BACKGROUND AND AIMS UVB radiation can rapidly induce gene regulation leading to cumulative changes for plant physiology and morphology. We hypothesized that a transgenerational effect of chronic exposure to solar short UV modulates the offspring's responses to UVB and blue light, and that the transgenerational effect is genotype dependent. METHODS We established a factorial experiment combining two Vicia faba L. accessions, two parental UV treatments (full sunlight and exclusion of short UV, 290-350 nm), and four offspring light treatments from the factorial combination of UVB and blue light. The accessions were Aurora from southern Sweden, and ILB938 from Andean region of Colombia and Ecuador. KEY RESULTS The transgenerational effect influenced morphological responses to blue light differently in the two accessions. In Aurora, when UVB was absent, blue light increased shoot dry mass only in plants whose parents were protected from short UV. In ILB938, blue light increased leaf area and shoot dry mass more in plants whose parents were exposed to short UV than those that were not. Moreover, when the offspring was exposed to UVB, the transgenerational effect decreased in ILB938 and disappeared in Aurora. For flavonoids, the transgenerational effect was detected only in Aurora: parental exposure to short UV was associated with a greater induction of total quercetin in response to UVB. Transcript abundance was higher in Aurora than in ILB938 for both CHALCONE SYNTHASE (99-fold) and DON-GLUCOSYLTRANSFERASE 1 (19-fold). CONCLUSIONS The results supported both hypotheses. Solar short UV had transgenerational effects on progeny responses to blue and UVB radiation, and they differed between the accessions. These transgenerational effects could be adaptive by acclimation of slow and cumulative morphological change, and by early build-up of UV protection through flavonoid accumulation on UVB exposure. The differences between the two accessions aligned with their adaptation to contrasting UV environments.

中文翻译：

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来自对比紫外线环境的蚕豆两个种质的太阳短紫外线辐射的跨代效应不同

背景和目的 UVB 辐射可以快速诱导基因调控，导致植物生理学和形态学的累积变化。我们假设长期暴露于太阳短紫外线的跨代效应调节后代对 UVB 和蓝光的反应，并且跨代效应是基因型依赖性的。方法我们建立了一个因子实验，结合了两个蚕豆种质、两个亲本紫外线处理（完全阳光和排除短紫外线，290-350 nm）和四个来自 UVB 和蓝光的因子组合的后代光处理。种质是来自瑞典南部的 Aurora 和来自哥伦比亚和厄瓜多尔安第斯地区的 ILB938。主要结果 在两个种质中，跨代效应对蓝光的形态反应有不同的影响。在极光，当 UVB 不存在时，蓝光只会在亲本受到短紫外线保护的植物中增加茎干质量。在 ILB938 中，与未暴露于短紫外线的植物相比，蓝光在亲本暴露于短紫外线的植物中增加了更多的叶面积和茎干质量。此外，当后代暴露于 UVB 时，ILB938 中的跨代效应减弱，而在 Aurora 中消失。对于黄酮类化合物，仅在 Aurora 中检测到跨代效应：父母暴露于短紫外线与对 UVB 响应的总槲皮素的更大诱导相关。对于 CHALCONE SYNTHASE（99 倍）和 DON-GLUCOSYLTRANSFERASE 1（19 倍），Aurora 中的转录本丰度高于 ILB938。结论 结果支持这两个假设。太阳短紫外线对后代对蓝色和 UVB 辐射的反应具有跨代效应，并且它们在加入之间有所不同。这些跨代效应可以通过适应缓慢和累积的形态变化，以及通过在 UVB 暴露时积累类黄酮来早期建立紫外线保护来适应。两个种质之间的差异与其对对比鲜明的紫外线环境的适应一致。