Dynamics of carbohydrates in fruiting branches of apricot cultivars during dormancy
2005
Djurovic, D.,Poljoprivredni fakultet, Beograd - Zemun (Serbia)
The paper presents the results of evaluation of sugar and starch contents both in fruiting branches (bark and wood) and flower buds in 12 apricot cultivars during dormancy (winter of 1998-1999 and 1999-2000), along with their dynamics. Evaluation of basic phenological properties of the cultivars (beginning of vegetation, flowering, shedding) has also been performed. Content of sugars is the highest in flower buds (2.68%), and the smallest in the wood of the fruiting branches (1.24%), whereas the rate of starch is the highest in the wood of the fruiting branches (3.35%) and the lowest in the bark (1.86%). Cultivars Zamorozoustojcivij, Magyar kajszi, Cegledi orijas and Kostjuzenskij, which had high sugar content during winter (exceeding 2.20%), exhibited substantial decrease in starch content (up to 50%), both in flower buds and wood, during December and January. In contrast to them, in cvs Krasnij Partizan, Stark early Orange, Jubilarna and Bergeron starch content was lower for only 10% during the same period which resulted in low sugar content. On the basis of these evaluations it may be inferred that the cultivars of the first group exhibit better ecological adaptability to frost compared to the other one.
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