Articles
PHOTOINHIBITION (LIGHT STRESS) IN CITRUS LEAVES
Article number
349_20
Pages
139 – 144
Language
Abstract
The susceptibility of citrus leaves to artificially induced photoinhibition was studied.
Detached leaves were subjected to illumination by white light at 5 C. The resulting change in the photochemical quantum yield (probed by chlorophyll fluorescence parameters) was measured as the indication of photoinhibition.
The main results were: (i) within the range of 500–5400 uEinstein/s per sq.m of photosynthetically active radiation the photoinhibition increased linearily, depending on the total light fluence rather than on fluence rate; (ii) eight different citrus cultivars were equally susceptible to photoinhibition; (iii) "shade" leaves were more sensitive to photoinhibition than "sun" leaves; (iv) young developing leaves were extremely vulnerable.
The possible implications to orchards are discussed.
Detached leaves were subjected to illumination by white light at 5 C. The resulting change in the photochemical quantum yield (probed by chlorophyll fluorescence parameters) was measured as the indication of photoinhibition.
The main results were: (i) within the range of 500–5400 uEinstein/s per sq.m of photosynthetically active radiation the photoinhibition increased linearily, depending on the total light fluence rather than on fluence rate; (ii) eight different citrus cultivars were equally susceptible to photoinhibition; (iii) "shade" leaves were more sensitive to photoinhibition than "sun" leaves; (iv) young developing leaves were extremely vulnerable.
The possible implications to orchards are discussed.
Authors
E.E. Gussakovsky, E. Salomon, K. Ratner, Y. Shahak, A.R.J. Driesenaar, S. Malkin
Keywords
photosynthesis, chlorophyll fluorescence
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