Underestimate of PS2 efficiency in the field due to high leaf temperature resulting from leaf clipping and its amendment

Title:

Underestimate of PS2 efficiency in the field due to high leaf temperature resulting from leaf clipping and its amendment

Creator:

Weng, J.-H.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:2cbe7029-8395-4af8-9347-3c4067b54795
uuid:2cbe7029-8395-4af8-9347-3c4067b54795
issn:0300-3604
doi:10.1007/s11099-006-0052-3

Subject:

chlorophyll fluorescence, leaf clip, leaf temperature, irradiance, Oryza, photosystem 2 efficiency, and rice

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Chlorophyll fluorescence parameter Fv/Fm, an indicator of the maximum efficiency of PS2, is routinely measured in the field with plant leaves darkened by leaf clips. I found that on a sunny day of subtropical summer, the Fv/Fm ratio was often underestimated because of a large F0 value resulted from a high leaf temperature caused by clipping the leaf under high irradiance, especially for long (e.g. 20 min) duration. This phenomenon may overestimate the down-regulation of PS2 efficiency under high irradiance. When leaf temperature was lower than 40 °C, the F0 level of rice leaves under clipping remained practically unchanged. However, F0 increased drastically with leaf temperature rising over 40 °C. In most measurements, no significant difference in Fm was found between rice leaves dark-adapted by leaf clips for 10 min and for 20 min. Therefore, shading leaf clips to prevent a drastic increase of leaf temperature, using F0 measured immediately after the leaf being darkened to calculate Fv/Fm, as well as shortening the duration of leaf clipping are useful means to avoid an underestimate of Fv/Fm.

Language:

Multiple languages

Rights:

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

Coverage:

467-470

Source:

Photosynthetica | 2006 Volume:44 | Number:3

Harvested from:

CDK

Metadata only:

false