caa a22 4500 475751760 CHVBK 20180406123525.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1023/A:1026546707649 doi (NATIONALLICENCE)springer-10.1023/A:1026546707649 ABA treatment increases both the desiccation tolerance of photosynthesis, and nonphotochemical quenching in the moss Atrichum undulatum [Elektronische Daten] [Richard Beckett, Zsolt Csintalan, Zoltán Tuba] Pulse amplitude modulation fluorescence was used to investigate whether abscisic acid (ABA) pretreatment increases the desiccation tolerance of photosynthesis in the moss Atrichum undulatum. In unstressed plants, ABA pretreatment decreased the F V/F m ratio, largely as a result of an increase in F o. This indicated a reduction in energy transfer between LHCII and PSII, possibly hardening the moss to subsequent stress by reducing the production of the reactive oxygen species near PSII. During desiccation, F 0, F m, F v/F m, ΦPSII, and NPQ and F 0 quenching declined in ABA-treated and nontreated mosses. However, during rehydration, F 0, F m, F v/F m, and ΦPSII recovered faster in ABA-treated plants, suggesting that ABA improved the tolerance of photosystemII to desiccation. NPQ increased upon rehydration in mosses from both treatments, but much more rapidly in ABA-treated plants; during the first hour of rehydration, NPQ was two-fold greater in plants treated with ABA. F 0quenching followed a similar pattern, indicating that ABA treatment stimulated zeaxanthin-based quenching. The implications of these results for the mechanisms of ABA-induced desiccation tolerance in A.undulatum are discussed. Kluwer Academic Publishers, 2000 Abscisic acid nationallicence Chlorophyll fluorescence nationallicence Desiccation nationallicence Moss nationallicence Beckett Richard School of Botany and Zoology, University of Natal, Pietermaritzburg, 3209, Scottsville, South Africa aut Csintalan Zsolt Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Sr. Istvan University, Gödöllõ, Hungary aut Tuba Zoltán Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Sr. Istvan University, Gödöllõ, Hungary aut Plant Ecology Kluwer Academic Publishers 151/1(2000-11-01), 65-71 1385-0237 151:1<65 2000 151 11258 https://doi.org/10.1023/A:1026546707649 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026546707649 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Beckett Richard School of Botany and Zoology, University of Natal, Pietermaritzburg, 3209, Scottsville, South Africa aut NATIONALLICENCE 700 1- Csintalan Zsolt Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Sr. Istvan University, Gödöllõ, Hungary aut NATIONALLICENCE 700 1- Tuba Zoltán Department of Botany and Plant Physiology, Faculty of Agricultural and Environmental Sciences, Sr. Istvan University, Gödöllõ, Hungary aut NATIONALLICENCE 773 0- Plant Ecology Kluwer Academic Publishers 151/1(2000-11-01), 65-71 1385-0237 151:1<65 2000 151 11258 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer