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The Scientific World Journal
Volume 2014, Article ID 347461, 8 pages
http://dx.doi.org/10.1155/2014/347461
Research Article

Morphological and Photosynthetic Response to High and Low Irradiance of Aeschynanthus longicaulis

1School of Ecology, Shanghai Institute of Technology, Shanghai 201418, China
2Shanghai Chenshan Plant Science Research Center, Chinese Academy of Sciences, Shanghai Chenshan Botanical Garden, Shanghai 201602, China
3Herbarium and Botanic Garden, Benemerita Autonomous University of Puebla, 72000 Puebla, PUE, Mexico

Received 21 March 2014; Revised 11 June 2014; Accepted 16 June 2014; Published 30 June 2014

Academic Editor: Jean Louis Hilbert

Copyright © 2014 Qiansheng Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aeschynanthus longicaulis plants are understory plants in the forest, adapting to low light conditions in their native habitats. To observe the effects of the high irradiance on growth and physiology, plants were grown under two different light levels, PPFD 650 μmol·m–2·s–1 and 150 μmol·m–2·s–1 for 6 months. Plants under high irradiance had significantly thicker leaves with smaller leaf area, length, width, and perimeter compared to the plants grown under low irradiance. Under high irradiance, the leaf color turned yellowish and the total chlorophyll decreased from 5.081 mg·dm−2 to 3.367 mg·dm−2. The anthocyanin content of high irradiance leaves was double that of those under low irradiance. The plants under high irradiance had significantly lower Amax (5.69 μmol·m–2·s–1) and LSP (367 μmol·m–2·s–1) and higher LCP (21.9 μmol·m–2·s–1). The chlorophyll fluorescence parameter was significantly lower and NPQ was significantly higher in high irradiance plants. RLCs showed significantly lower and in plants under high irradiance. It can be concluded that the maximum PPFD of 650 μmol·m–2·s–1 led to significant light stress and photoinhibition of A. longicaulis.