ROOTSTOCK INFLUENCE ON VIGOR AND GENERATIVE POTENTIAL OF YOUNG SWEET CHERRY TREES

The main goal of breeding and testing of rootstocks for sweet cherry is to obtain small and productive trees and to improve precocity. The objective of this study was to examine the influence of six rootstocks on vigor and productive characteristics of young sweet cherry trees. The experimental orchard is situated at the Experimental farm “Radmilovac”, of the Faculty of Agriculture (near Belgrade). Three sweet cherry cultivars: ‘Kordia’, ‘Karmen’ and ‘Regina’ were grafted on six rootstocks: Prunus mahaleb L. seedlings, ‘Colt’, ‘Ma×Ma 14’, ‘Gisela 6’, ‘Gisela 5’ and ‘Oblačinska’ sour cherry. During a two-year period (2015-2016) the following characteristics were studied: scion diameter above the grafting union, rootstock diameter under the grafting union, length and diameter of shoots, height of the tree and the number of spurs per tree. The resultsshowed different influence of rootstocks on the tree vigor, spur formation and precocity. The average diameter of the scion in all tested cultivars was the largest on the Mahaleb rootstock. The largest average number of spurs per tree in the second year was recorded on cherry trees grafted on the rootstocks ‘Gisela 6’ and ‘Oblačinska’ sour cherry (28 and 23 respectively). The lowest average number of spurs (6) was found on trees grafted on the rootstock ‘Colt’

Diffuse osteolytic lesions in leukemic transformation of myelofibrosis

Myelofibrosis is a clonal myeloproliferative disorder characterized by splenomegaly, abnormal deposition of reticulin and collagen in the bone marrow, extramedullary hematopoiesis, dacryocytosis and leukoerythroblastic blood smear. Development and sustainment of fibrosis are mediated by complex network of several cytokines. Osteosclerosis is the most frequently observed bone change in myelofibrosis. We present an atypical case of leukemic transformation in myelofibrosis associated with diffuse osteolytic lesions and extremely elevated lactate dehydrogenase in serum, which indicates high bone turnover during leukemic infiltration and bone destruction