Light-dependent photosynthetic characteristics indicated by chlorophyll fluorescence in five mangrove species native to Pohnpei Island, Micronesia
Light-dependent photosynthetic characteristics indicated by chlorophyll fluorescence in five mangrove species native to Pohnpei Island, Micronesia
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DOI：
10.1034/j.1399-3054.2003.00042.x
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发表时间：
2003-03-01
影响因子：
6.4
通讯作者：
Lihpai, S
中科院分区：
文献类型：
--
作者：
Kitao, M;Utsugi, H;Lihpai, S
为研究红树林植物对强光的适应能力，采用叶绿素荧光技术研究了海桑、红海榄、红海榄、木榄和木果木等5种红树林植物阳叶光合特性与光抑制的关系。这些物种被分为三个组：先锋-S。alba和R. stylosa，intermediate - R. apiculata和B. Gymnorrhiza和顶极种-X.石榴进一步的区别可以在两个中间种，耐荫性较低的R。apiculata和耐荫B.裸根草演替状态与光饱和电子传递速率（ETR）之间存在明显的相关性，其中S. alba和R. stylosa > R. apiculata和B. gymnorrhiza > X.石榴根据其光依赖ETR的初始斜率较低和暗适应后可变荧光与最大荧光的比值（F-v /F-m）较低的特点，X.石榴似乎比其他物种遭受更大的光抑制。光系统Ⅱ开放度q（P）对入射光的响应反映了S. alba和R. stylosa > R.尖叶类> B. gymnorrhiza和X.石榴R. apiculata和B.木榄的生长可能是由于B中较高的F '（v）/F'（m）所反映的较高的叶片吸收率和较低的热耗散程度。裸根草可见，叶片吸收率、热耗散和通过电子传递消耗吸收的光能的协调在红树林物种对暴露生境的驯化中是重要的。
To investigate the adaptive capacity to strong light among mangrove species, we examined light-dependent properties of photosynthesis in relation to photoinhibition using chlorophyll fluorescence for sun-leaves of five mangrove tree species; Sonneratia alba, Rhizophora stylosa, Rhizophora apiculata, Bruguiera gymnorrhiza and Xylocarpus granatum. These species were classified into three groups; pioneer-S. alba and R. stylosa, intermediate - R. apiculata and B. gymnorrhiza and climax species-X. granatum. A further distinction can be made between the two intermediate species, the less shade-tolerant R. apiculata and the shade-tolerant B. gymnorrhiza . There was a clear association between successional status and light-saturated electron transport rate (ETR) where ETR was higher in S. alba and R. stylosa > R. apiculata and B. gymnorrhiza > X. granatum . Based on its lower initial slope of light-dependent ETR and lower ratio of variable to maximum fluorescence (F-v /F-m) after a dark-adaptation, X. granatum appeared to suffer greater photoinhibition than other species. The response of q(P), which represents PSII openness, to incident light indicates a ranking of tolerant capacity to photoinhibition of S. alba and R. stylosa > R. apiculata > B. gymnorrhiza and X. granatum . The difference in q(P) response between R. apiculata and B. gymnorrhiza might be attributed to the higher leaf absorptance and the lower degree of thermal dissipation indicated by the higher F'(v)/F'(m) in B. gymnorrhiza . It appears that the co-ordination of leaf absorptance, thermal dissipation and consumption of absorbed light energy through electron transport is important in the acclimation of mangrove species to exposed habitats.