Effects of UV radiation on the photosynthesis of conchocelis of Porphyra haitanensis (Bangiales, Rhodophyta)
Effects of UV radiation on the photosynthesis of conchocelis of Porphyra haitanensis (Bangiales, Rhodophyta)
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DOI：
10.2216/ph07-88.1
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发表时间：
2008-05
期刊：
影响因子：
1.6
通讯作者：
Hongxia Jiang;K. Gao
中科院分区：
文献类型：
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作者：
Hongxia Jiang;K. Gao
H.酱和K.Gao。2008年。紫外线辐射对坛紫菜丝状体光合作用的影响植酸菌47：241-248。DOI：10.2216/07-88.1以前的研究表明紫菜植物的光合作用和形态建成会受到太阳紫外线辐射(UVR280-400 nm)的影响。然而，人们对它们丝状体阶段对紫外线的敏感性知之甚少。研究了不同发育阶段(营养期和孢子囊期)海棠丝状幼虫在自然和模拟太阳辐射条件下的光合作用表现，并比较了不同发育阶段(营养期和孢子囊期)的响应。在太阳辐射(UV-A为33.2W m−2，UV-B为0.85W m−2)或氙灯(UV-A为25.5W m−2，UV-B为1.15W m−2)下，紫外光的存在使PS II的有效量子效率降低了53-55%。在自由生活的植物中，UVR对二氧化碳的固定作用(38%)比在孢子囊丝状体中(14%)更少。从营养体期到孢子囊期，再到叶状体阶段，紫外光合耐性逐渐增强，这与紫外线吸收化合物和/或分化结构的含量增加有关。
H. Jiang and K. Gao. 2008. Effects of UV radiation on the photosynthesis of conchocelis of Porphyra haitanensis (Bangiales, Rhodophyta). Phycologia 47: 241–248. DOI: 10.2216/07-88.1 Previous studies showed that photosynthesis and morphogenesis of Porphyra plants could be affected by solar UV radiation (UVR: 280–400 nm). However, little is known about the sensitivity of their conchocelis stage to UVR. We investigated the photosynthetic performance of P. haitanensis conchocelis under natural and simulated solar radiation with or without UVR and compared its responses among different developmental stages (vegetative and sporangial phases). High solar PAR accounted for most of the reduction of the effective quantum yield of PS II. Presence of UVR further reduced the yield by 53–55% in contrast to PAR alone treatment under solar radiation (UV-A of 33.2 W m−2 and UV-B of 0.85 W m−2) or a xenon lamp (UV-A of 25.5 W m−2 and UV-B of 1.15 W m−2). CO2 fixation was more reduced by UVR in the free-living vegetative (38%) than in the sporangial conchocelis (14%). Photosynthetic tolerance of UVR increased from vegetative to sporangial phase, then to thallus stage, correlating with the increased contents of UV-absorbing compounds and/or differentiated structure.