THE MEASUREMENTS OF STARCH AND TOTAL SUGARS CONTENT IN SOME GRAPEVINE VARIETIES (VITIS VINIFERA L.) DURING DORMANCY THROUGH DIFFERENT METHODS

Two extraction and measurement methods usually employed to analyze the total sugar and starch contents in plant tissues were investigated with the view to streamlining the process of total sugar and starch determination. Seven- yearold grapevines (table grapes varieties - 'Muscat de Hamburg', 'Napoca', 'Cardinal', 'Perla of Csaba', and wine varieties - 'Feteasca regala', 'Muscat Ottonel', 'Pinot noir', and 'Feteasca neagra') were marked before winter. During dormancy (October-February), starch level in canes was appreciated through iodine in the potassium iodide method and the anthrone method, both methods using the same biological material (grape canes). Through the anthrone method, the soluble sugars, starch, and total carbohydrates were quantified as g % dry substance. Among the used methods, there were similarities regarding the results. The presented selected methods for starch content determination in plant materials are commonly used and sufficiently accurate in measurements made of engineering works.