Temperature-driven flower longevity in a high-alpine species of Oxalis influences reproductive assurance
Temperature-driven flower longevity in a high-alpine species of Oxalis influences reproductive assurance
复制标题
DOI：
10.1111/nph.12443
复制
发表时间：
2013-12-01
期刊：
影响因子：
9.4
通讯作者：
Cavieres, Lohengrin A.
中科院分区：
文献类型：
--
作者：
Arroyo, Mary T. K.;Dudley, Leah S.;Cavieres, Lohengrin A.
高山植物如何面对动物授粉的随机条件是一个关键问题。在海拔3470 m的高原上，采用开放式温室（OTCs）对不授粉和人工授粉的紫叶酢浆草（Oxalisacutta）进行了温度处理，研究了温度对紫叶酢浆草花潜在寿命（FL）和实际寿命的影响，并探讨了在低温条件下延长潜在寿命是否能改善紫叶酢浆草花的缓慢授粉。在海拔3100至3470 m之间的六个高山地点测量了花的特定温度以及排除传粉者和自由授粉的花寿命。坐果进行了分析，推断的授粉时间。变暖减少潜在的FL。整个高山景观预测潜在的和实际的FL可变的热条件下，花衰老授粉调节。实际FL和潜在FL耦合。在较冷的条件下，延长的潜在FL通常增加座果。在较冷的温度下，花粉囊保持开放的时间更长，从而改善缓慢的授粉，并在温暖的条件下，当授粉往往更快时，关闭得更早。塑料潜在FL提供了适应性优势，在寒冷，热变化的高山栖息地，并在一个温暖的世界中，高山植物的繁殖成功具有重要意义。
How high-alpine plants confront stochastic conditions for animal pollination is a critical question. We investigated the effect of temperature on potential flower longevity (FL) measured in pollinator-excluded flowers and actual FL measured in pollinated flowers in self-incompatible Oxalis compacta and evaluated if plastically prolonged potential FL can ameliorate slow pollination under cool conditions.Pollinator-excluded and hand-pollinated flowers were experimentally warmed with open-top chambers (OTCs) on a site at 3470m above sea level (asl). Flower-specific temperatures, and pollinator-excluded and open-pollination flower life-spans were measured at six alpine sites between 3100 and 3470m asl. Fruit set was analyzed in relation to inferred pollination time.Warming reduced potential FL. Variable thermal conditions across the alpine landscape predicted potential and actual FL; flower senescence was pollination-regulated. Actual FL and potential FL were coupled. Prolonged potential FL generally increased fruit set under cooler conditions.Plastic responses permit virgin flowers of O. compacta to remain open longer under cooler temperatures, thereby ameliorating slow pollination, and to close earlier when pollination tends to be faster under warmer conditions. Plastic potential FL provides adaptive advantages in the cold, thermally variable alpine habitat, and has important implications for reproductive success in alpine plants in a warming world.