中甸角蒿光合作用对生长光强的响应

doi:10.3724/SP.J.1143.2010.10095

摘要/Abstract

摘要：

在原生地和引种地对高山花卉中甸角蒿(1ncarvillea zhongdianensis)光合作用和叶片性状对生长光强的响应进行研究。结果表明：在香格里拉，光合速率 (Pn)、类胡萝卜素（Car)、色素比（Chla/b）均随光强的降低而下降；而比叶面积（SLA）、叶绿素b（Chlb）、叶氮含量（LNCa）随光强的降低而上升。中甸角蒿主要是通过叶片形态、生化效率和叶片氮分配来响应生长光强的变化，对生长光强的适应表现出较大可塑性，使得其相对比较容易引种驯化。中甸角蒿在香格里拉对光照具有较广的适应幅，从香格里拉移栽到昆明后，虽然Pn下降约10%，但RGR增加约30%，表明其可以在昆明较好生长。

关键词: 中甸角蒿, 光强, 光合速率, 叶片性状

Abstract:

Photosynthesis and leaf traits of Incarvillea zhongdianensis grown in different growth irradiances were investigated in ShangriLa and Kunming. The results showed that the photosyhthetic rate（Pn）, content of carotenoids（Car）, ratio of chlorophyll a to b（Chla/b）in Izhongdianensis decreased with the decreasing irradiance in ShangriLa, while specific leaf area（SLA）, chlorophyll b（Chlb）, leaf nitrogen content per unit area（LNCa）increased. The photosynthetic acclimation of Izhongdianensis to growth irradiance was mainly dependent on the adjustment of leaf anatomy, biochemical efficiency and leaf nitrogen partitioning into different photosynthetic components. This species showed a large plasticity in photosynthetic response to light intensity, which was contributive to its introduction and domestication. Izhongdianensis had wide adaption for irradiance in ShangriLa, after transplanted to Kunming, Pn decreased about 10%, but relative growth rate （RGR）increased 30%, which indicated that it could grow well under the irradiance condition of Kunming.

Key words: Incarvillea zhongdianensis, Irradiance, Photosynthetic rate, Leaf traits

中图分类号:

Q 945

席雪1、2 , 李树云1, 严宁1, 胡虹1. 中甸角蒿光合作用对生长光强的响应[J]. Plant Diversity, 2010, 32(6): 519-527.

XI Xue- , LI Shu-Yun-, YAN Ning-, HU Hong. Photosynthetic Response of Incarvillea zhongdianensis (Bignoniaceae) Subject to Growth Irradiance[J]. Plant Diversity, 2010, 32(6): 519-527.

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