八种红树植物幼苗的叶片可溶性蛋白和抗氧化酶活性对光强的响应

朱一民<sup>1; 3</sup>; 李 婷<sup>1; 3</sup>; 景宇杭<sup>1; 3</sup>; 曹洪麟<sup>1; 2; 3</sup>; 叶万辉<sup>1; 2; 3</sup>; 沈 浩<sup>1; 2; 3*</sup>

引用本文:	朱一民, 李婷, 景宇杭, 曹洪麟, 叶万辉, 沈浩.八种红树植物幼苗的叶片可溶性蛋白和抗氧化酶活性对光强的响应[J].广西植物,2023,43(4):606-615.[点击复制]
	ZHU Yimin, LI Ting, JING Yuhang, CAO Honglin, YE Wanhui, SHEN Hao.Responses of soluble protein contents and antioxidant enzyme activities in leaves of eight mangrove species seedlings to light intensities[J].Guihaia,2023,43(4):606-615.[点击复制]

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八种红树植物幼苗的叶片可溶性蛋白和抗氧化酶活性对光强的响应
朱一民^1,3, 李婷^1,3, 景宇杭^1,3, 曹洪麟^1,2,3, 叶万辉^1,2,3, 沈浩^1,2,3*
1. 中国科学院退化生态系统植被恢复与管理重点实验室/广东省应用植物学重点实验室, 中国科学院华南植物园, 广州 510650;2. 南方海洋科学与工程广东省实验室(广州), 广州 511458;3. 中国科学院大学, 北京 100049

摘要:

红树林湿地生态系统的恢复与重建是我国南方海岸带生态恢复研究的重点领域之一。为明确红树植物光适应的生理生态策略,该文选取无瓣海桑(Sonneratia apetala)、秋茄(Kandelia obovata)、木榄(Bruguiera gymnorhiza)、桐花树(Aegiceras corniculatum)、老鼠簕(Acanthus ilicifolius)、卤蕨(Acrostichum aureum)、银叶树(Heritiera littoralis)和黄槿(Hibiscus tiliaceus)作为研究对象,通过遮荫控制试验,探究这8种红树植物一年生幼苗在不同光照强度(自然光强的100%、45%、30%、10%)处理下的叶片可溶性蛋白含量和抗氧化酶活性的响应特征。结果表明:(1)随光照强度下降,木榄、老鼠簕和卤蕨的叶片可溶性蛋白含量受到的影响较小,而无瓣海桑、秋茄、桐花树、银叶树和黄槿的叶片可溶性蛋白含量则表现出下降趋势。(2)木榄、老鼠簕和卤蕨的超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)等抗氧化酶活性在10%光照强度处理下的活性与对照无显著差异,而无瓣海桑、秋茄、桐花树、银叶树和黄槿的抗氧化酶活性则总体呈下降趋势。从对光照的生理适应角度来看,木榄、老鼠簕和卤蕨具有一定的耐阴性,适宜种植在郁闭度较高的林下; 无瓣海桑、秋茄、桐花树、银叶树和黄槿适宜作为中上层树种或在郁闭度较低的林下种植。该研究结果为人工红树群落的优化配置提供了理论指导。

关键词: 红树植物, 光照强度, 抗氧化酶, 可溶性蛋白, 生理适应

DOI：10.11931/guihaia.gxzw202203088

分类号:Q945.78

文章编号:1000-3142(2023)04-0606-10

基金项目:广东省林业科技创新项目(2017KJCX036, 2019KJCX015); 南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0408); 自然资源事务管理-生态林业建设专项资金项目([2021]15); 广东省科技计划项目(2017A020217001)。

Responses of soluble protein contents and antioxidant enzyme activities in leaves of eight mangrove species seedlings to light intensities

ZHU Yimin^{1, 3}, LI Ting^{1, 3}, JING Yuhang^1,3, CAO Honglin^1,2,3, YE Wanhui^1,2,3, SHEN Hao^1,2,3*

1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems/Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;2. Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 511458, China;3. University of Chinese Academy of Sciences, Beijing 100049, China 1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems/Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; 2. Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)
, Guangzhou 511458, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China

Abstract:

The restoration and reconstruction of mangrove wetland ecosystem is one of the key research fields in ecological restoration in the coastal zone of South China. In order to reveal the physiological and ecological strategies to light conditions of mangrove species, the characteristics of leaf soluble protein contents and activities of antioxidant enzymes in seedlings of eight mangrove species(Sonneratia apetala, Kandelia obovata, Bruguiera gymnorhiza, Aegiceras corniculatum, Acanthus ilicifolius, Acrostichum aureum, Heritiera littoralis and Hibiscus tiliaceus)under different light intensity treatments(100%, 45%, 30%, and 10% of natural light intensity)were studied using shading control experiment. The results were as follows:(1)Low light intensities had little effect on the leaf soluble protein contents of Bruguiera gymnorhiza, Acanthus ilicifolius and Acrostichum aureum, whereas the other five species showed a decreasing trend of leaf soluble protein contents with the decline in light intensity.(2)The activities of superoxide dismutase(SOD)and ascorbate peroxidase(APX)in the leaves of Bruguiera gymnorhiza, Acanthus ilicifolius and Acrostichum aureum under 10% of natural light intensity treatment had no significant differences compared with the control, while the other five mangrove species showed a decreasing trend of all the five antioxidant enzyme activities. In conclusion, the results indicate that Bruguiera gymnorhiza, Acanthus ilicifolius and Acrostichum aureum are suitable to be planted under the forest with high canopy density, while Sonneratia apetala, Kandelia obovata, Aegiceras corniculatum, Heritiera littoralis, Hibiscus tiliaceus are suitable to be planted under the forest with lower canopy density or planted as middle and upper layer tree species in mangrove. The results of this study provide theoretical guidance for the optimal allocation of artificial mangrove communities.

Key words: mangrove species, light intensity, antioxidant enzymes, soluble protein, physiological adaptation