Leaf characteristics and diurnal variation of chlorophyll fluorescence in leaves of the ‘bana’ vegetation of the amazon region
Leaf characteristics and diurnal variation of chlorophyll fluorescence in leaves of the ‘bana’ vegetation of the amazon region
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DOI：
10.1007/s11099-008-0033-9
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发表时间：
2008-06
期刊：
影响因子：
2.7
通讯作者：
M. Sobrado
中科院分区：
文献类型：
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作者：
M. Sobrado
在6个优势种的亚马逊河流域的“巴纳”植被，叶片特征，色素成分，叶绿素（Chl）荧光参数进行了测量，在田间条件下的年轻和成熟的叶片。6种植物叶片δ 13 C值相似，表明在胞间和环境CO2浓度（Ci/Ca）相近的条件下，展开叶和展开叶都含有固定的有机质。高的叶片C/N值和负的δ 15 N值与该生境的极端缺氮相一致。叶绿素和类胡萝卜素的分析表明，扩大叶片有一个不完整的发展光合天线相比，成年叶片。光系统2（PS2）在中午的动态失活观察到在两个叶龄的Fv/Fm下降相比，黎明前的值。成年叶在一夜之间达到健康叶典型的Fv/Fm比率。扩展叶片的Fv/Fmin过夜恢复是不完全的。F0从中午到黎明前基本不变，Fv从中午到黎明前有增加的趋势。从中午抑郁症的恢复观察成年叶建议与光保护和非损伤PS2的驯化下调。
In six dominant species of the Amazonian ‘Bana’ vegetation, leaf blade characteristics, pigment composition, and chlorophyll (Chl) fluorescence parameters were measured in young and mature leaves under field conditions. Leaf δ13C was comparable in the six species, which suggested that both expanding and expanded leaves contained organic matter fixed under similar intercellular and ambient CO2concentration (Ci/Ca). High leaf C/N and negative δ15N values found in this habitat were consistent with the extreme soil N-deficiency. Analysis of Chl and carotenoids showed that expanding leaves had an incomplete development of photosynthetic antenna when compared to adult leaves. Dynamic inactivation of photosystem 2 (PS2) at midday was observed at both leaf ages as Fv/Fmdecreased compared to predawn values. Adult leaves reached overnight Fv/Fmratios typical of healthy leaves. Overnight recovery of Fv/Fmin expanding leaves was incomplete. F0remained unchanged from midday to predawn and Fvtended to increase from midday to predawn. The recovery from midday depression observed in adult leaves suggested an acclimatory down-regulation associated with photo-protection and non-damage of PS2.