2019
Low temperature induced modulation of photosynthetic induction in non-acclimated and cold-acclimated Arabidopsis thaliana: chlorophyll a fluorescence and gas-exchange measurements
MISHRA, Kumud Bandhu; Anamika MISHRA; Jiri KUBASEK; Otmar URBAN; Arnd G. HEYER et. al.Basic information
Original name
Low temperature induced modulation of photosynthetic induction in non-acclimated and cold-acclimated Arabidopsis thaliana: chlorophyll a fluorescence and gas-exchange measurements
Authors
MISHRA, Kumud Bandhu (356 India, guarantor, belonging to the institution); Anamika MISHRA; Jiri KUBASEK; Otmar URBAN; Arnd G. HEYER and A. GOVINDJEE
Edition
PHOTOSYNTHESIS RESEARCH, DORDRECHT, SPRINGER, 2019, 0166-8595
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10511 Environmental sciences
Country of publisher
Netherlands
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 3.216
RIV identification code
RIV/00216224:14310/19:00113505
Organization unit
Faculty of Science
UT WoS
000458553100010
EID Scopus
2-s2.0-85055329742
Keywords in English
Low-temperature effect; Cold acclimation; Chlorophyll fluorescence transients; Slow SMT fluorescence phase; Gas-exchange measurements; State transition; 3-(3.4-dichlorophenyl)-1. 1-dimethylurea; Methyl viologen
Tags
Tags
International impact, Reviewed
Changed: 2/4/2020 12:10, Mgr. Marie Novosadová Šípková, DiS.
Abstract
In the original language
Cold acclimation modifies the photosynthetic machinery and enables plants to survive at sub-zero temperatures, whereas in warm habitats, many species suffer even at non-freezing temperatures. We have measured chlorophyll a fluorescence (ChlF) and CO2 assimilation to investigate the effects of cold acclimation, and of low temperatures, on a cold-sensitive Arabidopsis thaliana accession C24. Upon excitation with low intensity (40 mu mol photons m(-2) s(-1))620nm light, slow (minute range) ChlF transients, at 22 degrees C, showed two waves in the SMT phase (S, semisteady-state; M, maximum; T, terminal steady-state), whereas CO2 assimilation showed a linear increase with time. Low-temperature treatment (down to -1.5 degrees C) strongly modulated the SMT phase and stimulated a peak in the CO2 assimilation induction curve. We show that the SMT phase, at 22 degrees C, was abolished when measured under high actinic irradiance, or when 3-(3, 4-dichlorophenyl)-1, 1- dimethylurea (DCMU, an inhibitor of electron flow) or methyl viologen (MV, a Photosystem I (PSI) electron acceptor) was added to the system. Our data suggest that stimulation of the SMT wave, at low temperatures, has multiple reasons, which may include changes in both photochemical and biochemical reactions leading to modulations in non-photochemical quenching (NPQ) of the excited state of Chl, state transitions, as well as changes in the rate of cyclic electron flow through PSI. Further, we suggest that cold acclimation, in accession C24, promotes state transition and protects photosystems by preventing high excitation pressure during low-temperature exposure.