Exploring the complexities of plant UV responses; distinct effects of UV-A and UV-B wavelengths on Arabidopsis rosette morphology.

IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Photochemical & Photobiological Sciences Pub Date : 2024-07-01 Epub Date: 2024-05-12 DOI:10.1007/s43630-024-00591-w
Natalie Cunningham, Gaia Crestani, Kristóf Csepregi, Neil E Coughlan, Marcel A K Jansen
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Abstract

UV-B radiation can substantially impact plant growth. To study UV-B effects, broadband UV-B tubes are commonly used. Apart from UV-B, such tubes also emit UV-A wavelengths. This study aimed to distinguish effects of different UV-B intensities on Arabidopsis thaliana wildtype and UVR8 mutant rosette morphology, from those by accompanying UV-A. UV-A promotes leaf-blade expansion along the proximal-distal, but not the medio-lateral, axis. Consequent increases in blade length: width ratio are associated with increased light capture. However, petiole length is not affected by UV-A exposure. This scenario is distinct from the shade avoidance driven by low red to far-red ratios, whereby leaf blade elongation is impeded but petiole elongation is promoted. Thus, the UV-A mediated elongation response is phenotypically distinct from classical shade avoidance. UV-B exerts inhibitory effects on petiole length, blade length and leaf area, and these effects are mediated by UVR8. Thus, UV-B antagonises aspects of both UV-A mediated elongation and classical shade avoidance. Indeed, this study shows that accompanying UV-A wavelengths can mask effects of UV-B. This may lead to potential underestimates of the magnitude of the UV-B induced morphological response using broadband UV-B tubes.

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探索植物紫外线反应的复杂性;UV-A 和 UV-B 波长对拟南芥莲座形态的不同影响。
紫外线-B 辐射会对植物生长产生重大影响。为了研究紫外线-B 的影响,通常使用宽带紫外线-B 管。除紫外线-B 外,这类紫外辐射管还能发射紫外线-A 波长。本研究旨在区分不同紫外线-B强度对拟南芥野生型和 UVR8 突变体莲座丛形态的影响,以及伴随紫外线-A的影响。UV-A 促进叶片沿近端-远端轴扩展,而不是沿中间-外侧轴扩展。叶片长宽比的相应增加与光捕获的增加有关。然而,叶柄长度不受紫外线照射的影响。这种情况有别于由低红远红比驱动的避阴现象,后者阻碍了叶片的伸长,但促进了叶柄的伸长。因此,紫外线-A 介导的伸长反应在表型上有别于传统的避荫反应。紫外线-B 对叶柄长度、叶片长度和叶面积都有抑制作用,这些作用是由 UVR8 介导的。因此,UV-B 可拮抗 UV-A 介导的伸长和典型的避荫。事实上,这项研究表明,伴随的 UV-A 波长会掩盖 UV-B 的影响。这可能会导致使用宽带紫外线-B 管时低估紫外线-B 诱导的形态反应的程度。
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来源期刊
Photochemical & Photobiological Sciences
Photochemical & Photobiological Sciences 生物-生化与分子生物学
CiteScore
5.60
自引率
6.50%
发文量
201
审稿时长
2.3 months
期刊介绍: A society-owned journal publishing high quality research on all aspects of photochemistry and photobiology.
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