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Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau

Content Provider	Springer Nature Link
Author	Cui, Xiaoyong Gu, Song Wu, Jing Tang, Yanhong
Copyright Year	2008
Abstract	Bryophytes are widely distributed in alpine meadow and wetlands on the Tibetan Plateau, where light intensity and air moisture are highly variable in time. To address how bryophytes respond to their light and moisture environments, we examined dynamic photosynthesis in two moss species, Distichium inclinatum common in meadow, and Encalypta alpine frequently found in wetland. Photosynthetic induction response was faster in the two moss species than in most vascular species. In both species the 90% induction time after a sudden light increase from 50 to 600 μmol m$^{−2}$ s$^{−1}$ was within 3 min. The induction was faster in mosses experiencing a period of weak light than in those in total darkness. E. alpina, the wetland species, showed more rapid induction response and shorter post-illumination CO$_{2}$ fixation to sunflecks than D. inclinatum, the meadow species. Photosynthetic rate (A $_{max}$) under saturated light in the two species increased linearly with increasing air relative humidity (RH). The meadow species D. inclinatum showed higher A $_{max}$ under low RHs, but exhibited lower A $_{max}$ under high RHs in comparison with the wetland moss E. alpina. Moreover, the quantum efficiency increased linearly with increasing RH, indicating that air humidity plays a critical role in photochemical activities in the alpine mosses. The study suggests that there are acclimations in dynamic photosynthesis in response to light and humidity, and the acclimations would benefit a high leaf carbon gain in the two alpine moss species in their common habitats.
Starting Page	645
Ending Page	653
Page Count	9
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	24
Issue Number	3
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2008-08-26
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alpine meadow Carbon gain Moss Photosynthetic induction Relative humidity Forestry Behavioural Sciences Evolutionary Biology Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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