西沙群岛草海桐的抗逆生物学特性

徐贝贝<sup>1; 2</sup>; 刘 楠<sup>1</sup>; 任 海<sup>1</sup>; 王馨慧<sup>1; 3</sup>; 刘 念<sup>2</sup>; 简曙光<sup>1*</sup>

引用本文:	徐贝贝, 刘楠, 任海, 王馨慧, 刘念, 简曙光.西沙群岛草海桐的抗逆生物学特性[J].广西植物,2018,38(10):1277-1285.[点击复制]
	XU Beibei, LIU Nan, REN Hai, WANG Xinhui, LIU Nian, JIAN Shuguang.Stress resistance biological characteristics of Scaevola sericea in Paracel Islands[J].Guihaia,2018,38(10):1277-1285.[点击复制]

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西沙群岛草海桐的抗逆生物学特性
徐贝贝^1,2, 刘楠¹, 任海¹, 王馨慧^1,3, 刘念², 简曙光^1*
1. 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. 仲恺农业工程学院, 广州510225;3. 中国科学院大学, 北京 100049

摘要:

热带珊瑚岛由于光照强、季节性干旱明显、土壤贫瘠、保水能力差而少有植物生长。草海桐(Scaevola sericea)是一种典型的热带滨海植物,是西沙群岛珊瑚岛植被中的主要建群种,在海岛和海岸带防风固沙及植被生态恢复等方面发挥着重要作用。该研究对西沙群岛自然环境下草海桐的形态解剖学特征、抗氧化能力、抗逆性物质含量及营养元素含量等进行了研究。结果表明:草海桐具有阳生性植物特征,叶片及上表皮厚、气孔密度小、导管直径及水力导管直径大,有利于其适应珊瑚岛干旱环境; 其体内的超氧化物歧化酶和过氧化氢酶活性与其他受胁迫植物相比较要高,脱落酸含量也较高,表明草海桐对珊瑚岛环境具有较强的适应性及抗逆性; 其根际土壤养分含量偏低,但植物体内营养元素含量却较高,表明草海桐对土壤养分的利用效率高。这说明草海桐能够很好地适应干旱、贫瘠的珊瑚砂环境,具有较强的抗逆及适应能力。

关键词: 草海桐, 形态解剖特征, 抗逆性, 营养元素

DOI：10.11931/guihaia.gxzw201711012

分类号:Q948

文章编号:1000-3142(2018)10-1277-09

基金项目:国家重点研发计划项目(2016YFC1403002); 中国科学院A类战略性先导科技专项项目(XDA13020500); 国家“十二五”农村领域科技计划项目(2015BAL04B04); 广东省科技计划项目(2016A030303044)[Supported by the National Key R & D Program of China(2016YFC1403002); Strategic Priority Research Program of the Chinese Academy of Sciences(XDA13020500); the National Science and Technology Program of During the 12th Five-Year Plan of China(2015BAL04B04); Guangdong Provincial Technology Program(2016A030303044)]。

Stress resistance biological characteristics of Scaevola sericea in Paracel Islands

XU Beibei^1,2, LIU Nan¹, REN Hai¹, WANG Xinhui^1,3, LIU Nian², JIAN Shuguang^1*

1. Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;2. Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China;3. University of Chinese Academy of Sciences, Beijing 100049, China 1. Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; 2. Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China

Abstract:

There are few plants in tropical coral islands because of hard light, obvious seasonal drought, barren soil and poor water retention capacity of soil. As a typical coastal plant species and the main constructive species of coral island vegetation in Paracel Islands, Scaevola sericea plays important roles in sand-fixation, wind resistance and ecological restoration on the vegetation of islands and coastal zones. In this study, we analyzed the morphological and anatomical characteristics, antioxidant capacity, resistant substance contents and nutrient compositions of S. sericea growing in the natural habitat in Paracel Islands. The results showed that S. sericea was a heliophyte with thick leaf and epicuticle, low stomatal density and large vessel diameter and hydraulically weighted vessel diameter, which helps S. sericea adapt to the drought, high temperature and intense light irradiation. The activities of superoxide dismutase and catalase were higher than those of other plants under stress, and the high content of abscisic acid in the leaves revealed that S. sericea had strong adaptability and resistance. The contents of nutrient elements in the leaves of S. sericea were higher than those in rhizosphere soil, indicating that S. sericea has strong stress resistance and good adaptability to the arid and barren environment.

Key words: Scaevola sericea, morphological and anatomical characteristics, resistance, nutrient element