Abstract
At a particular location several natural and anthropogenic stress factors cause a pattern of stress which shows seasonal variations. With measurements of chlorophyll fluorescence, modifications in photochemical efficiency (Fv/Fm,) which often shows the earliest signs of stress, were determined on a daily as well as an annual basis. By the comparison of field measurements with laboratory measurements after recovery short term, long term and permanent stresses can be distinguished.
We have shown that stress of short duration is induced daily but can be species dependent in terms of time taken for recovery. This stress response may require the function of the xanthophyll cycle and may be based on a photoprotective, down regulating mechanism operating in PSII. Longer lasting stress such as occurs in winter (frost, photochilling) seems to reduce the amount of PSII but not of PSI, while any remaining PSII appears to function normally. Recovery from photochilling exhibited a fast phase, perhaps also based on pigment and reaction centre rearrangements, and a slow phase which may require more extensive metabolic and structural adjustments. All these stress responses have a photoinhibition component, whose mechanism remains to be explained. No straightforward relationship was seen between stressinduced changes in Fv/Fm and the velocity of Dl protein degradation, indicating that Dl turnover is not a stress-related metabolic response.
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Bolhar-Nordenkampf, H.R., Critchley, C., Haumann, J., Ludlow, M.M., Postl, W., Syme, A.J. (1994). Can Chlorophyll Fluorescence and P700 Absorption Changes Detect Environmental Stress?. In: Struik, P.C., Vredenberg, W.J., Renkema, J.A., Parlevliet, J.E. (eds) Plant Production on the Threshold of a New Century. Developments in Plant and Soil Sciences, vol 61. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1158-4_28
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DOI: https://doi.org/10.1007/978-94-011-1158-4_28
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