The optimum temperature window for leaf C-export in the light is narrower than that for C-fixation

摘要

Heat or cold "stress" can be defined as a change in temperature that exerts a negative influence on plant growth. Attempts to quantify stresses ultimately demand a measure of the plant's fitness to cope with the challenge. A change in photosynthesis(Pn) frequently reflects changes in plant growth (S17-025). Plants tolerate sustained temperature stresses differently. A rise in air temperature above the optimal for a cool-season crop, pea, may not affect thedevelopment of the more heat-tolerant pepper plant. Similarly, decreased air temperature can also induce stress conditions and tolerance to them. In the late summer and fall sustained lower ambient temperatures will inhibit Pn in many plants yet some perennials acclimate or "harden" to be able to tolerate the stresses imposed by cold and light (see Savitch et al. 2000 and S35-020).