Photosynthetic efficiency of three C4 species is maintained under low light and high vapour pressure deficit

IF 6.1 2区生物学 Q1 PLANT SCIENCES

Plant Physiology and Biochemistry Pub Date : 2024-11-16 DOI:10.1016/j.plaphy.2024.109304

Ashraf Muhammad Arslan , Yi Ning Xu , Xuming Wang , Bo Ya Liu , Lei Li , Huixing Kang , Xiao Ying Gong

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引用次数: 0

Abstract

The photosynthetic efficiency of C₄ plants could be impaired in environments with low light and high vapour pressure deficit (VPD). However, the interactive effect of low light and high VPD on C₄ photosynthetic efficiency remains unexplored. We grew three C₄ species, Setaria viridis L., Sorghum sudanense (Piper) Stapf., and Zea mays L., under controlled high and low irradiance and VPD conditions in growth chambers. Gas exchange and chlorophyll fluorescence parameters were measured to estimate apparent maximum quantum yield (QY_max), and ¹³C discrimination of leaf dry mass (Δ_DM) was measured to estimate bundle-sheath leakiness (BS-leakiness). Averaged over VPD levels, net CO₂ assimilation rate at saturating light (A_sat) decreased in S. viridis and S. sudanense but not Z. mays under low irradiance. High VPD decreased A_sat of S. viridis but increased A_sat of Z. mays. QY_max was not significantly affected by low light, high VPD or their interaction, which was associated with the unchanged photochemical efficiency of photosystem II. Low light did not significantly influence BS-leakiness, while high VPD only increased BS-leakiness of Z. mays by 0.08 compared with low VPD at low irradiance. The insignificant interaction of low light and high VPD on QY_max and BS-leakiness indicates that these C₄ species could maintain photosynthetic efficiency under these unfavourable conditions.

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三种 C4 植物在低光照和高蒸汽压不足的条件下保持光合效率。

在光照不足和蒸汽压不足（VPD）较高的环境中，C4 植物的光合效率可能会受到影响。然而，低光照和高蒸气压差对 C4 植物光合效率的交互影响仍有待研究。我们在生长室中控制高、低辐照度和 VPD 条件下种植了三种 C4 植物：Setaria viridis L.、Sorghum sudanense (Piper) Stapf.和 Zea mays L.。测量气体交换和叶绿素荧光参数可估算表观最大量子产率（QYmax），测量叶片干重的 13C 鉴别值（ΔDM）可估算束鞘渗漏率（BS-leakiness）。在低辐照度条件下，平均VPD水平下的饱和光照下二氧化碳净同化率（Asat）在S. viridis和S. sudanense中下降，而在Z. mays中没有下降。高 VPD 会降低 S. viridis 的 Asat，但会提高 Z. mays 的 Asat。QYmax 没有受到弱光、高 VPD 或它们之间相互作用的明显影响，这与光系统 II 的光化学效率不变有关。弱光对 BS-leakiness 的影响不明显，而高 VPD 与低辐照度下的低 VPD 相比，仅使 Z. mays 的 BS-leakiness 增加了 0.08。弱光和高 VPD 对 QYmax 和 BS-leakiness 的交互作用不明显，这表明这些 C4 物种可以在这些不利条件下保持光合效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant Physiology and Biochemistry 生物-植物科学

CiteScore

11.10

自引率

3.10%

发文量

410

审稿时长

33 days

期刊介绍： Plant Physiology and Biochemistry publishes original theoretical, experimental and technical contributions in the various fields of plant physiology (biochemistry, physiology, structure, genetics, plant-microbe interactions, etc.) at diverse levels of integration (molecular, subcellular, cellular, organ, whole plant, environmental). Opinions expressed in the journal are the sole responsibility of the authors and publication does not imply the editors'' agreement. Manuscripts describing molecular-genetic and/or gene expression data that are not integrated with biochemical analysis and/or actual measurements of plant physiological processes are not suitable for PPB. Also "Omics" studies (transcriptomics, proteomics, metabolomics, etc.) reporting descriptive analysis without an element of functional validation assays, will not be considered. Similarly, applied agronomic or phytochemical studies that generate no new, fundamental insights in plant physiological and/or biochemical processes are not suitable for publication in PPB. Plant Physiology and Biochemistry publishes several types of articles: Reviews, Papers and Short Papers. Articles for Reviews are either invited by the editor or proposed by the authors for the editor''s prior agreement. Reviews should not exceed 40 typewritten pages and Short Papers no more than approximately 8 typewritten pages. The fundamental character of Plant Physiology and Biochemistry remains that of a journal for original results.