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More than just a vulnerable pipeline: xylem physiology in the light of ion-mediated regulation of plant water transport

Major restrictions to the hydraulic conductance of xylem (KXYL) in vascular plants have traditionally been attributed to anatomical constraints. More recently, changes in the cationic concentration of xylem sap have been suggested to be responsible for short-term changes in KXYL based on data for 35 dicot species, and very few gymnosperms and ferns, indicating that xylem water...

Water stress-induced modifications of leaf hydraulic architecture in sunflower: co-ordination with gas exchange

Andrea Nardini 0 Sebastiano Salleo 0 0 Dipartimento di Biologia, Universita` di Trieste , Via L. Giorgieri 10, 34127 Trieste , Italia The hydraulic architecture, water relationships, and gas

Effects of the experimental blockage of the major veins on hydraulics and gas exchange of Prunus laurocerasus L. leaves

The impact of leaf vein blockage on leaf hydraulic conductance (KL), gas exchange (gL) and water potential (ΨL) was studied in Prunus laurocerasus L., a broad‐leaved evergreen. For this purpose, leaves were measured for the three variables above, either with an intact leaf blade (controls) or with the midrib cut a third of the way up (cut a), or with the midrib cut at three...

Ion-mediated enhancement of xylem hydraulic conductivity is not always suppressed by the presence of Ca2+ in the sap

The physiological significance of ion-mediated enhancement of xylem hydraulic conductivity (Kh) in planta has recently been questioned. The phenomenon has been suggested to be an artefact caused by the use of deionized water as a reference fluid during measurements of the impact of different ions on Kh. In the present study, ion-mediated changes in Kh were measured in twigs of...

Seasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella

Sebastiano SALLEO 0 Andrea NARDINI 0 0 Dipartimento di Biologia, Università degli Studi di Trieste , via L. Giorgieri 10, 34127 Trieste , Italy - The leaf miner Cameraria ohridella causes premature

Seasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella

Sebastiano SALLEO 0 Andrea NARDINI 0 0 Dipartimento di Biologia, Università degli Studi di Trieste , via L. Giorgieri 10, 34127 Trieste , Italy - The leaf miner Cameraria ohridella causes premature

The dependence of leaf hydraulic conductance on irradiance during HPFM measurements: any role for stomatal response?

This paper examines the dependence of whole leaf hydraulic conductance to liquid water (KL) on irradiance when measured with a high pressure flowmeter (HPFM). During HPFM measurements, water is perfused into leaves faster than it evaporates hence water infiltrates leaf air spaces and must pass through stomates in the liquid state. Since stomates open and close under high versus...

Kinetics of recovery of leaf hydraulic conductance and vein functionality from cavitation‐induced embolism in sunflower

The kinetics of leaf vein recovery from cavitation‐induced embolism was studied in plants of sunflower cv. Margot, together with the impact of vein embolism on the overall leaf hydraulic conductance (Kleaf). During the air‐dehydration of leaves to leaf water potentials (ΨL) of –1.25 MPa, Kleaf was found to decrease by about 46% with respect to values recorded in well‐hydrated...