Self-compatibility and autogamy in ‘Guara’ almond

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Abstract
To evaluate self-compatibility and autogamy in ‘Guara’ almond, pollen tube growth and fruit set following hand pollination and fruit set in a caged tree were considered. Pollen tube growth after self- and cross-pollination was similar either at 15 or 20°C. Fruit set after hand pollination was almost identical for both self- and cross-pollination either in the open field or on the caged tree. Thus the ability of the own pollen to grow and to set fruit was assessed, showing its genetical self-compatibility. Natural fruit set in the caged tree was over 11%, which is low for a commercial crop, but it was compensated by the high bloom density of this cultivar. This set was also probably decreased by the cage environment and the lack of wind inside the cage, showing that there is natural autogamy, as seen by the position of the stigma among the anthers, allowing natural self-pollination.

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