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Spontaneous hybridization of Populus × sibirica and Populus nigra in the city of Novokuznetsk (Kemerovo region)

2017; Altay State University; Volume: 20; Issue: 4 Linguagem: Inglês

10.14258/turczaninowia.20.4.19

1560-7267

Б. В. Прошкин, А. В. Климов,

Agricultural Productivity and Crop Improvement

The wide distribution in the culture of adventitious species of the genus Populus and numerous cultivars of hybrid origin, especially in urban areas, leads to their contact with populations of native species, thus providing opportunities for the penetration of exotic genes into natural gene pools. In Siberia, the most common exotic species is P. × sibirica. Cultivar has been widely used for a long time in gardening and protective reforestation and its plantations often contact populations of native species. The origin of P. × sibirica remains unclear, which is due to the lack of molecular genetic studies and insufficient knowledge of its morphological polymorphism. Probably, it is a spontaneous polyhybrid that has arisen in the crossing of species of sections Aigeiros and Tacamahaca. The results of studying the recorded anthropogenic hybridization of P. × sibirica and natural P. nigra in Novokuznetsk are presented. Morphological analysis of Siberian, black poplars and their hybrid progeny is carried out. It has been established that the most important feature for the identification of hybrids is the differentiation of crown shoots, and even with the external similarity of the leaf blade with P. nigra, they always display discoblasts. Last confirms that in hybrids of poplars arising when crossing between species of Aigeiros and Tacamahaca sections, differentiation of crown shoots are inherited from balsamic poplars. Probably, this feature is controlled by extranuclear genes. The problems of anthropogenic hybridization in species of the genus and its consequences for populations of native species are discussed. The situation with the prediction of introgression of exotic genes in the population of local poplar species in the floodplain of the river Tom' is complicated by the presence here of its natural hybridization zone between P. nigra and P. laurifolia.