Ultraviolet-B radiation induces complex alterations in stomatal behaviour
Ultraviolet-B radiation induces complex alterations in stomatal behaviour
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DOI：
10.1034/j.1399-3054.2000.110207.x
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发表时间：
2000-10-01
影响因子：
6.4
通讯作者：
van den Noort, RE
中科院分区：
文献类型：
--
作者：
Jansen, MAK;van den Noort, RE
可见光和紫外光在控制气孔开度方面都起着重要的作用。本文分析了UV-B辐射对蚕豆气孔开度的影响，发现其影响是复杂的。根据保卫细胞的代谢状态，高通量的UV-B刺激气孔开放或气孔关闭。这些反应都不容易逆转，即一旦气孔暴露于UV-B，它们就不能重新调整其孔径以响应环境刺激，如光、湿度或阿坝的变化。这种缺乏反应是不太可能是由于广泛的细胞损伤，紫外线诱导的气孔关闭在很大程度上恢复响应H+-ATP酶激活剂fusicoccin。据推测，UV-B的影响上游质膜酶复合物，促进溶质通量导致气孔开放。我们的数据可能有助于容纳看似矛盾的报告，UV-B对气孔孔径和/或电导的影响。
Both visible and UV wavelengths play an important role in controlling stomatal aperture. We have analysed effects of UV-B radiation on stomatal aperture in Vicia faba, and found them to be complex. Depending on the metabolic state of the guard cell, high fluences of UV-B either stimulate stomatal opening or stomatal closing. Neither of these responses is readily reversed, i.e. once stomata have been exposed to UV-B, they are unable to re-adjust their aperture in response to environmental stimuli like changes in light, humidity or ABA. This lack of responsiveness is unlikely to be due to widespread cellular damage, as UV-induced stomatal closure is largely reverted in response to the H+-ATPase activator fusicoccin. It is speculated that UV-B impacts upstream from the plasmalemma based enzyme complexes which facilitate the solute fluxes leading to stomatal opening. Our data may help accommodate seemingly contradictory reports on the effects of UV-B on stomatal aperture and/or conductance.