Journal Article

Differences in the responses of photosystem I and photosystem II of three tree species <i>Cleistanthus sumatranus</i>, <i>Celtis philippensis</i> and <i>Pistacia weinmannifolia</i> exposed to a prolonged drought in a tropical limestone forest

Wei Huang, Pei-Li Fu, Yan-Juan Jiang, Jiao-Lin Zhang, Shi-Bao Zhang, Hong Hu and Kun-Fang Cao

Edited by Jörg-Peter Schnitzler

in Tree Physiology

Volume 33, issue 2, pages 211-220
Published in print February 2013 | ISSN: 0829-318X
Published online January 2013 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/tps132
Differences in the responses of photosystem I and photosystem II of three tree species Cleistanthus sumatranus, Celtis philippensis and Pistacia weinmannifolia exposed to a prolonged drought in a tropical limestone forest

Show Summary Details

Preview

Drought stress can induce closure of stomata, thus leading to photoinhibition. The effects of prolonged severe drought under natural growing conditions on photosystem I (PSI), photosystem II (PSII) and cyclic electron flow (CEF) in drought-tolerant tree species are unclear. In spring 2010, southwestern China confronted severe drought that lasted several months. Using three dominant evergreen species, Cleistanthus sumatranus (Miq.) Muell. Arg. (Euphorbiaceae), Celtis philippensis Bl. (Ulmaceae) and Pistacia weinmannifolia J. Poisson ex Franch. (Anacardiaceae) that are native to a tropical limestone forest, we investigated the influence of this stress on PSI and PSII activities as well as light energy distribution in the PSII and P700 redox state. By the end of the drought period, predawn leaf water potential (Ψpd) largely declined in each species, especially in C. sumatranus. Photosystem I activity strongly decreased in the three species, especially in C. sumatranus which showed a decrease of 65%. The maximum quantum yield of PSII after dark adaptation remained stable in P. weinmannifolia and C. philippensis but significantly decreased in C. sumatranus. Light response curves indicated that both linear electron flow and non-photochemical quenching were severely inhibited in C. sumatranus along with disappearance of CEF, resulting in deleterious excess light energy in PSII. We conclude that PSI is more sensitive than PSII to prolonged severe drought in these three drought-tolerant species, and CEF is essential for photoprotection in them.

Keywords: cyclic electron flow; drought stress; non-photochemical quenching; photoinhibition; photosystem I; photosystem II

Journal Article.  6216 words.  Illustrated.

Subjects: Plant Sciences and Forestry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.