Ola Al-Halabi*(1) Bayan Muzher(1) and Faisal Hamed(2)
(1). Pome and Grapevine Division, Sweida Research Center, General Commission for Scientific Agriculture Research (GCSAR), Damascus Syria.
(2). Faculty of Agriculture, Damascus University, Damascus, Syria.
(*Corresponding author: Dr. Ola Al-Halabi. E-Mail: ola_halabi@msn.com).
Received: 06/01/2018 Accepted: 23/03/2018
Abstract
This research was conducted at Pome and Grapevine Division in Sweida Research Center, GCSAR, during 2011-2012, to study growth characters and dynamic of five apple genotypes selected as rootstocks, through studying the changes in primary and secondary shoots length, and the number of leaves during the growth season, in addition to their length, leaves number and spiny shoots at the end of growth season of one year seedlings. The results showed differences among studied genotypes in growth dynamic during the growing season, and synchronization between structure units (primary and secondary shoots), this was clearly through significant values of auto and cross correlation coefficients, which correlated with the height and the decrease in growth rate according to the genotype. At the end of the growing season, the genotype S distinguished by highest average primary shoot of (77.9 cm) and secondary shoots (53.1 cm), these were in significant with genotype A. The differences in the average of total leaves number were insignificant among studied genotypes, and genotype B have significantly the highest number of spines on primary shoot (11 spines) with A, S and H, and on secondary shoots (13 spines) with C, S and H. Consequently, these results help to know the mechanism of rootstocks which affect the growth of cultivar scion.
Keyword: Apple Malus spp., Rootstock, Growth dynamic, Primary and secondary shoots.
Full Paper in Arabic: PDF