Botanica Pacifica. A journal of plant science and conservation Preprint
Article first published online: 30 AUG 2019 | DOI: 10.17581/bp.2019.08204
Wood anatomy of Brabejum and Macadamia (Macadamiinae, Proteaceae)
Anna V. Stepanova1,2 & Alexei A. Oskolski1,2
1 Department of Botany and Plant Biotechnology, University of Johannesburg, Johannesburg, South Africa
2 Komarov Botanical Institute RAS, Saint-Petersburg, Russia
Wood structure of Brabejum stellatifolium and Macadamia integrifolia (subtribe Macadamiinae, tribe Macadamieae, Proteaceae) is described for the first time. These species share exclusively simple perforation plates, minute to small alternate intervessel pits, non-septate libriform fibers, banded and unilaterally paratracheal axial parenchyma, and the rays of two distinct sizes, i.e. the suite of typical wood traits for many of Proteaceae. Our observations together with reported data suggest that the lineage comprising Brabejum, Macadamia and Panopsis is distinctive from closely related members of the tribe Macadamieae by the occurrence of vasicentric tracheids combined with the lack of fiber tracheids. More abundant axial parenchyma in Macadamia and Panopsis than in Brabejum is seemingly consistent with the global tendency to increase of amount of this tissue in the regions with warm climate. Libriform fibers is Macadamia integrifolia show one of the highest degrees of intrusiveness (F/V ratio = 3.98) reported within Proteaceae to date.
Степанова А.В., Оскольский А.А. Анатомия древесины Brabejum и Macadamia (Macadamiinae, Proteaceae) Впервые описано анатомическое строение древесины Brabejum stellatifolium и Macadamia integrifolia (подтриба Macadamiinae, триба Macadamieae, семейство Proteaceae). Для этих видов характерен набор признаков, типичных для многих протейных, таких как исключительно простые перфорационные пластинки, очень мелкие поры межсосудистой поровости, несептированные древесинные волокна, аксиальная паренхима односторонне-паратрахеальная и в тангентальных полосах, две отчетливых размерных группы лучей. Наши и литературные данные указывают на то, что монофилетическая группа, включающая роды Brabejum, Macadamia и Panopsis, отличается от других представителей Macadamieae наличием вазицентрических трахеид в сочетании с отсутствие волокнистых трахеид. Более обильная аксиальная паренхима у Macadamia и Panopsis по сравнению с Brabejum соответствует глобальной тенденции к увеличению количества этой ткани у растений в регионах с тёплым климатом. Древесинные волокна Macadamia integrifolia характеризуются одним из самых высоких уровней интрузивности (отношение средней длины волокон к средней длине члеников сосудов равно 3,98), известным для протейных.
Keywords: Brabejum, Macadamia, Proteaceae, wood anatomy, vasicentric tracheids, анатомия древесины, вазицентрические трахеиды
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