作者: A. S. Verhoeven , W. W. Adams , B. Demmig‐Adams
DOI: 10.1046/J.1365-3040.1998.00338.X
关键词:
摘要: Seasonal differences in PSII efficiency (F v /F m ), the conversion state of xanthophyll cycle (Z + A)/(V A Z), and leaf adenylate status were investigated Euonymus kiautschovicus. On very cold days winter, F assessed directly field remained low Z high throughout day night both sun shade leaves. Pre-dawn transfer leaves from subfreezing temperatures to room temperature revealed that recovery (increases violaxanthin) consisted one, rapid phase leaves, whereas a was followed by slow requiring The pre-dawn ATP/ADP ratio, as well determined at midday, similar when comparing overwintering with those sampled summer, although levels ATP ADP elevated all during winter relative summer. After natural transition warmer had returned values typical for intermediate between summer day. Thus two distinct forms sustained +A)-dependent energy dissipation identified based upon their differing characteristics. form on but relaxed rapidly warming occurred may result maintenance lumenal pH responsible nocturnal engagement A)-dependent thermal exclusively winter. even correlated +A violaxanthin only represent associated an altered protein composition In latter, warm-sustained form, uncoupler or cycloheximide infiltration no effect recovery, lincomycin inhibited increase violaxanthin.