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

Cunningham, Natalie and Crestani, Gaia and Csepregi, Kristóf and Coughlan, Neil E. and Jansen, Marcel A. K. (2024) Exploring the complexities of plant UV responses; distinct effects of UV-A and UV-B wavelengths on Arabidopsis rosette morphology. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, 23 (7). pp. 1251-1264. ISSN 1474-905X

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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.

Item Type: Article
Uncontrolled Keywords: UV-A, UV-B, Morphology, Arabidopsis, Acclimation, UVR8
Subjects: Q Science / természettudomány > QD Chemistry / kémia
Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia
Q Science / természettudomány > QK Botany / növénytan
Q Science / természettudomány > QK Botany / növénytan > QK20 Plant morphology. Plant anatomy / növénymorfológia, -anatómia
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 11 Sep 2024 11:45
Last Modified: 11 Sep 2024 11:45
URI: https://real.mtak.hu/id/eprint/204686

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