Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1093/jxb/erx052

Ключевые слова: Ball-Berry model, elevated temperature, evaporative cooling, global change, heat waves, stomatal conductance

Аннотация: The effect of temperature on stomatal conductance (g(s)) and corresponding gas exchange parameters was studied in two tree species with contrasting leaf anatomy and ecophysiology-a broadleaf angiosperm, Populus deltoides x nigra (poplar), and a needle-leaf gymnosperm, Pinus taeda (loblolly pine). Experiments were conducted in growth chambers across a leaf temperature range of 19-48 degrees C. Manipulations of temperature were done in well-watered and drought soil conditions and under ambient (400 ppm) and elevated (800 ppm) air CO2 concentrations. Increases in leaf temperature caused stomatal opening at both ambient and elevated%CO2]. The gs increased by 42% in poplar and by 40% in loblolly pine when leaf temperature increased from 30 degrees C to 40 degrees C at a vapour pressure difference of 1 kPa. Stomatal limitation to photosynthesis decreased in elevated temperature in loblolly pine but not in poplar. The ratio of net photosynthesis to gs depended on leaf temperature, especially at high temperatures. Evaporative cooling of transpiring leaves resulted in reductions in leaf temperature up to 9 degrees C in well-watered poplar but only 1 degrees C in drought-stressed poplar and in loblolly pine. As global mean temperatures rise and temperature extremes become more frequent and severe, understanding the effect of temperature on g(s), and modelling that relationship, will become increasingly important.

Журнал: JOURNAL OF EXPERIMENTAL BOTANY

Выпуск журнала: Vol. 68, Is. 7

Номера страниц: 1757-1767

ISSN журнала: 00220957

Место издания: OXFORD

Издатель: OXFORD UNIV PRESS

• Urban Josef (Mendel Univ Brno, Dept Forest Bot Dendrol & Geobiocenol, Brno, Czech Republic; Siberian Fed Univ, Krasnoyarsk, Russia)
• Ingwers Miles W. (Univ Georgia, Inst Plant Breeding Genet & Genom, Athens, GA 30602 USA)
• McGuire Mary Anne (Univ Georgia, Daniel B Warnell Sch Forestry & Nat Resources, Athens, GA 30602 USA)
• Teskey Robert O. (Univ Georgia, Daniel B Warnell Sch Forestry & Nat Resources, Athens, GA 30602 USA)

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