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Photosynthetic temperature responses of tree species in Rwanda: evidence of pronounced negative effects of high temperature in montane rainforest climax species

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The sensitivity of photosynthetic metabolism to temperature has been identified as a key
uncertainty for projecting the magnitude of the terrestrial feedback on future climate change.
While temperature responses of photosynthetic capacities have been comparatively well
investigated in temperate species, the responses of tropical tree species remain unexplored.


We compared the responses of seedlings of native cold-adapted tropical montane rainforest
tree species with those of exotic warm-adapted plantation species, all growing in an intermediate
temperature common garden in Rwanda. Leaf gas exchange responses to carbon dioxide
(CO2) at different temperatures (20–40°C) were used to assess the temperature responses
of biochemical photosynthetic capacities.


Analyses revealed a lower optimum temperature for photosynthetic electron transport rates
than for Rubisco carboxylation rates, along with lower electron transport optima in the native
cold-adapted than in the exotic warm-adapted species. The photosynthetic optimum temperatures
were generally exceeded by daytime peak leaf temperatures, in particular in the native
montane rainforest climax species.


This study thus provides evidence of pronounced negative effects of high temperature in
tropical trees and indicates high susceptibility of montane rainforest climax species to future
global warming.

Key words: Africa, leaf energy balance, maximum rate of electron transport (Jmax), optimum temperature (Topt), stomatal conductance (gs), the maximum carboxylation rate of oxygenase (Vcmax), tropical montane
rainforest.

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Informasi Detail

Judul Seri

New Phytologist

No. Panggil

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Penerbit

www.newphytologist.com : New Phytologist Trust., 2015

Deskripsi Fisik

New Phytologist (2015) 206: 1000–1012

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

(2015) 206: 1000–1012

Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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