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On the hybridization of the poplars of the section leuce

On the hybridization of the poplars of the section leuce

Gorskostopanska Nauka 16(3): 26-35

The investigations on hybridization are carried out with species from sect. Leuce. Elite plants are chosen and experimental plantations established. With respect to growth in height and diameter some of the hybrid plants tested manifest clearly expressed heterosis effect and in this respect they represent valuable initial selection material for establishing highly productive popular plantations in the foothills and in the mountain regions. Besides, the investigations show that a high percentage of the hybrid plants from the population Populus tremula .times. P. tremuloides are resistant to the leaf rust caused by Melampsora pinitorqua. Certain hybrid forms of P. alba .times. P. tremula manifest high ornamental value for green-belt setting of towns and suburban regions as well as industrial zones. Wood anatomy of certain hybrid forms from the population P. alba .times. P. tremula were studied to establish the length of the wood fibers and the percentage of the separate elements in the wood. Wood fiber length in certain hybrid plants are much bigger than that of the initial parental species. The percentage of the mechanical tissue is higher in hybrid plants which makes them more resistant to heart-rot. Hybridization of the species from the sect. Leuce appears to be promising for obtaining highly productive and disease resistant plants.

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