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Effect of pollination time on fruit set in an autogamous almond cultivar

Summary The effective pollination period (EPP) was determined over 2 years for ‘Guara’, an autogamous almond [Prunus amygdalus Batsch syn. P. dulcis (Mill.) D.A. Webb] cultivar, in order to understand the influence of pollination time on its irregular fruit set. Stigma receptivity, pollen retention, and pollen-tube growth were assessed after self-pollination at different time-intervals following bud emasculation. In general, fruit set, the percentage of pistils with pollen grains and with pollen tubes at the style base, and the mean number of pollen tubes, had maximum values on day-2 after emasculation, which corresponded to anthesis. Warmer temperatures during the study in 2006 probably reduced fruit set.These results emphasise the importance of early pollination of flowers, as well as adaptation to higher temperatures during bloom in an autogamous almond cultivar.