence of pollen-S duplications were not detected. A new class of F-box genes encoding a previously uncharacterized protein with high sequence similarity (~62%) to Prunus SFB proteins was identified in this work but the available data rules them out of producing S-heteroallelic pollen and thus the cause of the pollen part mutation. These results suggest that the ‘Canino’ cultivar has an additional mutation, not linked to the S locus, that causes a loss of pollen-S activity when present in pollen. As a whole these findings support the proposal that the S-locus products besides other S-locus independent factors are required for gametophytic self-incompatibility in Prunus.




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[Abstract] [Full Text] [PDF]


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