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Advisor(s)
Abstract(s)
Morphological characterization is one of the crucial assessments for differentiating between species and subspecies. In the genus Lavandula, hybridization and polymorphism phenomena occur naturally, which can make it difficult to classify species/subspecies. In this study, 120 specimens of Lavandula species were collected in eight locations in the Beira Interior region. The collection sites were Cebolais-Castelo Branco (CB), Penha Garcia (PG), Vila de Rei (VR), Ocreza-Castelo Branco (O), Vila Velha de Ródão (VV), Proença-a-Nova (PN), Penamacor (MC) and Oleiros (OL). In Ocreza, only specimens of Lavandula pedunculata were collected. In the remaining sites, aerial parts of plants of the L. stoechas complex were collected, to obtain a comprehensive representative collection of the gradient between the subspecies luisieri and stoechas. The necrodane (trans-α-necrodyl acetate) content in the essential oil of each specimen was quantified by GC-MS. For each specimen from eight sites, special data from ecological, edaphic, and physiographic characteristics were recovered. According to the morphological analysis, it is confirmed that in 120 specimens of the Stoechas complex collected between the eight sites, there are specimens with intermediate characteristics of the two subspecies. Two key morphological features are recognized for the distinction of the two subspecies, which are the spike length and width ratio and the peduncle and spike length ratio. The morphological analysis and genetic analysis allow us to separate the species of the Stoechas complex collected in the different places as follows: PN and VR are statistically different (p<0.05) from the specimens collected in the places CB, PG, and MC, and in turn, differences were found significant to the VV site. The two key morphological features allowed establishing a gradient between the two subspecies with ecological significance. Annual precipitation, temperature and altitude are key ecological variables explaining morphological variability. The quantification of necrodane compound was substantially lower in the VV site, which also presented a higher distance from the other sites, concerning morphology and genetics.
Description
Keywords
Lavandula stoechas complex morphological analysis necrodane compound ecology
Pedagogical Context
Citation
Domingues J., Ribeiro S., Coelho M.T., Barroca C., Canavarro C., Gonçalves J.C., Roque N. & Delgado F. 2022. Environmental and morphological traits in three sympatric Lavandula section stoechas. Comunicação oral. In: Ribeiro S.& Figueiredo A. (eds). 2022. A Ciência da Vegetação aplicada à gestão, conservação e restauro ecológico de habitats. Livro de Resumos do XII Encontro Internacional de Fitossociologia, pág. 64-65. PHYTOS - Associação Portuguesa de Ciência da vegetação, IPCB - Instituto Politécnico de Castelo Branco. 6 a 8 de setembro de 2022, C. Branco, Portugal. ISBN 978-989-333734
Publisher
PHYTOS – Associação Portuguesa de Ciência da vegetação, IPCB – Instituto Politécnico de Castelo Branco.