High Temperatures during Flowering Reduce Fruit Set in Rabbiteye Blueberry

作者：Qin Yang, Liu Er, Yan Fu, Fuqiang Yuan, Tingting Zhang, Peng Shu · 发表于：Journal of the American Society for Horticultural Science · 年份：2019 · DOI：10.21273/jashs04650-19 · 被引用次数：46 · 研究领域：Horticultural and Viticultural Research、Plant and animal studies、Plant Physiology and Cultivation Studies

After nearly a decade of development, the scale of blueberry ( Vaccinium sp.) cultivation has increased, particularly in south China; however, this region is becoming increasingly challenged by temperature changes during the flowering phenophase. Understanding the effects of temperature on pollen germination and pollen tube growth in blueberry is thus important. Using the rabbiteye blueberry ( V. ashei ) ‘Brightwell’, different temperature treatments were carried out during open pollination and cross-pollination with the pollen from rabbiteye blueberry ‘Gardenblue’ in field, greenhouse, and controlled temperature experiments over two consecutive years. The differences in pollen germination, pollen tube dynamics, and ovule viability following different treatments were analyzed, and the critical temperatures were calculated using quadratic and modified bilinear equations to quantify the developmental responses to temperature. The results showed that the fruit set of the artificially pollinated plants inside the greenhouse was significantly higher than that outside the greenhouse. Furthermore, pollen germination and pollen tube growth gradually accelerated under the appropriate high-temperature range, resulting in reduced pollen tube travel time to the ovule. However, the percentage of the style traversed by the pollen tube did not increase at temperatures greater than 30 °C, and a high-temperature range could accelerate ovule degeneration. Therefore, impairment of pollen tube g...