Effects of Temperature and Genotype on Pollen Tube Growth in Some Self-incompatible and Self-compatible Almond Cultivars1

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Abstract
Pollen tube growth in the styles following self- and cross-pollination was studied in self-incompatible ‘Ne Plus Ultra’ almond (Prunus amgdalus Batsch) and 5 unnamed self-fertile almond selections derived from back-cross hybridization with peach (P. persica (L.) Batsch). Self-incompatibility of ‘Ne Plus Ultra’ was expressed morphologically by failure of all tubes to grow through the style, failure of many tubes to penetrate the style, presence of swollen pollen tube ends and retrogression with time at higher temperatures. Rates of pollen tube growth in self-fertile selections was consistently less than after cross-pollination, but the ratios of self/cross varied. Thus, selections ranged from those approaching selfincompatibility to those approaching self-compatibility. Optimum temperatures for ‘Ne Plus Ultra’ were 15°C when selfed and 25° when crossed. For the self-fertile selections selfed, it was 25° for all but one, which was 15°. When crossed, it was always 25°. One selection showed a high degree of ovule under-development independent of self-compatibility.

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