多甲藻对不同光照强度的反应:色素沉着及暗光适应的可能性(英文)

THE RESPONSE OF PERIDINIUM GATUNENSE TO DIFFERENT LIGHT REGIMES: ITS PIGMENTATION AND POSSIBLE IMPLICATIONS ON THE LIGHT-SHADE ADAPTATION

在ＨＰＬＣ色素分析的基础上，研究了多甲藻对不同光照强度（１６．６—２５０μ·Ｅｍ－２ｓ－１） 的反应。类胡萝卡素中最重要的多甲藻素和硅甲藻黄素占叶黄素总量的９０％。随光照强度的 逐步增加，多甲藻细胞中叶绿素ａ含量呈现明显的下降趋势。结果表明硅甲藻黄素和β胡萝卜 素具有光保护作用：１）当多甲藻暴露于较强光下时，硅甲藻黄素／叶绿素ａ之比呈现出明显增 加的趋势。β胡萝卜素／叶绿素ａ之比也显现出明显的增加趋势。２）β胡萝卜素／叶绿素ａ之比 在有光条件下比在完全黑暗条件下要高；３）硅甲藻黄素／叶绿素ａ之比在高辐照度、低辐照 度，及由高到低、由低到高辐照度处理时，显示出组间差异。由此可推出色素代谢可能的途径 及其湖沼学意义。

The response of Peridinium gatunense (formerly Peridinium cinctum fa. westii) to different light regimes was investigated based on pigment profiles, which were revealed by HPLC analyses, over the ranges of 16.6-250μE' m- 2 S-1 Peridinin and diadinoxanthin are the two most important carotenoids, shared about 90% of the total xanthophylls. Cellular chlorophyll a showed an evident drop along the increased irradiance gradients. Evidence was presented to show the role of diadinoxanthin and β-carotene as light protectants, including: l) diadinoxanthin / chlorophyll a ratios increased drastically when Peridinium was exposed to increased light gradients and β-carotene / chlorophyll a ratios also showed an obvious increasing tendency; 2) β-carotene / chlorophyll a ratios under light condition were higher than those under completely dark condition; and 3) diadinoxanthin / chlorophyll a ratios exhibited inter-group differences among high irradiance, low irradiance, high to low and low to high irradiance treatments. Hereby the possible implication for pigment metabolic routes and their limnological behaviour was deduced.