Abstract
Poplars from Aigeiros Duby section are very widespread in the world. A range of morphological characters were studied in such species of this section as Populus deltoides Bartram ex Marshall, P. nigra L. and their hybrid P. × canadensis Moench. However, there is little information about micromorphological characters of their leaves. The aim of this work was to study these characters and understand their species-specific potential. Thus, the morphological features, density and distribution of non-glandular trichoms, marginal glandular trichomes (salicoid teeth or coleters), epiglandular trichomes and basilaminar nectaries-glands were ontogenetically examined by both light and scanning electron microscopy in the certified by molecular markers P. deltoides, P. nigra and P. × canadensis samples. Non-glandular trichomes belong to the uni-, multicellular, uniseriate category. Marginal glandular trichomes can be classified as coleter types. Other morphological and anatomical trichome features are discussed with regard to their possible function. In summary, some variations in leaf morphology may be useful for the P. nigra, P. deltoides and their hybrid P. × canadensis species identification. These species differ in shape and number of basilaminar glands, as well as non-glandular trichome types and their distribution on the leaf.
Highlights
Populus nigra L. from Aigeiros Duby section is the most widespread Eurasian poplar
P. × canadensis species identification. These species differ in shape and number of basilaminar glands, as well as non-glandular trichome types and their distribution on the leaf
Primary ranges of P. nigra and P. deltoides Bartram ex Marshall do not overlap, but P. deltoides was introduced to Eurasia, and it produced fertile hybrids with P. nigra named P. × canadensis Sympatric species of the same section may freely cross and produce first-generation hybrids, which tend to last for decades, due to vegetative reproduction via root suckers or shoot layering
Summary
Populus nigra L. from Aigeiros Duby section is the most widespread Eurasian poplar. Primary ranges of P. nigra and P. deltoides Bartram ex Marshall (from the same section) do not overlap, but P. deltoides was introduced to Eurasia, and it produced fertile hybrids with P. nigra named P. × canadensis Sympatric species of the same section may freely cross and produce first-generation hybrids, which tend to last for decades, due to vegetative reproduction via root suckers or shoot layering. × canadensis Sympatric species of the same section may freely cross and produce first-generation hybrids, which tend to last for decades, due to vegetative reproduction via root suckers or shoot layering. Primary ranges of P. nigra and P. deltoides Bartram ex Marshall (from the same section) do not overlap, but P. deltoides was introduced to Eurasia, and it produced fertile hybrids with P. nigra named P. These hybrids may hybridize with one of the parents. Hybrids are often identified as one of the parent species, as the range of character variability in the species remains undefined
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