Effects of shade treatments on the photosynthetic capacity, chlorophyll fluorescence, and chlorophyll content of Tetrastigma hemsleyanum Diels et Gilg
Effects of shade treatments on the photosynthetic capacity, chlorophyll fluorescence, and chlorophyll content of Tetrastigma hemsleyanum Diels et Gilg
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DOI：
10.1016/j.envexpbot.2008.12.008
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发表时间：
2009-03-01
影响因子：
5.7
通讯作者：
Lu, Hongfei
中科院分区：
文献类型：
--
作者：
Dai, Yajuan;Shen, Zonggen;Lu, Hongfei
在全光照和中、高遮荫条件下生长1个月，研究其对不同光照条件下的光合作用和叶绿素荧光响应。结果表明，在67%遮荫条件下，羊草的叶片大小和P-N值最大。遮荫90%的苗木叶片最小。在全光照和50%遮荫条件下生长的植株叶色为黄绿色。P-n值随PPFD增加到200pmolm(-2)、S(-1)时迅速增加，然后缓慢增加并达到最大值，当PPFD增加到1000mmolm(-2)时，P-n值缓慢下降。离子浓度以67%遮荫处理为最高，遮荫处理的LSP为600亩·m~(-2)·S(-1)。全光照和50%遮荫处理使ETR和QP降低不明显，NPQ增加，Chla、Chla、Chlb和总叶绿素含量增加，Chla/b值降低。结果表明，大于50%遮荫的光照强度会降低黄花菜的光合作用活性和生长。低于75%遮荫的光照限制了植物的碳同化，导致植株生长减慢。初步认为67%左右的遮荫是栽培羊肚菌的最佳光照条件。(C)2008爱思唯尔B.V.保留所有权利。
Tetrastigma hemsleyanum Diels et Gilg was grown under full sunlight and moderate and high levels of shade for one month to evaluate its photosynthetic and chlorophyll fluorescence response to different light conditions. The results showed that T hernsleyanum attained greatest leaf size and P-n when cultivated with 67% shade. Leaves of seedlings grown with 90% shade were the smallest. Leaf color of plants grown under full sunlight and 50% shade was yellowish-green. The P-n value increased rapidly as PPFD increased to 200 pmol m(-2) s(-1) and then increased slowly to a maximum, followed by a slow decrease as PPFD was increased to 1000 mu mol m(-2) s(-1). ion was highest for the 67% shade treatment and the LSP for this shade treatment was 600 mu mol m(2) s(-1). Full sunlight and 50% shade treatments resulted insignificant reduction of ETR and qP and increased NPQ, Chl a, Chl b and total chlorophyll content increased and Chl a/b values decreased with increased shading. Results showed that light intensity greater than that of 50% shade depressed photosynthetic activity and T hernsleyanum growth. Irradiance less than that of 75% shade limited carbon assimilation and led to decreased plant growth. Approximately 67% shade is suggested to be the optimum light irradiance condition for T hernsleyanum cultivation. (C) 2008 Elsevier B.V. All rights reserved.