Abstract
This paper reports on rootstock influence on plum tree winter-hardiness. Dry matter dynamic during winter in one-year-old shoots of plum trees was evaluated on Prunus domestica 'Victoria' plum (2n=6x=48) in 2008-2009, 2009-2010 and 2010-2011 in Pūre HRC, Latvia. Sixteen rootstocks ('St. Julien A', 'Brompton', 'Ackermann', 'Pixy', GF8/1, G5/22, GF655/2, 'Hamyra', 'St. Julien INRA2', 'St. Julien d'Orleans', 'St. Julien Noir', 'Brompton', 'Wangenheims Zwetche', 'St. Julien Wadenswil', 'Myrobalana', Pr. Cerasifera var. divaricate were planted in 2001 for comparison. Samples were taken 5 times over the wintering period and dry matter content (mg g-1) was determined. Dry matter content during 3 wintering periods showed significant increase during December and January. No significant effect of rootstock was recorded. The most fluctuating content of dry matter in one-year shoots was observed for trees grafted on 'Myrobalana' (496-541 mg g-1). More stable contents were detected in trees grafted onto Prunus cerasifera (495-507 mg g-1) and ‘Pixy’ (503-516 mg g-1). These results would suggest that the latter rootstocks are suitable for the more variable winter weather conditions.
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