Exploring chromosome numbers and evaluation of some karyotypic characteristics of selected woody species from the Hyrcanian forests

Document Type : Research Paper

Authors

Botany Research Division, Research Institute of Forests and Rangelands, AREEO, Tehran, Iran.

10.22059/jfwp.2024.370296.1275

Abstract

Cytogenetic investigations in plant species, particularly wild and native plants, are crucial for understanding their evolutionary history, establishing species relationships, and determining karyological features. This study delves into chromosome counting and evaluation of karyotypic characteristics of five woody species belonging to three families: Ulmaceae, Cornaceae, and Rhamnaceae within the Hyrcanian Forests. Root tip meristem was used for chromosomal studies by classical methods. The results revealed that all studied species were diploid. The chromosome numbers of three species, Cornus australis (2n=2x=22), Rhamnus sintenisii (2n=2x=26), and Zelkova carpinifolia (2n=2x=28) were documented for the first time in the world. Additionally, two species of Ulmus glabra and U. minor with a chromosomal number (2n=2x=28) were reported for the first time in Iran. Concerning chromosomal length, R. sintenisii displayed the smallest chromosome length (0.9 µm), while U. glabra exhibited the largest (2.34 µm). The chromosomes in three species, R. sintenisii, U. glabra, and Z. carpinifolia were of the metacentric and sub-metacentric types. U. minor presented sub-telocentric chromosomes in addition to the mentioned types, and C. australis displayed metacentric chromosomes in two forms, M and m. Regarding symmetry, chromosomes in three species, R. sintenisii, U. minor, and Z. carpinifolia were classified as 2A, C. australis as 1A, and U. minor as 3A. Given the scarcity of similar studies on forest species, this research significantly contributes to identifying the cytogenetic characteristics of the examined species.

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References

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Forest and Wood Products
Volume 77, Issue 1
June 2024
Pages 23-33

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