广西科学2026，Vol.33Issue(1)：45-53,9.DOI:10.13656/j.cnki.gxkx.20251229.001
潮间带暴露时长与光照强度对单脉二药草光合活性的协同影响研究
Synergistic Effects of Intertidal Exposure Duration and Light In-tensity on the Photosynthetic Activity of Halodule uninervis
摘要
Abstract
The intertidal seagrass is challenged by periodic exposure to the intertidal zone.To investigate the effects of exposure duration and light intensity on intertidal seagrasses,this study focused on Halodule unin-ervis,a typical tropical seagrass species.Under controlled laboratory conditions,varying intertidal exposure duration(0.0-4.0 h)and light intensities(weak light:6 400-9 700 lx;medium light:25 000-49 000 lx;strong light:100 000-130 000 lx)were simulated,and the plant growth,photosynthetic physiology,and an-tioxidant system responses were systematically analyzed.The results showed that short-term intertidal expo-sure(≤2.5 h)significantly enhanced photosynthetic activity compared with no exposure.Photosynthate(glucose)and photosynthetic pigment content peaked at the time point of 2.0 h,while the leaf growth rate,root vitality,maximum photochemical efficiency,potential activity,photochemical quenching coefficient,and actual photochemical quantum yield increased significantly,reaching maximum values at the time point of 2.5 h.These findings indicated that H.uninervis effectively utilized brief exposure periods to enhance CO2 assim-ilation.In contrast,prolonged intertidal exposure(>2.5 h)induced photoinhibition and oxidative stress,as evidenced by sharp declines in the activities of antioxidant enzymes after peaking at the time point of 3.0 h,accompanied by reductions in maximum photochemical efficiency and photochemical quenching coefficient,and significant increases in non-photochemical quenching coefficient and non-regulated energy dissipation,in-dicating damage to the photosystem of H.uninervis.This study reveals a dual adaptive mechanism of H.uninervis to the light conditions in intertidal zones and provides important theoretical insights into the envi-ronmental adaptation strategies of intertidal seagrasses.关键词
海草床/潮间带暴露/胁迫/光合生理/生态阈值Key words
seagrass bed/intertidal exposure/stress/photosynthetic physiology/ecological threshold分类
农业科技引用本文复制引用
刘明中,张臻,史云峰,赵牧秋,王雨鑫,倪珍..潮间带暴露时长与光照强度对单脉二药草光合活性的协同影响研究[J].广西科学,2026,33(1):45-53,9.基金项目
海南热带海洋学院引进人才科研启动项目(RHDRC202308),2023年海南省自然科学基金青年基金项目(423QN250),2022年海南省自然科学基金青年基金项目(322QN325),国家自然科学基金地区科学基金项目(42466007)和海南热带海洋学院崖州湾创新研究院重大科技计划项目(2022CXYZD002)资助. （RHDRC202308）
