Plant Diversity ›› 2010, Vol. 32 ›› Issue (6): 519-527.DOI: 10.3724/SP.J.1143.2010.10095

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Photosynthetic Response of Incarvillea zhongdianensis (Bignoniaceae) Subject to Growth Irradiance

 XI  Xue-1、2 , LI  Shu-Yun-1, YAN  Ning-1, HU  Hong-1   

  1. 1 Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China;
    2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2010-05-05 Online:2010-12-25 Published:2010-06-28
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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

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