Increase in resistance to low temperature photoinhibition following ascorbate feeding is attributable to an enhanced xanthophyll cycle activity in rice (Oryza sativa L.) leaves

Title:

Increase in resistance to low temperature photoinhibition following ascorbate feeding is attributable to an enhanced xanthophyll cycle activity in rice (Oryza sativa L.) leaves

Creator:

Xu, C.-C., Lin, R.-C., Li, L.-B., and Kuang, T.-Y.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:d75f7b45-21ae-4279-b27a-d8c3aab65367
uuid:d75f7b45-21ae-4279-b27a-d8c3aab65367
issn:0300-3604
doi:10.1023/A:1007269931946

Subject:

antheraxanthin, chilling, chlorophyll fluorescence, high irradiance, photochemical quenching, thermal energy dissipation, violaxanthin, and zeaxanthin

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The mechanistic basis for protection of exogenous ascorbate against photoinhibition at low temperature was examined in leaves of rice (Oryza sativa L.). Exposure of intact leaves to chilling temperature resulted in a drastic decrease in the speed of development of non-photochemical fluorescence quenching (NPQ). This was related to the low temperature-imposed restriction on the formation of the fast relaxing component of NPQ (qf). Feeding with 20 mM ascorbate markedly increased the rate of qf development at chilling temperature due primarily to the enhanced rate of zeaxanthin (Z) formation. On the other hand, ascorbate feeding had no influence on photosystem 2 (PS2)-driven electron flow. The reduced state of the PS2 primary electron acceptor QA decreased in ascorbate-fed leaves exposed to high irradiance at chilling temperature owing to the increased Z-associated thermal energy dissipation in the light-harvesting antenna system of PS2. Furthermore, ascorbate feeding increased the photosynthetic apparatus of rice leaves to resist photoinhibition at low temperature. The protective effect of exogenous ascorbate was fully accounted for by the enhanced xanthophyll cycle activity. and C.-C. Xu ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

221-226

Source:

Photosynthetica | 2000 Volume:38 | Number:2

Harvested from:

CDK

Metadata only:

false