Limited plasticity in embolism resistance in response to light in leaves and stems in species with considerable vulnerability segmentation.

Autor: Avila RT; Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa, Brazil.; Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana, USA., Cardoso AA; Instituto de Ciências da Natureza, Universidade Federal de Alfenas, Alfenas, Brazil., Batz TA; Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana, USA., Kane CN; Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana, USA., DaMatta FM; Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa, Brazil., McAdam SAM; Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana, USA.
Jazyk: angličtina
Zdroj: Physiologia plantarum [Physiol Plant] 2021 Aug; Vol. 172 (4), pp. 2142-2152. Date of Electronic Publication: 2021 May 20.
DOI: 10.1111/ppl.13450
Abstrakt: Xylem resistance to embolism is a key metric determining plant survival during drought. Yet, we have a limited understanding of the degree of plasticity in vulnerability to embolism. Here, we tested whether light availability influences embolism resistance in leaves and stems. The optical vulnerability method was used to assess stem and leaf resistance to embolism in Phellodendron amurense and Ilex verticillata acclimated to sun and shade microenvironments within the same canopy. In both species, we found considerable segmentation in xylem resistance to embolism between leaves and stems, but only minor acclimation in response to light availability. With the addition of a third species, Betula pubescens, which shows no vulnerability segmentation, we sought to investigate xylem anatomical traits that might correlate with strong vulnerability segmentation. We found a correlation between the area fraction of vessels in the xylem and embolism resistance across species and tissue types. Our results suggest that minimal acclimation of embolism resistance occurs in response to light environment in the same individual and that the degree of vulnerability segmentation between leaves and stems might be determined by the vessel lumen fraction of the xylem.
(© 2021 Scandinavian Plant Physiology Society.)
Databáze: MEDLINE
Externí odkaz: