Temperature-dependent gas exchange and stomatal/non-stomatal limitation to CO2 assimilation of Quercus liaotungensis under midday high irradiance

Title:

Temperature-dependent gas exchange and stomatal/non-stomatal limitation to CO2 assimilation of Quercus liaotungensis under midday high irradiance

Creator:

Zhang, Shouren, Li, Qingkang, Ma, Keping, and Chen, Lingzhi

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:727c376b-30ae-4d25-92e1-2fed9d355262
uuid:727c376b-30ae-4d25-92e1-2fed9d355262
issn:0300-3604
doi:10.1023/A:1015130326683

Subject:

carboxylation rate, diurnal course of gas exchange, internal CO2 concentration, photosynthesis, stomatal conductance, transpiration rate, and water use efficiency

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The effects of varying leaf temperature (T1) on some ecophysiological characteristics of photosynthesis for Quercus liaotungensis Koiz. under ambient radiation stress around midday on clear summer days were investigated using an IRGA equipped with a temperature-controlled cuvette. Net photosynthetic rate (PN) decreased as T1 increased from 30 to 35 °C as a result of stomatal closure, whereas non-stomatal limitation led to decreased PN in the T1 range of 35-45 °C. Decreased transpiration rate (E) and stomatal conductance (gs) at leaf temperatures above 30 °C were interpreted as a combined 'feedward' effect as a result of enhanced leaf-air vapour pressure deficit (VPD) and stomatal closure. Changes in E from T1 30 to 20 °C depended on VPD when gs was maintained constant. Water use efficiency (WUE) varied inversely with T1 by following a hyperbola. A decrease in intercellular CO2 concentration (Ci) occurred as a result of stomatal closure and a relatively high carboxylation capacity, whereas inactivation of mesophyll carboxylation in combination with photorespiration might be associated with the observed increase in Ci in the T1 range of 40 to 45 °C. and Shouren Zhang ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

383-388

Source:

Photosynthetica | 2001 Volume:39 | Number:3

Harvested from:

CDK

Metadata only:

false