Microscopic study of Lavandula Angustifolia Mill. New genotypes to identify structural indices with diagnostic role

Abstract

Introduction: New obtained genotypes of L. angustifolia require complex studies to determine the adaptive capacity to climatic conditions and the potential for volatile oils accumulation. Purpose: Microscopic study and highlighting of structural indices with diagnostic role in determining the adaptive and biosynthetic potential. Material and methods: Lavender plants micropreparations: hybrids – Fr.5S8-24 (1); Cr.13S-6-7 (2); Fr.8-5-15V (3); cultivars – Vis Magic 10 (4), Alba 7 (5), Moldoveanca 4 (6), Aroma Unica (7) and were analyzed under the microscope Micros . with camera. Results: The analysis of leaf micrographs of 7 new lavender genotypes, characterized by different maturation periods, allowed to highlight the structural indices to identify the potential of: 1) volatile oils accumulation – the development degree of octacellular glandular and secretory hairs (number/1cm2, distribution mode on epidermis, gland dimensions); mesophilic thickness and palisade/lacunar parenchyma thickness correlation; 2) adaptation to the stressors action: the thickness of cuticle, cell walls, epidermis, leaf blade and the thickness correlation of the upper/lower epidermis, epidermis/mesophilic; development degree of the protective trichomes, mechanical elements (sclerenchymal fibers, colenchyma) and the distribution. Conclusions: The highlighted structural indices will serve to identify new perspective genotypes for obtaining volatile oils with adaptogenic potential to the Moldova climatic conditions.