Protection of photosynthetic O2 evolution against heat inactivation: the role of chloride, pH and coupling status

Abstract

Heat inactivation of photosynthetic O2 evolution was studied in isolated thylakoids from spinach (Spinacia oleracea) and mangrove (Avicennia marina) leaves. Different temperatures, salt, pH and uncoupler effects were investigated. From these results and others in the literature it was concluced that chloride loss from the membrane and, more specifically, the oxygen-evolving complex of photosystem II, may be the cause of inhibition of oxygen evolution during heat inactivation.

Antioxidative responses in roots and shoots of creeping bentgrass under high temperature: Effects of nitrogen and cytokinin

“…Fu and Huang (2003) reported that additional foliar application of ammonium nitrate improved TQ and alleviated heat injury. This is consistent with our findings of TQ at d 28, with better TQ under high N compared to that under low N. Photosystem II is known to be sensitive to heat stress (Critchley and Chopra, 1988), with Fv/Fm decline being reported repeatedly in various plants under heat stress Zhao et al, 2008). Fv/Fm under high N at d 15 and d 28 were 17% and 15% higher than that under low N, respectively.…”

Effects of Nitrate and Cytokinin on Creeping Bentgrass Under Supraoptimal Temperatures

“…(Figures 1B, D). Photosystem II is known to be sensitive to heat stress (Critchley and Chopra, 1988), with Fv/Fm decline being reported repeatedly in various plants under heat stress Zhao et al, 2008). Heat stress promotes leaf senescence and degradation of Chl (Thomas and Stoddart, 1980).…”