Format

Send to

Choose Destination
See comment in PubMed Commons below
PLoS One. 2014 May 14;9(5):e97322. doi: 10.1371/journal.pone.0097322. eCollection 2014.

Exogenous calcium alleviates low night temperature stress on the photosynthetic apparatus of tomato leaves.

Author information

1
Horticulture Department, Shenyang Agricultural University, Shenyang, Liaoning Province, China; Key Laboratory of Protected Horticulture of Ministry of Education, Shenyang, Liaoning Province, China; Key Laboratory of Protected Horticulture of Liaoning Province, Shenyang, Liaoning Province, China.

Abstract

The effect of exogenous CaCl2 on photosystem I and II (PSI and PSII) activities, cyclic electron flow (CEF), and proton motive force of tomato leaves under low night temperature (LNT) was investigated. LNT stress decreased the net photosynthetic rate (Pn), effective quantum yield of PSII [Y(II)], and photochemical quenching (qP), whereas CaCl2 pretreatment improved Pn, Y(II), and qP under LNT stress. LNT stress significantly increased the non-regulatory quantum yield of energy dissipation [Y(NO)], whereas CaCl2 alleviated this increase. Exogenous Ca2+ enhanced stimulation of CEF by LNT stress. Inhibition of oxidized PQ pools caused by LNT stress was alleviated by CaCl2 pretreatment. LNT stress reduced zeaxanthin formation and ATPase activity, but CaCl2 pretreatment reversed both of these effects. LNT stress caused excess formation of a proton gradient across the thylakoid membrane, whereas CaCl2 pretreatment decreased the said factor under LNT. Thus, our results showed that photoinhibition of LNT-stressed plants could be alleviated by CaCl2 pretreatment. Our findings further revealed that this alleviation was mediated in part by improvements in carbon fixation capacity, PQ pools, linear and cyclic electron transports, xanthophyll cycles, and ATPase activity.

PMID:
24828275
PMCID:
PMC4020824
DOI:
10.1371/journal.pone.0097322
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments

    Supplemental Content

    Full text links

    Icon for Public Library of Science Icon for PubMed Central
    Loading ...
    Support Center