Increasing axial parenchyma fraction in the Malagasy Magnoliids facilitated the co-optimisation of hydraulic efficiency and safety.

Autor: Aritsara ANA; Plant Ecophysiology and Evolution Group, State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, 530004, China.; Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning, 530004, China.; Unité de Formation et de Recherche Sciences du Bois, Département Foresterie et Environnement, Ecole Supérieure des Sciences Agronomiques, Université d'Antananarivo, BP 175, Antananarivo, 101, Madagascar., Razakandraibe VM; Unité de Formation et de Recherche Sciences du Bois, Département Foresterie et Environnement, Ecole Supérieure des Sciences Agronomiques, Université d'Antananarivo, BP 175, Antananarivo, 101, Madagascar., Ramananantoandro T; Unité de Formation et de Recherche Sciences du Bois, Département Foresterie et Environnement, Ecole Supérieure des Sciences Agronomiques, Université d'Antananarivo, BP 175, Antananarivo, 101, Madagascar., Gleason SM; Water Management and Systems Research Unit, USDA-ARS, Fort Collins, CO, 80526, USA., Cao KF; Plant Ecophysiology and Evolution Group, State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, 530004, China.; Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning, 530004, China.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2021 Feb; Vol. 229 (3), pp. 1467-1480. Date of Electronic Publication: 2020 Oct 27.
DOI: 10.1111/nph.16969
Abstrakt: The evolution of angiosperms was accompanied by the segregation and specialisation of their xylem tissues. This study aimed to determine whether the fraction and arrangement of parenchyma tissue influence the hydraulic efficiency-safety trade-off in the basal angiosperms. We examined xylem anatomical structure and hydraulic functioning of 28 woody species of Magnoliids in a tropical rainforest of Madagascar and reported, for the first time, quantitative measurements that support the relationship between vessel-to-xylem parenchyma connectivity and the hydraulic efficiency-safety trade-off. We also introduced a new measurement - the distance of species from the trade-off limit - to quantify the co-optimisation of hydraulic efficiency and safety. Although the basal angiosperms in this study had low hydraulic conductivity and safety, species with higher axial parenchyma fraction (APf) had significantly higher hydraulic conductivity. Hydraulic efficiency-safety optimisation was accompanied by higher APf and vessel-to-axial parenchyma connectivity. Conversely, species exhibiting high ray parenchyma fraction and high vessel-to-ray connectivity had lower K s and were further away from the hydraulic trade-off limit line. Our results provide evidence that axial parenchyma fraction and paratracheal arrangement are associated with both enhanced hydraulic efficiency and safety.
(© 2020 The Authors New Phytologist © 2020 New Phytologist Foundation.)
Databáze: MEDLINE
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