Hydrolase treatments help unravel the function of intervessel pits in xylem hydraulics.

Abstract:

:Intervessel pits are structures that play a key role in the efficiency and safety functions of xylem hydraulics. However, little is known about the components of the pit membrane (PM) and their role in hydraulic functions, especially in resistance to cavitation. We tested the effect of commercial chemicals including a cellulase, a hemicellulase, a pectolyase, a proteinase and DTT on xylem hydraulic properties: vulnerability to cavitation (VC) and conductance. The effects were tested on branch segments from Fagus sylvatica (where the effects on pit structure were analyzed using TEM) and Populus tremula. Cellulose hydrolysis resulted in a sharp increase in VC and a significant increase in conductance, related to complete breakdown of the PM. Pectin hydrolysis also induced a sharp increase in VC but with no effect on conductance or pit structure observable by TEM. The other treatments with hemicellulase, proteinase or DTT showed no effect. This study brings evidence that cellulose and pectins are critical components underpinning VC, and that PM components may play distinct roles in the xylem hydraulic safety and efficiency.

journal_name

Physiol Plant

journal_title

Physiologia plantarum

authors

Dusotoit-Coucaud A,Brunel N,Tixier A,Cochard H,Herbette S

doi

10.1111/ppl.12092

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

388-96

issue

3

eissn

0031-9317

issn

1399-3054

journal_volume

150

pub_type

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