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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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Related references

Murkaite, R., 1973: Hybridization of some poplars from the section Leuce. In a study of 14 cross combinations involving Populus tremula, P. alba and P. tremuloides, the most promising for growth after four years were the hybrids obtained from P. tremuloides X P. tremula.

Ganchev, P., 1979: Hybridization of poplars of section Leuce. An account is given of hybrids obtained in Bulgaria by crossing Populus alba and P. tremula in 1964, and P. tremula and P. tremuloides in 1971-74. Data are given on growth rates, health (relative to infection by Melampsora spp.), and the anatomica...

Mohrdiek, O.; Melchior, G.H., 1976: Combined hybrid and polyploid breeding as a promising method for poplars of the section Leuce: comparison of diploid and triploid grey poplars of the same progenies. Progeny trials were planted at Schmalenbeck, W. Germany, in 1958 using clonal plants derived from either triploid or diploid progeny of 8 crosses between: a genetically anomalous grey poplar (Populus canescens) growing at Dillingen (as the pollen...

Lemoine M., 1986: Poplars of the section leuce. Revue Forestiere Francaise (Nancy) (SPEC ISSUE): 155-156

Kobendza, R., 1952: Poplars of the section Leuce in Poland.. Results of study of morphological variation especially in the shape of short-shoot leaves, in Populus tremula (I), P. alba (II), and P. canescens (III), all of them growing wild in the Vistula valley. Four main types of leaf-shape have been distin...

Frohlich, H.J.; Baumeister, G., 1963: Methods of identifying Poplars of the section Leuce.. From study of many clones of Populus alba, P.X canescens and P. tremula, presents descriptions and keys based on morphological, colour, and physiological characteristics. The method is similar to that for Black Poplars, but takes additional leaf a...

Bozic, J., 1967: Organographic studies on Poplars of the section Leuce. Gives details of morphometric studies on the 8 most valuable Slovenian parent trees (all males) of the section. The studies embraced crown and stem form, leaves and leaf buds, stem bark, catkins, and xylem vessel dimensions. From the statistically...

Jestaedt, M., 1975: Variety testing of poplars of the Leuce Section. Holzzucht 29 (2 4) 23-29

Janson, L., 1967: The vegetative propagation of Poplars of Section Leuce. cf. F.A. 24 No. 3580.] Briefly reports the results of investigations at the Warsaw Forest Research Institute into the influence of depth of planting, temperature and thickness of the cutting on the development of root cuttings, and of the age of t...

Morelet, M., 1985: Venturia of poplars of the section Leuce. I. Taxonomy. Cryptogamie: mycologie(2): 101-117