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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

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。然而,红树林群落的人工恢复和改造首先需要关注的是如何进行红树种类的空间配置,这需要明确红树植物光适应的生理生态策略,为人工红树林群落的优化配置提供理论指导。该文选取无瓣海桑(Sonneratia apetala)、秋茄(Kandelia candel)、木榄(Bruguiera gymnorrhiza)、桐花树(Aegiceras corniculatum)、老鼠簕(Acanthus ilicifolius)、卤蕨(Acrostichum aureum)、银叶树(Heritiera littoralis)和黄槿(Hibiscus tiliaceus)为研究对象,通过遮荫控制试验,研究这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%)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,无瓣海桑、秋茄、桐花、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SOD和APX等抗氧化酶活性在10%光照强度处理下的活性与对照并无显著差异,无瓣海桑、秋茄、桐花树、银叶树和黄槿的抗氧化酶活性总体呈下降趋势。以上结果说明,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耐阴性,适宜种植在光照条件稍弱的林下;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。

英文摘要:The restoration and reconstruction of mangrove wetland ecosystems is one of the key research fields in ecological restoration in the coastal zones of South China. How to optimize the assembly of mangrove species is the priority to be concerned in the restoration and transformation of mangrove forest community. In order to reveal the physiological and ecological strategies to light conditions of mangrove plant species and provide theoretical guidance for optimal assembly of mangrove community structure, the characteristics of leaf total soluble protein content and activities of five antioxidant enzymes in seedlings of eight mangrove plant species (Sonneratia apetala, Kandelia candel, Bruguiera gymnorrhiza, Aegiceras corniculatum, Acanthus ilicifolius, Acrostichum aureum, Heritiera littoralis and Hibiscus tiliaceus) under different light intensities (100%, 45%, 30%, and 10% of natural sunlight) were studied using shading control experiment. The results were as follows: (1) Low light intensities had little impact on the leaf total soluble protein content of Bruguiera gymnorrhiza, Acanthus ilicifolius and Acrostichum aureum, whereas the other five species showed a decreasing trend in the leaf soluble protein content with the decline in light intensity. (2) The activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX) in the leaves of Bruguiera gymnorrhiza, Acanthus ilicifolius and Acrostichum aureum in 10% of natural light intensity were not significantly from control, while the other five mangrove species showed a decreasing trend in activities of all the five antioxidant enzymes. In conclusion, our results indicate that Bruguiera gymnorrhiza, Acanthus ilicifolius and Acrostichum aureum are suitable for planting under the forest with high canopy density, while Sonneratia apetala, Kandelia candel, Aegiceras corniculatum, Heritiera littoralis, Hibiscus tiliaceus are suitable to be planted under forest with lower canopy density or planted as upper layer tree species in mangrove.

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[V1] 2022-07-05 17:05:48 chinaXiv:202207.00015V1 下载全文
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