Effect of Temperature and PFD on the Susceptibility of Leaves to Photoinhibition and Recovery
Leaves of many plants are susceptible to photoinhibition of photosynthesis. This results from exposure to photon flux densities (PFD) in excess of that normally experienced during growth and is manifest as a reduction in photosynthetic activity (1). However, photoinhibition can also occur when leaves are unable to utilise the available excitation energy through the effects of plant stress on photosynthesis, (2,3,4,5). The impact of this stress-induced photoinhibition on photosynthetic activity and consequent growth of plants is, however, largely unknown. However, willow leaves experienced about 10–20% photoinhibition under natural conditions throughout much of the growing season (6) and tropical fruit tree species become photoinhibited in cool winter conditions (7). By contrast, tropical grasses showed no evidence of photoinhibition in midsummer conditions (8). Therefore, little attention has been paid to defining conditions that make plants susceptible to photoinhibition. In this paper, the prevailing leaf environment and also the growth conditions that cause plants, but in particular Actinidia deliciosa (kiwifruit), to become susceptible to photoinhibition and those that influence the subsequent recovery, are addressed.
KeywordsLeaf Temperature Growth Light Actinidia Deliciosa Photon Flux Density Chronic Photoinhibition
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