ABA treatment increases both the desiccation tolerance of photosynthesis, and nonphotochemical quenching in the moss Atrichum undulatum
作者： Richard P Beckett , Zsolt Csintalan , Zoltán Tuba
关键词: Botany 、 Photosystem II 、 Moss 、 Abscisic acid 、 Chlorophyll fluorescence 、 Photosynthesis 、 Biology 、 Desiccation 、 Desiccation tolerance 、 Zeaxanthin
摘要: Pulse amplitude modulation fluorescence was used to investigate whether abscisic acid (ABA) pretreatment increases the desiccation tolerance of photosynthesis in moss Atrichum undulatum. In unstressed plants, ABA decreased FV/Fm ratio, largely as a result an increase Fo. This indicated reduction energy transfer between LHCII and PSII, possibly hardening subsequent stress by reducing production reactive oxygen species near PSII. During desiccation, F0, Fm, Fv/Fm, ΦPSII, NPQ F0 quenching declined ABA-treated nontreated mosses. However, during rehydration, ΦPSII recovered faster suggesting that improved photosystem II desiccation. increased upon rehydration mosses from both treatments, but much more rapidly plants; first hour two-fold greater plants treated with ABA. F0quenching followed similar pattern, indicating treatment stimulated zeaxanthin-based quenching. The implications these results for mechanisms ABA-induced A. undulatum are discussed.
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