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不同温度对极北海带幼苗生长及光合特性的影响
梁洲瑞1,2, 刘福利1,2, 袁艳敏3, 杜欣欣4, 汪文俊1,2, 孙修涛1,2, 高亚平1,2, 王飞久1,2
1.农业农村部海洋渔业资源可持续利用重点开放实验室, 中国水产科学研究院 黄海水产研究所;2.青岛海洋科学与技术国家实验室, 海洋渔业科学与食物产出过程功能实验室;3.上海海洋大学 水产与生命学院;4.青岛农业大学 海洋科学与工程学院
摘要:
为研究极北海带幼苗在温度条件下的生理、生态适应性, 作者开展极北海带幼苗(1~15 cm)在不同温度下的相对生长速率以及光系统II最大荧光产量(Fv/Fm)、光合作用和呼吸作用等生长和生理响应研究, 探讨其最大表观光合速率、饱和光强(Isat)和光补偿点(Ic)等参数。得出以下结论: (1)极北海带幼苗生长的适宜温度范围为9~15℃, 温度上限为21℃; (2)极北海带幼苗在21℃胁迫24 h以上, 可导致其光合系统II产生不可逆损伤; (3)叶片长度对其幼苗的Fv/Fm有显著影响, 较大的幼苗相对耐受高温;(4)在5~17℃范围内, 极北海带幼苗Ic为4.6~15.4 μmol/(m2·s), Isat为52.4~100.3 μmol /(m2·s); (5)低温条件下, 极北海带幼苗可适应更弱的光照, 但相对不耐强光; 较大的极北海带幼苗则相对耐强光, 其适应更弱光照。本研究结果可为极北海带的人工育苗及养殖提供参考。
关键词:  极北海带  温度  叶绿素荧光  饱和光强  光补偿点
DOI:10.11759/hykx20171121003
分类号:
基金项目:现代农业产业技术体系藻类体系离岸式养殖岗位专项(CARS-50)、青岛市民生科技计划项目“极北海带海藻场构建关键技术研究”(17-3-3-65-nsh)和中国水产科学研究院基本科研业务费专项课题(2016PT03; 2016HY-JC0301)
Effect of different temperatures on growth and photosynthetic characteristic of Laminaria hyperborea young seedling
LIANG Zhou-rui,LIU Fu-li,YUAN Yan-min,DU Xin-xin,WANG Wen-jun,SUN Xiu-tao,GAO Ya-ping,WANG Fei-jiu
Abstract:
To clarify the physiological and ecological adaptability of Laminaria hyperborea young seedling with the length of 1-15 cm, the growth and physiological responses including the relative growth rate, optimal chlorophyll fluorescence quantum yield (Fv/Fm), photosynthesis and respiration were studied under different temperatures in this study. Moreover, the parameters including the maximal net photosynthetic rate, saturation irradiance (Isat) and light compensation point (Ic) were investigated. The main conclusions are as follows: (1) Under the experimental conditions, the optimum temperature for growth of L. hyperborea young seedling is 9-15℃, with 21℃ as the upper limit temperature. (2) L. hyperborea young seedling easily suffered from high temperature stress and the photosystem II showed that 21℃ for 24 h and more could made irreversible injury. (3) Length of blade influenced the Fv/Fm of young seedling obviously, and the larger seedling are relatively tolerant to high temperature. (4) Ic and Isat is 4.6-15.4 μmol/(m2·s) and 52.4-100.3 μmol/(m2·s) respectively within 5-17℃. (5) L. hyperborea young seedling under low temperature can adapt to lower light condition but can’t tolerate stronger light intensity than that under high temperature. The larger seedling are relatively tolerant to stronger light intensity and are adaptable in lower light condition. These results can provide the theoretical basis for the artificial breeding and cultivation of L. hyperborea in the future.
Key words:  Laminaria hyperborea  temperature  chlorophyll fluorescence  saturation irradiance  light compensation point
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