Morphological and anatomical evolution of species of Valeriana (Caprifoliaceae) during the uplift of the Andean range

0575418 - BÚ 2024 RIV US eng J - Journal Article
da Silva Cruz, Rafael - Klimeš, Adam - Doležal, Jiří - Sklenář, P. - Klimešová, Jitka
Morphological and anatomical evolution of species of Valeriana (Caprifoliaceae) during the uplift of the Andean range.
Botanical Journal of the Linnean Society. Roč. 203, č. 1 (2023), s. 50-66. ISSN 0024-4074. E-ISSN 1095-8339
R&D Projects: GA MŠMT LTAUSA18007
Grant - others:AV ČR(CZ) AP2004
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:67985939
Keywords : Valeriana * growth forms * Anatomy * evolution
OECD category: Plant sciences, botany
Impact factor: 2.4, year: 2022
Method of publishing: Limited access
https://doi.org/10.1093/botlinnean/boad011

Andean species of Valeriana are frequently pointed to as an example of island woodiness, i.e. plants with herbaceous ancestors that usually evolve woodier forms on islands. We investigated this phenomenon through morphoanatomical and phylogenetic analyses. Plants were collected in the Paramos of Ecuador and had their vegetative morphology described. Stems were sectioned for histological analyses. We mapped the morphoanatomical data plus the maximum reported size for these and other species of the genus, on phylogenetic trees reconstructed on the basis of previously published sequences. Bigger than their Holarctic counterparts, the ancestor of the South American Valeriana was likely to have had a maximum size of 132 cm, and then after evolved to bigger and smaller sizes in a pattern similar to Brownian motion, as supported by phylogenetic signal values. We classified the collected plants into six growth forms (rosette herbs, semirosette herbs, elevated rosettes, elevated semirosettes, shrubs, and lianas), that are not directly related to variable levels of woodiness, as pointed out by our histological analyses. However, the production of unlignified parenchyma in the wood is very frequent, except in older regions of shrubs. The ancestor of the South American Valeriana is also very likely to have unlignified parenchyma in its wood.
Permanent Link: https://hdl.handle.net/11104/0346490