Photosynthetic electron transport, photophosphorylation, and antioxidants in two ecotypes of reed (Phragmites communis Trin.) from different habitats

Title:

Photosynthetic electron transport, photophosphorylation, and antioxidants in two ecotypes of reed (Phragmites communis Trin.) from different habitats

Creator:

Zhu, X. Y., Chen, G. C., and Zhang, C. L.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:1431c6fe-2a83-4d5d-871d-e86a21ad2b64
uuid:1431c6fe-2a83-4d5d-871d-e86a21ad2b64
issn:0300-3604
doi:10.1023/A:1013766722604

Subject:

antioxidant, ascorbate peroxidase, chloroplast, cyclic electron flow, Mg2+-ATPase, natural drought, photosystem 1 and 2 activities, stomatal resistance, superoxide dismutase, and transpiration rate

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We compared chloroplast photochemical properties and activities of some chloroplast-localised enzymes in two ecotypes of Phragmites communis, swamp reed (SR, C3-like) and dune reed (DR, C4-like) plants growing in the desert region of north-west China. Electron transport rates of whole electron transport chain and photosystem (PS) 2 were remarkably lower in DR chloroplasts. However, the electron transport rate for PS1 in DR chloroplasts was more than 90 % of the activity similar in the SR chloroplasts. Activities of Mg2+-ATPase and cyclic and non-cyclic photophosphorylations were higher in DR chloroplasts than in the SR ones. The activities of chloroplast superoxide dismutase (SOD) and ascorbate peroxidase (APX), both localised at or near the PS1 complex and serving to scavenge active oxygen around PS1, and the content of ascorbic acid, a special substrate of APX in chloroplast, were all higher in DR chloroplasts. Hence reed, a hydrophytic plant, when subjected to intense selection pressure in dune habitat, elevates its cyclic electron flow around PS1. In consequence, it provides extra ATP required by C4 photosynthesis. Combined high activities of active oxygen scavenging components in DR chloroplasts might improve protection of photosynthetic apparatus, especially PS1, from the damage of reactive oxygen species. This offers new explanation of photosynthetic performance of plant adaptation to long-term natural drought habitat, which is different from those, subjected to the short-term stress treatment or even to the artificial field drought. and X. Y. Zhu, G. C. Chen, C. L. Zhang.

Language:

Multiple languages

Rights:

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

Coverage:

183-189

Source:

Photosynthetica | 2001 Volume:39 | Number:2

Harvested from:

CDK

Metadata only:

false