ISHS Acta Horticulturae 349: V International Symposium on Orchard and Plantation Systems
PHOTOINHIBITION (LIGHT STRESS) IN CITRUS LEAVES |
| Authors: | E.E. Gussakovsky, E. Salomon, K. Ratner, Y. Shahak, A.R.J. Driesenaar, S. Malkin |
| Keywords: | photosynthesis, chlorophyll fluorescence |
| 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. | |
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