Some biological features of lavender and lavandin in relation with virus infection

S.V. Shevchenko, I.V. Mitrofanova
The article presents data from the analysis of pollen from individuals of lavender and lavandin infected with and free from Tobacco mosaic virus. Lavandula angustifolia L. is one of the valuable essential oil and ornamental plants. This is an evergreen shrub, 60-80 cm high with highly branched lower vegetative shoots and numerous young flowering shoots. In the Crimea lavender blossoms in June-August, flowers are full, bisexual, zygomorphic, collected in false whorls, forming spicate inflorescences. Corolla is not clearly bilabiate, up to 1 cm long, with large lobes, bluish-violet, pubescent. Calyx is tubular, 0.4-0.7 cm long, with prongs, densely pubescent, not falling. Pollen in lavender is 3-celled, 3-furrowed. In the total mass of pollen, studied cultivars in lavandin Lavandula × intermedia Emeric ex Loisel (‘Rabat’ and ‘Snezhny Bars’) and lavender L. angustifolia (‘Stepnaja’, ‘Belyanka’ and ‘Rannyaya’), the pollen grains can be of various sizes, full and sterile. When the ploidy of plants changes, the size of the pollen grains and the number of pores change. The content of morphologically normal pollen grains in the studied taxa ranges from 30 to 90%. The highest proportion of them, exceeding 90%, was noted in L. angustifolia and lavender of the ‘Rannyaya’ cultivar. The affection of the plants of lavender and lavandin by the virus Tobacco mosaic virus (TMV) led to the appearance of yellow spots on the leaves and their deformation, as well as to violations of internal processes of development of male generative structures. With the determined dependence of the formation of morphologically normal pollen grains from the genotype, the virus infection of individuals was particularly expressed in the anomalies and deficiency of the pollen grains.
Shevchenko, S.V. and Mitrofanova, I.V. (2021). Some biological features of lavender and lavandin in relation with virus infection. Acta Hortic. 1324, 173-178
DOI: 10.17660/ActaHortic.2021.1324.26
Lavandula angustifolia, Lavandula × intermedia, morphology, virus infection, generative sphere, pollen

Acta Horticulturae