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Self-incompatibility and self-fruitfulness in pear cv. Agua de Aranjuez

AuthorsSanzol Sanz, Javier; Herrero Romero, María
KeywordsFruit drop
Fruit set
Pollen tube growth
Pyrus communis
Issue Date2007
PublisherAmerican Society for Horticultural Science
CitationJournal of the American Society for Horticultural Science 132(2): pp. 166-171
AbstractMost pear (Pyrus communis L.) cultivars are impaired to set fruit under self-pollination, because self-fertilization is prevented by a gametophytic self-incompatibility system. However, accumulated information in this species shows that often for a same cultivar, after self-pollination, a variable response in fruit set can be obtained in different years or growing conditions. In this work, we characterize self-incompatibility and self-fruitfulness in 'Agua de Aranjuez', the main Spanish pear cultivar, which also shows a variable response to self-pollination. Two years with a different fruit setting response after self-pollination, one with no fruit set and the other with a moderate fruit set, were compared for parthenocarpic fruit development and for pollen tube performance. Results show that in both years, this cultivar behaves as self-incompatible with absence of parthenocarpy. In selfed flowers, most pollen tubes are arrested in the upper half of the style, although in a small proportion of the styles, a pollen tube can reach the base of the style and eventually effect fertilization. Self-fertilization, although occurring at a low level, can explain the fruit set levels obtained under self-pollination given that flowers with just one fertilized ovule are able to set fruit. This behavior could explain confusing results about self-fruitfulness in 'Agua de Aranjuez' and other pear cultivars.
Publisher version (URL)http://journal.ashspublications.org/cgi/content/abstract/132/2/166
Appears in Collections:(EEAD) Artículos
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