Scaling of phloem hydraulic resistance in stems and leaves of the understory angiosperm shrub Illicium parviflorum

American Journal of Botany
Juan M Losada, N Michele Holbrook

Abstract

Recent studies in canopy-dominant trees revealed axial scaling of phloem structure. However, whether this pattern is found in woody plants of the understory, the environment of most angiosperms from the ANA grade (Amborellales-Nymphaeales-Austrobaileyales), is unknown. We used seedlings and adult plants of the understory tropical shrub Illicium parviflorum, a member of the lineage Austrobaileyales, to explore the anatomy and physiology of the phloem in their aerial parts, including changes through ontogeny. Adult plants maintain a similar proportion of phloem tissue across stem diameters, but larger conduit dimensions and number cause the hydraulic resistance of the phloem to decrease toward the base of the plant. Small sieve plate pores resulted in an overall higher sieve tube hydraulic resistance than has been reported in other woody angiosperms. Sieve elements increase in size from minor to major leaf veins, but were shorter and narrower in petioles. The low carbon assimilation rates of seedlings and mature plants contrasted with a 3-fold higher phloem sap velocity in seedlings, suggesting that phloem transport velocity is modulated through ontogeny. The overall architecture of the phloem tissue in this understory angiosperm...Continue Reading

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Citations

May 30, 2020·American Journal of Botany·Laura E ClerxN Michele Holbrook
Jul 2, 2021·Horticulture Research·Miguel Barceló-AnguianoJuan M Losada
Aug 18, 2021·The Plant Journal : for Cell and Molecular Biology·Miguel Barceló-AnguianoJuan M Losada

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