Comparative diurnal variations in photosynthesis and transpiration of endangered plant species, Ostrya rehderiana and Acer yangjuechi

doi:10.3969/j.issn.1000-5641.2015.02.014

Abstract

Abstract: In order to compare the differences of gas exchange between suntolerant and shadetolerant plants, diurnal variations in photosynthetic and transpiration indices were measured using LI6400 portable photosynthesis system in two endangered species, Ostrya rehderiana Chun (suntolerance) and Acer yangjuechi Fang et P. L. Chiu (shadetolerance). Our results showed that O. rehderiana was a bimodal curve in diurnal change of photosynthesis rate (P_n), while A. yangjuechi was a unimodal curve. A. yangjuechi had a higher light use efficiency (RUE) than O. rehderiana under a relatively weak light (p<0.05), suggesting A. yangjuechi had an increased net photosynthesis rate (P _n) in weaker light conditions, e.g. under a longterm shade circumstance. The water use efficiency (WUE) was also higher in A. yangjuechi than in O. rehderiana (p<0.05). This indicated A. yangjuechi had a lower transpiration in shaded conditions.

Key words: Ostrya rehderiana, Acer yangjuechi, photosynthesis, transpiration, diurnal variation

CLC Number:

WANG Xiao-Yan, YANG Shu-Zhen, ZHAO Ming-Shui, LUO Yuan, CUI Min-Yan, LI Yuan-Yuan. Comparative diurnal variations in photosynthesis and transpiration of endangered plant species, Ostrya rehderiana and Acer yangjuechi[J]. Journal of East China Normal University(Natural Sc, 2015, 2015(2): 113-121.

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