Chromosome banding and essential oils composition of Brazilian accessions of <Emphasis Type="Italic">Lippia alba</Emphasis> (Verbenaceae) |
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Authors: | Saulo M Sousa Pâmela S Silva Giovana A Torres Lyderson F Viccini |
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Institution: | (1) Departamento de Biologia, Universidade Federal de Lavras (UFLA), 37200-000 Lavras, Minas Gerais, Brazil;(2) Departamento de Biologia, Instituto de Cięncias Biológicas, Universidade Federal de Juiz de Fora (UFJF), 36036-900 Juiz de Fora, Minas Gerais, Brazil |
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Abstract: | The essential oil components and a karyotypic analysis of five Lippia alba (Verbenaceae) accessions from Brazil were performed with the objective of investigating the variation among different populations.
The chemistry analysis allowed the grouping of the accessions in two main chemotypes: neral chemotype (LaCat, LaJF and LaRJ)
and linalool chemotype (LaGua and LaVC). However, large karyotypic differences, verified by different chromosome banding techniques,
were not detected. The results presented the same chromosome number for all accessions (2n = 30) with 10 metacentric chromosomes and 5 submetacentric. The chromosome banding showed great blocks of constitutive heterochromatin
(C-bands) around the centromeric region, which was rich in AT bases (DAPI+), while the CMA bands were observed only in terminal regions of six chromosomes. Through Ag-NOR techniques, only two active
pairs of NORs were detected on the three pairs of secondary constrictions (the NOR activity is discussed). This work relates
the pattern of heterochromatin for Lippia alba for the first time. |
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Keywords: | Lippia alba Ag-NOR chemotypes chromosome banding fluorochromes Verbenaceae |
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