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Self-incompatibility genotypes in almond re-evaluated by PCR, stylar ribonucleases, sequencing analysis and controlled pollinations

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Abstract

As part of the almond breeding programme at IRTA, we investigated the S genotypes of several cultivars using a combination of RNase zymograms, testcrosses, pollen-tube growth analysis and molecular identification by PCR analysis. For some of the cultivars examined, discrepancies appeared between their S alleles as reported in the literature and those found in this investigation, leading to a re-evaluation of their S genotypes. Analysis of the stylar ribonucleases (RNases), which are known to correlate with S alleles, of cvs. Achaak, Ardechoise, Desmayo Largueta, Ferrastar, Gabaix, Garbí, Glorieta, Languedoc, Primorskiy and Texas revealed inconsistencies with respect to the S5 and S10 alleles. However, PCR with the conserved primer pair AS1II/AmyC5R failed to detect any of these inconsistencies. When the S alleles from Desmayo Largueta, Gabaix, Primorskiy and Texas were sequenced, Texas and Primorskiy were found to carry the reported S5 allele, while Desmayo Largueta and Gabaix carried a new allele, which has been tentatively denoted as S25 This new S allele, previously reported to be S10, was also identified in Achaak, Ardechoise and Ferrastar. The proposed new S genotypes are Achaak (S2S25), Ardechoise (S1S25), Desmayo Largueta (S1S25), Ferrastar (S2S25) and Gabaix (S10S25). The S alleles of Garbí, Glorieta, Languedoc, Texas and Primorskiy remain as reported in the literature. Testcrosses in the field and laboratory confirmed the new S genotypes. One cultivar (Gabaix) could be assigned to the existing cross-incompatibility group O of unique genotypes, and two new groups were established (XVI and XVII) consisting of two cultivars each. The clarification of these S alleles will be useful in almond breeding programmes and for planning new commercial orchards in the future.

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Acknowledgements

The authors are grateful to P. Martínez-Gómez (CEBAS, CSIC, Murcia) and T.M. Gradziel (University of California, Davis, USA) for their valuable comments and suggestions. We also thank J. Clavé, M.A. Romero, J. Santos and J. Vergés (IRTA-Mas Bové), D. Gregory and K. Malone (University of Adelaide, Australia) and members of the laboratory of Genètica Vegetal at IRTA-Cabrils for their help with the field and laboratory work. This research was conducted under two INIA (Spanish Ministry of Education and Science) Projects (SC97-049 and RTA01-081). M.L. gratefully acknowledges a grant from the INIA postgraduate programme.

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Correspondence to Ignasi Batlle.

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Communicated by H.F. Linskens

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López, M., Mnejja, M., Rovira, M. et al. Self-incompatibility genotypes in almond re-evaluated by PCR, stylar ribonucleases, sequencing analysis and controlled pollinations. Theor Appl Genet 109, 954–964 (2004). https://doi.org/10.1007/s00122-004-1656-2

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