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首页> 外文期刊>Journal of Experimental Botany >Elevated temperature drives a shift from selfing to outcrossing in the insect-pollinated legume, faba bean (Vicia faba)
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Elevated temperature drives a shift from selfing to outcrossing in the insect-pollinated legume, faba bean (Vicia faba)

机译：高温驱动昆虫授粉豆类（Vicia Faba）的昆虫授粉

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摘要

Climate change can threaten the reproductive success of plants, both directly, through physiological damage during increasingly extreme weather events, and indirectly, through disruption of plant-pollinator interactions. To explore how plant-pollinator interactions are modified by extreme weather, we exposed faba bean (Vicia faba) plants to elevated temperature for 5 d during flowering, simulating a heatwave. We then moved the plants to flight cages with either bumblebees or no pollinators, or to two field sites, where plants were enclosed in mesh bags or pollinated by wild insect communities. We used a morphological marker to quantify pollen movement between experimental plants. There was a substantial increase in the level of outcrossing by insect pollinators following heat stress. Proportion outcrossed seed increased from 17 % at control temperature, to 33 % following heat stress in the flight cages, and from 31 % to 80 % at one field site, but not at the other (33 % to 32 %). Abiotic stress can dramatically shift the relative contributions of cross-and self-pollination to reproduction in an insect pollinated plant. The resulting increases in gene flow have broad implications for genetic diversity and functioning of ecosystems, and may increase resilience by accelerating the selection of more stress-tolerant genotypes.
机译：气候变化可能会通过在越来越极端的天气事件期间，通过破坏植物 - 传导管相互作用，直接通过生理损害来威胁到植物的生殖成功。为了探讨植物 - 传毒剂相互作用如何通过极端天气修改，在开花期间，将Faba Bean（vicia faba）植物暴露于5 d的温度升高，模拟热浪。然后，我们将植物带到了大黄蜂或没有粉丝群的飞行笼，或者在植物包围植物袋或被野生昆虫社区授粉的田间场地。我们使用了形态学标记来量化实验植物之间的花粉运动。在热应激之后，昆虫传导素突出的折叠水平大幅增加。比例倒置的种子在控制温度下从17％增加到飞行笼中热应激后的33％，在一个场地的31％至80％，但不是另一个（33％至32％）。非生物胁迫可以大大改变昆虫授粉植物中交叉和自授粉对繁殖的相对贡献。由此产生的基因流量的增加对生态系统的遗传多样性和运作具有广泛的影响，并且可以通过加速更应耐压力基因型的选择来增加弹性。

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