Behaviour and a functional xanthophyll cycle enhance photo-regulation mechanisms in the solar-powered sea slug Elysia timida (Risso, 1818)
Behaviour and a functional xanthophyll cycle enhance photo-regulation mechanisms in the solar-powered sea slug Elysia timida (Risso, 1818)
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DOI：
10.1016/j.jembe.2010.08.021
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发表时间：
2010-11-15
影响因子：
2
通讯作者：
Calado, Goncalo
中科院分区：
文献类型：
--
作者：
Jesus, Bruno;Ventura, Patricia;Calado, Goncalo
一些太阳能驱动的海参能够将叶绿体直接结合到它们的细胞质中，从而在相当长的时间内维持光合作用。这种现象被称为眼睑成形术。钾质体具很高的功能性，但对其光调节机制知之甚少。本研究的主要目的是利用从髋臼获取叶黄素循环的叶黄素循环植物来研究叶黄素循环的功能。用PAM荧光分析和高效液相色谱分析相结合的方法测试了叶黄素循环的功能。测定了两种生物的快速光曲线(RLC)和稳态光曲线。在700mmolE-1m(-2)S(-1)后出现一个在髋臼上看不到的Retr拐点。这归因于这样一个事实，即动物在高光强下关闭了副足，从而遮蔽了kleupplex，从而导致了更高的PSII量子效率。这一行为也导致了E-k值显著增加(ANOVA，F-(1.27)=7.49，p
Some solar-powered sea slugs are capable of incorporating chloroplasts directly in their cell cytosol sustaining photosynthesis for significant time periods. This phenomenon is known as kleptoplasty. Kleptoplastids show high functionality levels but little is known about their photo-regulatory mechanisms. The main objective was to investigate the functionality of the xanthophyll cycle using the sacoglossan Elysia timida that acquires kleptoplasts from Acetabularia acetabulum. Xanthophyll cycle functionality was tested using a combination of PAM fluorescence and HPLC pigment analysis. Rapid light curves (RLC) and steady state light curves were carried out in both organisms. E. timida RLC showed a rETR inflexion point after 700 mu mol E-1 m(-2) s(-1) that was not visible on A. acetabulum. This was attributed to the fact that the animal closed the parapodia in high light intensities, thus shading the kleptoplasts leading to higher PSII quantum efficiencies. This behaviour also resulted in E-k values being significantly higher in E. timida (ANOVA, F-(1.27)=7.49, p