Levels of carbohydrates and chlorophyll fluorescence a leaves of acid lime trees 'Tahiti' subjected to girdling and ringing of branches

摘要

The aimed to study the dynamics of carbohydrates and chlorophyll fluorescence a in leaves of acid lime trees 'Tahiti' subjected to different times girdling and ringing of branches. It was studied four times the realization of girdling and ringing, with an additional treatment, without phloem interruption. The girdling, regardless of the time of realization, increased starch (55 to 90%) and soluble sugars levels (8 to 18%) in 'Tahiti' leaves until around 50 to 60 days. The ringing, regardless of achievement time, increased starch content (10 to 35%) to the control compared, but increase was less than to that which occurred in girdled plants (55 to 90%). The girdling promoted F0 increase and Fv/Fm ratio reduced, being the maximum (350) and minimum (0.78), respectively, were reached at about 60 days. For control and ringing plants, there was F0 increase, being the maximum value was achieved in 50 days (320), but lower than those observed for girdling, and there was no change in Fv/Fm ratio