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WITCHES' BROOM OF ALEPO PINE (PINUS HALEPENSIS MILL.) AND ITS USE FOR NEW ORNAMENTALS

2002; International Society for Horticultural Science; Issue: 572 Linguagem: Inglês

10.17660/actahortic.2002.572.23

2406-6168

Petar Vrgoč,

Sensory Analysis and Statistical Methods

The aim of this research was to select new cultivars among Pinus halepensis Mill. Witches’ Broom progenies. The most compact Witches’ Broom-3 had the smallest shoots, cones and seeds. Witches’ Broom-1 was slightly less compact with slightly larger shoots, cones and seeds. Witches’ Broom-2 was the least compact with larger shoots, cones and seeds. Significant differences (p ≤ 0.01) were found for the number of shoots per node, shoot length, needle length, length and width of cones and length and width of seeds between the three different Witches’ Brooms and between the Witches’ Brooms and normal crowns. The denser the Witches’ Broom crown, the denser and shorter were the shoot lengths and lengths and widths of its cones and seeds, while the number of shoots per node was larger. As a result of Cluster analyses and graphical analyses of cluster means of 3 clustering variables, it was determined that height, internode length and number of branches per 1-cm were quantitative characters of Witches’ Brooms and normal progenies. As the Witches’ Brooms only have female flowers, pollination occurred by the normal crown of the same tree or neighbouring trees. The inheritance from Witches’ Broom has gone into segregation resulting in smaller heights and smaller internode lengths than the same characteristics obtained by segregation of normal progeny originating from the normal crown of the same tree. Cluster analyses appeared to be very suitable for cluster recognition among Witches’ Broom or normal progeny for the purpose of quantitative inheritance confirmation. Among Witches’ Brooms progenies 12 plants were selected of different shapes: globosus, procumbens, pyramidalis, ovalis and divaricatus.