Photosystem rearrangements, photosynthetic efficiency, and plant growth in far red-enriched light.

IF 6.2 1区 生物学 Q1 PLANT SCIENCES The Plant Journal Pub Date : 2024-11-07 DOI:10.1111/tpj.17127
Maïté Leschevin, Brigitte Ksas, Raymonde Baltenweck, Philippe Hugueney, Stefano Caffarri, Michel Havaux
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Abstract

Arabidopsis plants were grown in white light (400-700 nm) or in white light supplemented with far-red (FR) light peaking at 730 nm. FR-enriched light induced the typical shade avoidance syndrome characterized by enhanced length of seedling hypocotyl and leaf petiole. FR supplementation also caused a noticeable decrease in the carotenoid and chlorophyll content that was attributable to a block of pigment accumulation during plant development. The carotenoid decrease resulted from a downregulation of their biosynthesis pathway rather than carotenoid degradation. The losses of photosynthetic pigments are part of structural and functional rearrangements of the photosynthetic apparatus. The plastoquinone pool was chronically more oxidized in plants acclimated to white + FR light compared to white light-grown plants. Growth in FR-enriched light was associated with a higher photochemical efficiency of PSII compared to growth in white light and with a substantial increase in root and shoot biomass production. Light distribution between the photosystems was modified in favor of PSII by an increase in the PSII/PSI ratio and an inhibition of state transitions. Neither LHCII abundance nor nonphotochemical energy dissipation in the PSII chlorophyll antennae were modified significantly by the addition of FR light. A PSI supercomplex, not previously observed in Arabidopsis, was specifically found in plants grown in FR-enriched light. This large PSI complex contains a supplementary Lhca1-4 dimer, leading to a total of 6 LHCI antennae instead of 4 in the canonical PSI. Through those photosystem rearrangements and the synergistic interaction with white light, FR light is photosynthetically active and can boost photosynthesis and plant growth.

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远红外光照下的光系统重排、光合效率和植物生长。
拟南芥植株在白光(400-700 nm)或白光辅以峰值为 730 nm 的远红光(FR)下生长。富含 FR 的光诱导了典型的避光综合征,其特征是幼苗下胚轴和叶柄的长度增加。补充红外光还导致类胡萝卜素和叶绿素含量明显下降,这归因于植物生长过程中色素积累受阻。类胡萝卜素减少的原因是其生物合成途径下调,而不是类胡萝卜素降解。光合色素的损失是光合装置结构和功能重组的一部分。与白光生长的植物相比,适应白光+FR 光的植物质醌池的长期氧化程度更高。与在白光下生长相比,在富集 FR 光下生长的植物 PSII 的光化学效率更高,根和芽的生物量产量也大幅增加。通过增加 PSII/PSI 比率和抑制状态转换,光系统之间的光分布发生了有利于 PSII 的变化。加入 FR 光后,PSII 叶绿素触角中的 LHCII 丰度和非光化学能量耗散都没有显著改变。在拟南芥中以前未观察到的 PSI 超级复合物,在 FR 富集光下生长的植物中被特别发现。这个大型 PSI 复合物包含一个补充的 Lhca1-4 二聚体,导致总共有 6 个 LHCI 触角,而不是典型 PSI 中的 4 个。通过这些光系统重排以及与白光的协同作用,FR 光具有光合作用活性,可以促进光合作用和植物生长。
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来源期刊
The Plant Journal
The Plant Journal 生物-植物科学
CiteScore
13.10
自引率
4.20%
发文量
415
审稿时长
2.3 months
期刊介绍: Publishing the best original research papers in all key areas of modern plant biology from the world"s leading laboratories, The Plant Journal provides a dynamic forum for this ever growing international research community. Plant science research is now at the forefront of research in the biological sciences, with breakthroughs in our understanding of fundamental processes in plants matching those in other organisms. The impact of molecular genetics and the availability of model and crop species can be seen in all aspects of plant biology. For publication in The Plant Journal the research must provide a highly significant new contribution to our understanding of plants and be of general interest to the plant science community.
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