遮光对濒危植物海南马尾松幼苗光合作用的影响

IF 2.4 2区 农林科学 Q1 FORESTRY Forests Pub Date : 2023-12-19 DOI:10.3390/f15010003
Renjie Wang, Jinman Ma, Ronglin Huang, Yong Wang, Yinghong Jiang, Yaming Ling, Jisheng Yang, Huizi Liang, Xiongsheng Liu, Nanyan Liao
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引用次数: 0

摘要

遮荫是防止植物幼苗在极端天气和气候事件(如高温和热胁迫)中受到损害或伤害的管理措施之一。本研究调查了不同遮荫条件对中国广西濒危植物海南马尾松光合特性的影响。本研究对海南红豆杉幼苗进行了五种遮光处理,包括全日照20%(L1)、40%(L2)、60%(L3)、80%(L4)和100%(对照)。测量了受试幼苗直径和高度的净增长以及光合气体交换参数,包括光合速率(Pn)、蒸腾速率(Tr)、细胞间二氧化碳浓度(Ci)和水分利用效率(WUE)。利用OJIP曲线和820 nm光吸收曲线以及渗透物质和膜脂过氧化产物评估光合能力,确定光合碳同化的制约因素,并研究遮荫胁迫下幼苗光合系统II(PSII)和光合系统I(PSI)的影响机制。结果表明,L2处理的幼苗净生长量和Pn最高,光合性能最好,PSII和PSI的协调性最好。净光合作用(Pn)水平呈下降趋势,顺序如下:L2 > L3 > L4:L2 > L3 > L4 > L1。在 L1 处理中,非气孔因素成为影响幼苗 Pn 的主要决定因素。PSII 的性能指数(电位)代表了幼苗吸收的光子能量对系统间电子受体还原的守恒性(PIABS 和 ΔI/I0),其下降顺序为 L2 > L3 > L4 > L1。幼苗的光系统性能以及 PSII 和 PSI 之间的协调性(Φ(PSI/PSII))按照 L2 > L1 > L3 > L4 的顺序下降。在低度和中度遮光胁迫下(L1-L3),PSII 比 PSI 受到更严重的损伤,包括 PSII 供体侧和从 QB 到 PSI 受体侧的电子传递。相反,在重度遮光处理(L4)的胁迫下,PSI 比 PSII 受到的损伤更严重。考虑到其叶片渗透调节物质和膜脂过氧化产物的变化,我们的研究结果表明,L2 处理最有利于海南海棠幼苗的生长。相比之下,L1 处理使海南红豆杉幼苗受到的胁迫最大,导致其生长和光合机制受到严重破坏。我们的研究为保护和栽培海南金线莲等濒危植物物种选择合适的光照强度提供了科学依据和实践指导。
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The Effects of Shading on the Photosynthetic Performance of Endangered Plant Horsfieldia hainanensis Seedlings
Shading is one of the management practices for preventing the damage or injury of plant seedlings during extreme weather and climate events, such as very high temperatures and heat stress. In this study, we investigated the effects of different shading conditions on the photosynthetic characteristics of the endangered plant Horsfieldia hainanensis in Guangxi, China. The H. hainanensis seedlings in this study underwent five shading treatments, including 20% (L1), 40% (L2), 60% (L3), 80% (L4), and 100% (control) of full sunlight. The net growth of their diameter and height, and photosynthetic gas exchange parameters including their photosynthesis rate (Pn), transpiration rate (Tr), intercellular CO2 concentration (Ci), and water use efficiency (WUE) were measured for the examined seedlings. The OJIP curve and 820 nm light absorption curve, and the osmotic substances and products of membrane lipid peroxidation were employed to assess photosynthetic capacity, identify the factors constraining photosynthetic carbon assimilation, and investigate the mechanisms influencing photosystem II (PSII) and photosystem I (PSI) in the seedlings under shade stress. The results showed that the seedlings in the L2 treatments had the highest net growth and Pn, the best photosynthetic performance, and the best coordination between PSII and PSI. The net photosynthesis (Pn) levels exhibited a declining trend in the following order: L2 > L3 > L4 > L1. In the L1 treatment, non-stomatal factors emerged as the primary determinant affecting the Pn of the seedlings. The performance index (potential) of PSII, representing the conservation of absorbed photon energy to intersystem electron acceptor reduction (PIABS and ΔI/I0) of the seedlings, decreased in the order of L2 > L3 > L4 > L1. The photosystem performance and the coordination between PSII and PSI (Φ(PSI/PSII)) of the seedlings decreased in the order of L2 > L1 > L3 > L4. Under the low and moderate shading stresses (L1–L3), more serious damages occurred in PSII than in PSI, including on the donor side of PSII and in the electron transfer from QB to the acceptor side of PSI. In contrast, more considerable injury occurred in PSI than in PSII under the stress of the heavy shading treatment (L4). Considering the alterations in their leaf osmotic regulatory substances and membrane lipid peroxidation products, our findings indicate that the L2 treatment was the most conducive to the growth of the H. hainanensis seedlings. In contrast, the L1 treatment subjected H. hainanensis seedlings to the most significant stress, resulting in substantial damage to their growth and photosynthetic mechanisms. Our research provides a scientific insight into and a practical guide for the selection of an appropriate light intensity for the conservation and cultivation of endangered plant species, such as H. hainanensis.
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来源期刊
Forests
Forests FORESTRY-
CiteScore
4.40
自引率
17.20%
发文量
1823
审稿时长
19.02 days
期刊介绍: Forests (ISSN 1999-4907) is an international and cross-disciplinary scholarly journal of forestry and forest ecology. It publishes research papers, short communications and review papers. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles.
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