Pubescence of vegetative organs and trichome micromorphology in some Boraginaceae at different ontogenetic stages

Barykina, R.; Alyonkin, V.

Авторы: Rimma Barykina, Vitaly Alyonkin
Журнал: Wulfenia
Том: 23
Год издания: 2016
Издательство: Botanischer Garten des Landes Karnten
Местоположение издательства: Austria
Первая страница: 1
Последняя страница: 29
Аннотация: The paper presents the ontogenetic investigation of 16 herbaceous (annual, biennial and perennial) representatives of Boraginaceae. Special attention is paid to the pubescence of vegetative organs and to trichome micromorphology. The hairs have been revealed to be formed at early ontogenetic stages. Two hair types, represented by seven forms, as well as six types of pubescence were identified. Trichome surface ultrasculpture is used as an additional trait particularizing the pubescence characters. The correlation between the pubescence of vegetative organs and heteroeremocarpy, common for Boraginaceae, is noted for the first time. Within a species, some seasonal forms can change their pubescence type whereas other ones are stable and keep their types at all ontogenetic stages. Data proving the presence of cystolith-bearing hairs in Boraginaceae are given. Possible ways of and reasons for cystolith body formation are suggested. Pubescence studies in vegetative organs of virginile and definitive plants allowed the authors to reveal a huge diversity of trichomes and their stability not only at the species level but in some cases also within a different taxonomic rank (tribes, sections). Pubescence details can also be used for identifying species at early developmental stages or for recognizing seasonal forms within a species.
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Pubescence of vegetative organs and trichome micromorphology in some Boraginaceae at different ontogenetic stagesстатья Электронная публикация

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