4.8 Article

Upregulation of bundle sheath electron transport capacity under limiting light in C4 Setaria viridis

期刊

PLANT JOURNAL
卷 106, 期 5, 页码 1443-1454

出版社

WILEY
DOI: 10.1111/tpj.15247

关键词

Setaria viridis; C4 photosynthesis; light harvesting; electron transport; bundle sheath; Photosystem II; chloroplast NAD(P)H dehydrogenase complex

资金

  1. Centre for Advanced Microscopy at the Australian National University
  2. Australian Plant Phenomics Facility supported under the National Collaborative Research Infrastructure Strategy of the Australian Government
  3. Australian Research Council Centre of Excellence for Translational Photosynthesis [CE140100015]
  4. H2020 Marie Skodowska-Curie Individual Fellowship (DILIPHO) [702755]
  5. Marie Curie Actions (MSCA) [702755] Funding Source: Marie Curie Actions (MSCA)

向作者/读者索取更多资源

C-4 photosynthesis in shade-acclimated plants involves adjustments in the supramolecular composition of PSII in bundle sheath cells to optimize the redox state of the plastoquinone pool, enhancing linear electron flow capacity. Additionally, low light conditions lead to increased abundance of crucial electron transport proteins in bundle sheath cells, contributing to the maintenance of CO2 assimilation rates in C-4 plants. These findings provide insights into the acclimation mechanisms of C-4 plants under different light environments and suggest strategies for improving crop productivity through the engineering of C-4 photosynthesis into C-3 plants.
C-4 photosynthesis is a biochemical pathway that operates across mesophyll and bundle sheath (BS) cells to increase CO2 concentration at the site of CO2 fixation. C-4 plants benefit from high irradiance but their efficiency decreases under shade, causing a loss of productivity in crop canopies. We investigated shade acclimation responses of Setaria viridis, a model monocot of NADP-dependent malic enzyme subtype, focussing on cell-specific electron transport capacity. Plants grown under low light (LL) maintained CO2 assimilation rates similar to high light plants but had an increased chlorophyll and light-harvesting-protein content, predominantly in BS cells. Photosystem II (PSII) protein abundance, oxygen-evolving activity and the PSII/PSI ratio were enhanced in LL BS cells, indicating a higher capacity for linear electron flow. Abundances of PSI, ATP synthase, Cytochrome b(6)f and the chloroplast NAD(P)H dehydrogenase complex, which constitute the BS cyclic electron flow machinery, were also increased in LL plants. A decline in PEP carboxylase activity in mesophyll cells and a consequent shortage of reducing power in BS chloroplasts were associated with a more oxidised plastoquinone pool in LL plants and the formation of PSII - light-harvesting complex II supercomplexes with an increased oxygen evolution rate. Our results suggest that the supramolecular composition of PSII in BS cells is adjusted according to the redox state of the plastoquinone pool. This discovery contributes to the understanding of the acclimation of PSII activity in C-4 plants and will support the development of strategies for crop improvement, including the engineering of C-4 photosynthesis into C-3 plants.

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