EFECT OF GIRDLING ON PHOTOSYNTHETIC ACTIVITY IN OLIVE LEAVES
Girdling at the base of peripheral branches on olive, cv. Leccino, done on 7 July 1987, 2 Nov. 1987 and 15 Feb. 1988, markedly reduced photosynthetic activity until the wound was completely healed. No reduction in photosynthesis occurred while the fruits were on the tree. Data indicate that the reduction of photosynthetic activity was correlated with the accumulation of starch. In effect, increase in stomatal resistance, corresponding to a decrease in photosynthesis, did not seem to be the cause for lower photosynthetic activity, because the concentration of intercellular CO2 in leaves of girdled branches was slightly higher with respect to the control. The fruits acted as a strong sink and so inhibited the accumulation of assimilates in the leaves. Simultaneous to photosynthetic inhibition, transpiration and chlorophyll and nitrogen contents decreased.
Proietti, P. and Tombesi, A. (1990). EFECT OF GIRDLING ON PHOTOSYNTHETIC ACTIVITY IN OLIVE LEAVES. Acta Hortic. 286, 215-218