Estimation of photorespiration rate by simultaneous measurements of CO2, gas exchange rate, and chlorophyll fluorescence quenching in the C3 plant Vigna radiata (L.) Wilczek and the C4 plant Amaranthus mongostanus L.

Title:

Estimation of photorespiration rate by simultaneous measurements of CO2, gas exchange rate, and chlorophyll fluorescence quenching in the C3 plant Vigna radiata (L.) Wilczek and the C4 plant Amaranthus mongostanus L.

Creator:

Yoshimura, Y., Kubota, F., and Hirao, K.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:f286d103-b983-4ac0-a627-945bccc0adeb
uuid:f286d103-b983-4ac0-a627-945bccc0adeb
issn:0300-3604
doi:10.1023/A:1015178209845

Subject:

electron transport rate, photosynthesis, photosystem 2, mungbean, and quantum yield

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

So far the photorespiration rate (RP) in a leaf has been determined as the difference between the net photosynthetic rates (PN) measured in 21 % O2 air (PN21%) and 3 % O2 air (PN3%). In the C3 plant Vigna radiata and the C4 plant Amaranthus mongostanus L., PN and chlorophyll fluorescence quenching in leaves were monitored simultaneously. RP of leaves in situ was estimated as termed RPE from the electron transport rates through photosystem 2 (PS2), and compared with RPO (PN3% - PN21%). In V. radiata RPO was 11.9 µmol(CO2) m-2 s-1 and the ratio of RPO to PN21% was 42.2 %, whereas the ratio of RPE to PN21% was 25.7 %. This suggests that RPO may be over-estimated for the real RP in normal air. In A. mongostanus, PN was almost not changed with a decrease in O2 concentration from 21 to 3 %, whereas the quantum yield of PS2 was evidently affected by the change in O2 concentration. This fact shows the presence of photorespiration in this C4 species, where RPE was equivalent to 3.8 % of PN21%. and Y. Yoshimura, F. Kubota, K. Hirao.

Language:

Multiple languages

Rights:

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

Coverage:

377-382

Source:

Photosynthetica | 2001 Volume:39 | Number:3

Harvested from:

CDK

Metadata only:

false