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首页> 外文OA文献 >SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION OF MOUNTAIN AVENS, DRYAS OCTOPETALA L. IN THE HIGH ARCTIC, NY-ÅLESUND, SVALBARD (19th Symposium on Polar Biology)
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SUN-TRACKING FLOWER MOVEMENT AND SEED PRODUCTION OF MOUNTAIN AVENS, DRYAS OCTOPETALA L. IN THE HIGH ARCTIC, NY-ÅLESUND, SVALBARD (19th Symposium on Polar Biology)

机译：在北极高地，纽约 - 奥勒松，sVaLBaRD（第18届极地生物学研讨会）的太阳跟踪花卉运动和种子生产的山峨，薇甘菊

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I observed the sun-tracking behavior, temperature increment within flowers, and seed production of mountain avens, Dry us oclopclala L , occurring near Bragger glacier in Ny-Alesund (78°55u27N, 11°56u27E), Svalbard in Norway. The flowers showed sun-tracking movement on sunny days, but the movement was mostly found around noon and was not so active throughout a sunny day. The temperature increment of the gynoecmm in flowers facing the sun was ca 2℃ higher than in flowers with their back to the sun Petal removal resulted in considerable reduction of the gynoecmm temperature Insects (mostly mosquitoes) visiting flowers were very infrequent, suggesting that a severe pollinator limitation restricted the crosspollination. During the experiments, flowers of Dryas octopetala did not produce any developed seeds under natural condition (0% seed-set) Cross-pollinated flowers showed 8% seed-set, while flowers which were artificially warmed by small green-houses during the flowering period showed 60% seed-set, indicating that the reproduction of D octopetala is strongly restricted by low temperature during the flowering period, rather than by pollinator limitation, in the population of Ny-Ålesund, Svalbard These results suggest that the sun-tracking behavior and parabola-shaped flower structure with large petals are important for seed-setting success by increasing the gynoecmm temperature.
机译：我观察了太阳追踪行为，花朵内的温度升高以及山间大草原的种子生产，Dry us oclopclala L，发生在挪威斯瓦尔巴特群岛Ny-Alesund（78°55 u27N，11°56 u27E）的Bragger冰川附近。花朵在阳光明媚的日子表现出太阳追踪运动，但这种运动主要在中午左右发现，并且在整个晴天都不那么活跃。面对阳光的花朵中，雌雄同体的温度升高比回到阳光下的花朵高约2℃。去除花瓣导致雌雄同体的温度大大降低。访花的昆虫（多数是蚊子）很少见，表明这种昆虫非常严重。授粉媒介的限制限制了异花授粉。在实验过程中，八仙花的花在自然条件下（0％结实）不产生任何发育的种子。异花授粉的花显示8％的结实，而花朵在开花期由小温室人工加热斯瓦尔巴德群岛Ny-lesesund种群中，D。octopetala的结实率达60％，表明其在开花期的繁殖受到低温的强烈限制，而不是受授粉媒介的限制。这些结果表明，太阳跟踪行为和花瓣较大的抛物线形花朵结构通过提高妇科温度，对于成功结实很重要。

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