| 摘要: |
| 濒危海草贝克喜盐草（Halophila beccarii）主要生长在印度洋-太平洋地区沿岸不同盐度的潮间带生境。为探究贝克喜盐草在不同盐度条件下的适应策略，本研究以贝克喜盐草为实验对象，在室内可控的生态水槽内开展不同盐度（0‰、10‰、20‰和30‰）对贝克喜盐草生长适应性影响的研究 。结果表明：（1）盐度为20‰时贝克喜盐草具有最大的叶长、叶宽和叶柄长，盐度为10‰时具有最大的生长端密度和直立茎密度。（2）在中等盐度（10‰和20‰）下，叶片形态参数与生长端密度或直立茎密度总体呈正相关关系，而在淡水（盐度为0‰）或相对较高的盐度（盐度为30‰）下，叶片形态参数趋向于与生长端密度或直立茎密度呈负相关关系。（3）主成分分析结果表明，盐度为10‰条件下有利于贝克喜盐草生长端和直立茎的生长，而盐度为20‰时有利于贝克喜盐草叶片的生长。研究结果对深入理解贝克喜盐草对不同盐度的适应机制具有重要意义。 |
| 关键词: 贝克喜盐草，盐度胁迫，叶片形态，直立茎密度，生长端密度 |
| DOI： |
| 投稿时间：2024-07-23修订日期：2024-10-27 |
| 基金项目:国家自然科学基金(32170399),自治区直属公益性科研院所基本科研业务费项目(2022GMRC-01,2022GMRC-02),广西科学院改革发展专项项目(2024YGFZ504-102)。 |
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| Effects of different Salinity on Leaf and Stem Morphology of the Threatening Seagrass Halophila beccarii |
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YANG Zixuan1, PAN Yuanfang2, QIU Guanglong2, HUANG Liangliang1
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| (1.Guilin University of Technology;2.Guangxi Academy of Marine Sciences (Guangxi Mangrove Research Center)) |
| Abstract: |
| The threatening seagrass, Halophila beccarii mainly grows in intertidal habitats with different salinities such as bays and estuaries along the coasts of the Indian Ocean Pacific region. To investigate the adaptation effects under different salinities, H. beccarii was cultured along salinity gradients (0 psu, 10 psu (CK), 20 psu, and 30 psu) for 3 months in an indoor controllable ecological water tank system. The results showed that: (1) when the salinity was 20, H. beccarii had the maximum leaf length, leaf width, and petiole length, and when the salinity was 10, it had the maximum density of meristems and shoots. (2) at moderate salinity (10 psu and 20 psu), leaf morphology parameters tend to be positively correlated with the density of meristems or shoots, while at relatively low or high salinity (0 psu and 30 psu), leaf morphology parameters tend to be negatively correlated with the density of meristems or shoots. (3) the results of principal component analysis showed that a salinity of 10 was beneficial for the growth of the meristems and shoots of H. beccarii, while a salinity of 20 psu was beneficial for the growth of the leaves. The research results are of great significance for a deeper understanding of the adaptation mechanism of H. beccarii along different salinities. |
| Key words: Halophila beccarii, salinity stress, leaf morphology, shoot density, meristems density |
