Morphological and Photosynthetic Response to High and Low Irradiance of Aeschynanthus longicaulis. (30th June 2014)

• Record Type: Journal Article
• Authors: Li, Qiansheng; Deng, Min; Xiong, Yanshi; Coombes, Allen; Zhao, Wei
• Other Names: Hilbert Jean Louis Academic Editor.
• Is Part Of: TheScientificWorldjournal. Volume 2014(2014)
• Publication Date: 2014-06-30
• Subjects: Science -- Periodicals; Technology -- Periodicals; Medicine -- Periodicals; 505
• DOI: 10.1155/2014/347461
• Languages: English
• ISSNs: 2356-6140

Abstract

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 μ mol·m –2 ·s –1 and 150 μ mol·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 μ mol·m –2 ·s –1 ) and LSP (367 μ mol·m –2 ·s –1 ) and higher LCP (21.9 μ mol·m –2 ·s –1 ). The chlorophyll fluorescence parameter F v / F m was significantly lower and NPQ was significantly higher in high irradiance plants. RLCs showed significantly lower ETR max ⁡ and E k in plants under high irradiance. It can be concluded that the maximum PPFD of 650 μ mol·m –2 ·s –1 led to significant light stress and photoinhibition of A. longicaulis .