Blue radiation stimulates photosynthetic induction in Fagus sylvatica L.

Title:

Blue radiation stimulates photosynthetic induction in Fagus sylvatica L.

Creator:

Košvancová-Zitová, M., Urban, O., Navrátil, M., Špunda, V., Robson, T. M., and Marek, M. V.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:c7c13aca-e81e-484a-b130-3a90cfd4730e
uuid:c7c13aca-e81e-484a-b130-3a90cfd4730e
issn:0300-3604
doi:10.1007/s11099-009-0060-1

Subject:

blue, red ratio, electron transport, non-photochemical quenching, radiation quality, Rubisco activation, and transient limitations of photosynthesis

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

This study was designed to test the hypothesis that the spectral composition of incident radiation, as defined by the relative proportions of blue (B; λmax = 455 nm) and red (R; λmax = 625 nm) photons, can affect photosynthetic induction, since B photons stimulate stomatal opening and are more effectively absorbed by leaves than R photons. Different stages of photosynthetic induction, primarily determined by the photo-modulation of Rubisco activity and stomata opening, were investigated in dark-adapted leaves of Fagus sylvatica transferred to saturating irradiance [800µmol(photon) m-2 s-1] at B/R ratios of 1/3, 1/1, or 3/1. In agreement with our hypothesis, photosynthesis was induced faster by irradiance with a high B/R ratio (3/1); as demontrated by a higher IS60 (induction state 60 s after leaf illumination) and lower T 90 (the time period required to reach 90 % of maximum steady-state photosynthesis). However, there were no differences in induction between leaves receiving equal (1/1) and low (1/3) B/R ratios. Electron transport was highly sensitive to radiation quality, exhibiting faster induction kinetics with increasing B/R ratio. Such stimulation of carbon-assimilatory processes corresponds with faster activation of Rubisco and lower non-photochemical quenching (NPQ) as the proportion of B photons is increased. In contrast, the kinetics of stomatal opening was independent of the spectral composition of incoming radiation. Since slightly higher absorption efficiency of high B/R radiation does not fully explain the changes in induction kinetics, the other possible mechanisms contributing to the stimulation of electron transport and Rubisco activity are discussed. and M. Košvancová-Zitová ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

388-398

Source:

Photosynthetica | 2009 Volume:47 | Number:3

Harvested from:

CDK

Metadata only:

false