No. 17 (2005): Special Issue
Articles

How does the S-locus determining self-incompatibility in stone fruits work in self-compatible peach?

Published September 14, 2005
Attila Hegedűs
Budapesti Corvinus Egyetem, Alkalmazott Kémia Tanszék, Budapest
Júlia Halász
Budapesti Corvinus Egyetem, Genetika és Növénynemesítés Tanszék, Budapest
Zoltán Szabó
Debreceni Egyetem, Agrártudományi Centrum, Szaktanácsadási és Fejlesztési Intézet, Debrecen
József Nyéki
Debreceni Egyetem, Agrártudományi Centrum, Szaktanácsadási és Fejlesztési Intézet, Debrecen
Andrzej Pedryc
Budapesti Corvinus Egyetem, Genetika és Növénynemesítés Tanszék, Budapest
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APA

Hegedűs, A., Halász, J., Szabó, Z., Nyéki, J., & Pedryc, A. (2005). How does the S-locus determining self-incompatibility in stone fruits work in self-compatible peach?. Acta Agraria Debreceniensis, (17), 93–100. https://doi.org/10.34101/actaagrar/17/3277

The majority of stone fruit species are self-incompatible, a feature that is determined by a specific recognition mechanism between the S-ribonuclease enzymes residing in the pistils and the F-box proteins expressed in the pollen tubes. Failure in the function of any component of this bipartite system resulted in self-compatibility (SC) in many cultivars of Prunus species. Peach (Prunus persica (L.) Batsch.) is the only species in the Prunoideae subfamily that is traditionally known to be self-compatible, but its molecular background is completely unknown. Isoelectric focusing and S-gene specific PCR revealed that SC is not due to functional inability of pistil ribonucleases. We hypothesize that SC may be a consequence of a kind of pollen-part mutation or the action of one or more currently unknown modifier gene(s). Only two S-alleles were identified in a set of peach genotypes of various origin and phenotypes in contrast to the 17–30 alleles described in self-incompatible fruit trees. Most important commercial cultivars carry the same S-allele and are in a homozygote state. This indicates the common origin of these cultivars and also the consequence of self-fertilization. According to the available information, this is the first report to elucidate the role of S-locus in the fertilization process of peach. 

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