Influence of High Temperature on Pollen Grain Viability and Pollen Tube Growth in the Styles of Phaseolus vulgaris L.1

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Abstract
Four cultivars of Phaseolus vulgaris L. were studied in a growth chamber experiment to determine the effect of high temperature stress on pollen viability and pollen tube growth in styles. Compared with an optimal growing temperature (25/20°C, day/night), stress temperatures (35/20°, day/night or 35° constant) reduced the percentage of viable pollen for all cultivars, but cultivar differences were apparent. Beans generally produced only small quantities of pollen under normal growing temperatures but much more under high temperatures, again with cultivar differences. Finally, stress temperatures did not reduce the ability of pollen tubes to grow to the base of the style. Our results suggest that injury to pollen at high temperatures up to 35° is not likely to hinder the ability of beans to set pods.

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