Abstract
Heat-stress causes serious damages to plant, like as loss of photosynthetic activity and retardation of development. Here, we report that activation of NAD(P)H dehydrogenase is closely related to damage of photosynthetic activity in heat-stressed plants. When Arabidopsis plants were exposed to heat stress at 40C in the dark, Fv/Fm was rapidly decreased within a few hours. This decrease was due to release of oxygen-evolving 33 kDa protein. When NAD(P)H dehydrogenase (NDH)-deficient mutant (ndhO) was heat-treated, almost photosynthetic activity was maintained, suggesting that NDH might be closely related to heat-derived damage.
