Effect of Ringing on Root Starvation in Sour Orange Seedlings

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Abstract
Ringing one-year-old sour orange seedlings caused decreases in the starch level and respiration in the roots and in the level of NPK in the upper and lower parts of the plant. One month after ringing the decrease in starch level stopped and respiration rates returned to those of non-ringed seedlings. An addition of 10-4 M GA3 to the nutrient solution of non-ringed seedlings caused a rise in starch level in the main root; an addition of 10-6 or 10-5 M GA3, however, did not offset the decrease in starch level caused by ringing. Ringing did not interfere with the synthesis of starch from 14 C-sucrose added to the nutrient solution one month after ringing. Irrigation stress (and P deficiency in rough lemon seedlings) enhanced the ringing-induced decrease in starch level in the main root.