Photosynthetic response to light and temperature in Laminaria digitata gametophytes from two French populations
Photosynthetic response to light and temperature in Laminaria digitata gametophytes from two French populations
复制标题
两个法国种群指状海带配子体对光和温度的光合反应
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
F. Gevaert
中科院分区：
文献类型：
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作者：
G. Delebecq;D. Davoult;M. Janquín;L. V. Oppliger;D. Menu;J. Dauvin;F. Gevaert
摘要鉴于越来越多的证据表明全球范围内海带床的普遍下降，了解海带配子体阶段对环境参数的生理反应至关重要。我们调查了光照和温度的生理反应，从两个种群的海带指状体在对比的环境沿着法国海岸的英吉利海峡。这两个群体的配子体是高度耐受强光通过一个有效的下调光合作用触发的叶黄素循环的激活。温度升高促进光合作用和光系统II表现出高抵抗短期暴露于高温目前在外地遇到的。两个网站的配子体显示出一些差异，在他们的色素含量和光合特性，但低复制和采样时间的差异排除了潜在的本地适应在每个网站的光照条件下，在以前发表的结果中观察到的成年孢子体测试。L.配子体毛地黄似乎对目前实地经历的辐射和温度条件有抵抗力，证实了它们在紧张的环境条件下对海带物种的持久性的作用。
ABSTRACT Given the growing body of evidence on the general decline of kelp beds worldwide, it is crucial to understand the physiological responses of kelp gametophyte stages to environmental parameters. We investigated the physiological responses to light and temperature of gametophytes from two populations of Laminaria digitata in contrasting environments along the French coast of the English Channel. Gametophytes of both populations were highly tolerant of high light through an efficient down-regulation of photosynthesis triggered by the activation of the xanthophyll cycle. Temperature increases promoted photosynthesis and photosystem II showed high resistance to short-term exposure to high temperatures currently encountered in the field. Gametophytes from the two sites displayed some differences in their pigment content and photosynthetic characteristics, but low replication and difference in time of sampling precluded tests of potential local adaptation to the light conditions at each site, as observed in previously published results on adult sporophytes. Gametophytes of L. digitata appeared to be resistant to irradiation and temperature conditions currently experienced in the field, confirming their role in persistence of kelp species under stressful environmental conditions.