Photosynthetica

, Volume 48, Issue 3, pp 437–445

Different growth and physiological responses to experimental warming of two dominant plant species Elymus nutans and Potentilla anserina in an alpine meadow of the eastern Tibetan Plateau

Original Papers

Abstract

The effects of experimental warming on the growth and physiology of grass Elymus nutans and forb Potentilla anserina were studied by using open-top chambers (OTCs) in an alpine meadow of the eastern Tibetan Plateau. The warming treatment increased mean air and soil surface temperatures by 1.53°C and 0.50°C, respectively, but it reduced soil relative water content in the surface layer. Experimental warming enhanced the growth and gas exchange of E. nutans, while it reduced those of P. anserina. Experimental warming resulted in an increased efficiency of photosystem II (PSII) in E. nutans, while decreasing it in P. anserina; significantly stimulated non-photochemical quenching, antioxidative enzymes and non-enzymes in both species; and significantly reduced malondialdehyde content in E. nutans, while promoting it in P. anserina. The results of this study indicated that the two species showed different growth responses to experimental warming and their different physiological performances further indicated that experimental warming alleviated the negative effect of low temperature on the growth and development of E. nutans, but limited the competitive ability of P. anserina in the study region.

Additional key words

Elymus nutans experimental warming growth physiology Potentilla anserina 

Abbreviations

AOS

activated oxygen species

APX

ascorbate peroxidase

AQY

apparent quantum yield

CAT

catalase

Ci

intercellular CO2 concentration

E

transpiration rate

Fv/Fm

maximal PSII efficiency

gs

stomatal conductance

LCP

photosynthetic light compensation point

MDA

malondialdehyde

NPQ

non-photochemical quenching

OTC(s)

open-top chamber(s)

PAR

photosynthetically active radiation

PFD

photon flux density

Pmax

maximum net photosynthetic rate

PN

net photosynthesis rate

POD

peroxidase

qp

photochemical quenching

RD

dark respiration rate

SOD

superoxide dismutase

yield

actual photochemical efficiency of PSII in the light

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.ECORES Lab, Chengdu Institute of BiologyChinese Academy of SciencesChengduPeople’s Republic of China

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