A long-lasting photorespiration in CO2-free air, measured as the postirradiation CO2 burst, indicates mobilization of storage photosynthates

Title:

A long-lasting photorespiration in CO2-free air, measured as the postirradiation CO2 burst, indicates mobilization of storage photosynthates

Creator:

Xiong, Fusheng, Gao, Yuzhu, and Song, Ping

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:e4665d9e-904f-46c2-9299-ce1827c76c46
uuid:e4665d9e-904f-46c2-9299-ce1827c76c46
issn:0300-3604
doi:10.1023/A:1006882101535

Subject:

DCMU, iodoacetic acid, N-ethylmaleimide, photoinhibition, Pi, and Triticum

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

In CO2-free air, the CO2 postirradiation burst (PIB) in wheat leaves was measured with an IRGA in an open gas exchange system to ascertain its potential role in alleviating photoinhibition of photorespiratory carbon oxidation (PCO) under a CO2 deficiency. A pre-photosynthesized leaf having been transferred into CO2-free air exhibited a typical CO2 PIB following darkening which could last, with a rate substantially higher than that of dark respiration, over a long time period (at least more than 2 h) of continuously alternate irradiation (2 min)-dark (2 min)-light transitions. The rate and the time of PIB maintenance, although unaffected by the exogenous dark respiration inhibitor iodoacetic acid, were stimulated largely by increasing irradiance and O2 level, and suppressed by DCMU and N-ethyl-maleimide (NEM). They also showed a large photosynthates-loading dependence. In a darkened leaf, the irradiation-induced PIB in the CO2-free air was clearly revealed and it was characterized by an initial net uptake of respiratory CO2. The light-induced PIB was accelerated by increasing irradiance, and delayed by prolonging the period of darkening the leaves. Hence, the origin of carbon needed for a long-term CO2 evolution in the CO2-free air might not only be derived directly from the pool of intermediates in the Calvin cycle, but it might also arise indirectly from a remotely fixed reserve of photosynthates in the leaf via a PCO-mediated, yet to be further clarified, mobilization process. Such mobilization of photosynthates probably exerted an important role in coordination of photochemical reactions and carbon assimilation during photosynthesis in C3 plants under the photoinhibitory conditions. and Fusheng Xiong, Yuzhu Gao, Ping Song.

Language:

Multiple languages

Rights:

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

Coverage:

107-119

Source:

Photosynthetica | 1998 Volume:35 | Number:1

Harvested from:

CDK

Metadata only:

false