Effect of Temperature before and after Pollination on Pollen Function in ‘Chanee’ Durian

Abstract

Ambient temperature at anthesis is important for pollen germination and pollen tube elongation. In this experiment, the effect of ambient temperature (15, 20, 25, and 30℃) at flowering (1600 to 1900 hours) on subsequent pollen germination was analyzed in‘Chanee’and‘Monthong’durian. The effect of ambient temperature (15, 20, 25, and 30℃) after pollination on pollen tube elongation was also examined in‘Chanee’at 12, 24 and 48 hours after pollination. Low temperatures during anther dehiscence decreased pollen germination in both cultivars; however, the rate was higher in‘Chanee’(27―63％) than‘Monthong’(4―37％) under all temperature conditions. Pollen tube length was significantly shorter in‘Chanee’at 15℃ 12 hours after pollination (12％ the length of the pistil); however, elongation did not differ from that under other temperature conditions at 20℃ (57―63％). These findings suggest the effectiveness of‘Chanee’pollen under low temperatures from flowering through fertilization.