Inhibition of photosynthesis by shift in the balance of excitation energy distribution between photosystems in dithiothreitol treated soybean leaves

Title:

Inhibition of photosynthesis by shift in the balance of excitation energy distribution between photosystems in dithiothreitol treated soybean leaves

Creator:

Jiang, C.-D., Gao, H.-Y., Zou, Q., and Jiang, G.-M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:41ed05d1-a4f1-4a18-afde-8b8b1170b8e5
uuid:41ed05d1-a4f1-4a18-afde-8b8b1170b8e5
issn:0300-3604
doi:10.1023/B:PHOT.0000046160.18482.91

Subject:

chlorophyll fluorescence, excitation energy distribution, net photosynthetic rate, photosystems, quenching, state transition, and xanthophyll cycle

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Chlorophyll fluorescence kinetics was used to investigate the effect of 1,4-dithiothreitol (DTT) on the distribution of excitation energy between photosystem 1 (PS1) and photosystem 2 (PS2) in soybean leaves under high irradiance (HI). The maximum PS2 quantum yield (Fv/Fm) was hardly affected by the presence of DTT, however, photon-saturated photosynthesis was depressed distinctly. Photochemical efficiency of open PS2 reaction centres during irradiation (Fv'/Fm') was enhanced by about 30-40 % by DTT treatment, whereas photochemical quenching (qP) was depressed by about 40 % under HI. DTT treatment caused a 30 % decrease in allocation of excitation energy to PS1 under HI and a 20 % increase to PS2. An obvious shift in the balance of excitation energy distribution between photosystems was observed in DTT-treated leaves. Though high excitation pressure (1 - qP) resulted from DTT treatment, non-photochemical quenching (qN) was lower. DTT completely inhibited the formation of zeaxanthin and also distinctly depressed the state transition (qT). The shift in the balance of excitation distribution between the two photosystems induced by DTT was mainly due to the enhancement of excitation energy capture by PS2 antenna and the inhibition of state transition. It might be the shift in the balance between the two photosystems that mainly induced the depression of photosynthesis. Thus, to keep high utilization efficiency of absorbed photon energy, it is necessary to maintain the balance of excitation distribution between PS2 and PS1. and C.-D. Jiang ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

409-415

Source:

Photosynthetica | 2004 Volume:42 | Number:3

Harvested from:

CDK

Metadata only:

false