Seasonal variation in air temperature drives reproductive phenology of entomophilous plants in a cool-temperate mire community.
Seasonal variation in air temperature drives reproductive phenology of entomophilous plants in a cool-temperate mire community.
复制标题
气温的季节性变化驱动着冷温带沼泽群落中昆虫植物的繁殖物候。
作者：
Ida TY;Kudo G
由于气候变化的持续挑战，植物对温度动态的物候反应受到关注。以往的物候学研究大多集中在开花物候学而不是结果物候学。然而，在中纬度地区，在植物生长期间，气温会周期性地变化。因此，在生长期的早期和晚期，凉爽的温度可能会通过授粉和果实发育过程影响生殖成功。为了评估生殖物候和成功之间的联系，我们比较了物候，光合能力，并在日本北方冷温带社区25种坐果率。个别品种开花期的环境温度随着开花开始时间的延迟而增加，而果实发育期的环境温度最高的品种在7月开花。种间坐果率与生殖期环境温度和光合能力呈正相关。早开花物种的果实产量受到开花期间凉爽温度的限制，可能是因为传粉者活动低，而晚开花物种的果实产量受到果实发育期间凉爽温度的限制，因为果实发育缓慢（即，汇限制）。因此，水果生产的限制因素不同，取决于开花物候期的个别物种在一个社区。
Phenological responses of plants to temperature dynamics are receiving attention due to the ongoing challenge with climate change. Most previous phenological studies have focused on flowering phenology rather than fruiting phenology. However, at mid-latitudes, the air temperature periodically changes during the growing period of plants. Hence, cool temperatures early and late in the growing period may affect reproductive success through pollination and fruit-development processes. To evaluate the linkages between reproductive phenology and success, we compared the phenologies, photosynthetic capacities, and fruit-set rates among 25 species within a cool-temperate community in northern Japan. The ambient temperature during the flowering periods of individual species increased with delays in flowering-onset time, whereas the ambient temperature during fruit-development periods was highest for species which bloomed in July. Fruit-set success among species was positively correlated with the ambient temperatures during the reproductive periods and with the photosynthetic capacity. Fruit production of early blooming species was limited by cool temperatures during the flowering period, presumably because of low pollinator activity, whereas that of late-blooming species was limited by cool temperatures during the fruit-development period because of slow fruit-development (i.e., sink limitation). Thus, limiting factors of fruit production varied depending on the flowering phenology of individual species within a community.