Leaf Photosynthetic and Photoprotective Acclimation in the Ultraviolet-A1 and Blue Light Regions Follow a Continuous, Shallow Gradient.

IF 6 1区 生物学 Q1 PLANT SCIENCES Plant, Cell & Environment Pub Date : 2024-11-04 DOI:10.1111/pce.15256
Xuguang Sun, Elias Kaiser, Leo F M Marcelis, Tao Li
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Abstract

Although blue light is known to produce leaves with high photosynthetic capacity, the role of the blue-adjacent UV-A1 (350-400 nm) in driving leaf photosynthetic acclimation is less studied. Tomato plants were grown under hybrid red and blue (RB; 95/5 μmol m-2 s-1), as well as four treatments in which RB was supplemented with 50 μmol m-2 s-1 peaking at 365, 385, 410 and 450 nm, respectively. Acclimation to 365-450 nm led to a shallow gradient increase in trait values (i.e., photosynthetic capacity, pigmentation and dry mass content) as the peak wavelength increased. Furthermore, both UV-A1 and blue light grown leaves showed efficient photoprotection under high light intensity. When treated plants were transferred to fluctuating light for 5 days, leaves from all treatments showed increases in photosynthetic capacity, which were strongest in RB, followed by additional UV-A1 treatments; RB grown leaves showed reductions in maximum quantum yield of photosystem II, while UV-A1 grown leaves showed increases. We conclude that both UV-A1 and blue light effectively trigger photosynthetic and photoprotective acclimation, the extent of acclimation becoming stronger the longer the peak wavelength is. Acclimatory responses to UV-A1 and blue light are thus not distinct from one another, but follow a continuous gradient.

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紫外线-A1 和蓝光区域的叶片光合作用和光保护适应性呈现连续的浅梯度。
虽然众所周知蓝光能使叶片具有较高的光合能力,但对邻近蓝光的紫外线-A1(350-400 nm)在推动叶片光合适应方面的作用研究较少。番茄植株在红蓝混合(RB;95/5 μmol m-2 s-1)以及四种处理条件下生长,在这四种处理条件下,RB 分别补充 50 μmol m-2 s-1 峰值为 365、385、410 和 450 纳米的紫外线。适应 365-450 纳米波长后,随着峰值波长的增加,性状值(即光合能力、色素沉积和干物质含量)呈浅梯度增加。此外,在高光照强度下,UV-A1 和蓝光下生长的叶片都表现出高效的光保护作用。将处理过的植物转移到波动光下 5 天后,所有处理的叶片都显示出光合作用能力的提高,其中 RB 处理的光合作用能力最强,其次是 UV-A1 处理;RB 生长的叶片显示出光合系统 II 最大量子产率的降低,而 UV-A1 生长的叶片则显示出光合作用能力的提高。我们的结论是,UV-A1 和蓝光都能有效地引发光合作用和光保护适应,峰值波长越长,适应程度越强。因此,对紫外线-A1 和蓝光的适应性反应并不是相互独立的,而是遵循一个连续的梯度。
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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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