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Productivity vs drought adaptation in olive leaves: comparison of water relations in a modern versus a traditional cultivar
Year:
2021
Source of publication :
Physiologia Plantarum
Authors :
Dag, Arnon
;
.
Hochberg, Uri
;
.
Sorek, Yonatan
;
.
Volume :
Co-Authors:

Oded Barzilai 
Yonatan Sorek 
May Avraham 
Hanit Zemah 
 Arnon Dag
 Uri Hochberg                

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

The physiological traits that set the tradeoff between productivity and drought adaptation in plants are still under debate. To reveal these traits, we compared the water relations of two olive (Olea europaea) cultivars: 'Barnea'- a highly productive modern cultivar; and 'Souri'- a drought-adapted traditional cultivar. We hypothesized that Souri has lower hydraulic conductivity and lower hydraulic vulnerability. The hypothesis was tested at the leaf level. The soil volumetric water content (θ), stem water potential (ΨS ) and gas exchange were measured in both cultivars while they dried until a significant reduction in their maximal photochemical potential (Fv /Fm < 0.6) was obtained. Additionally, pressure-volume relations, leaf hydraulic vulnerability and the petiole xylem architecture were evaluated. To our surprise, Souri's leaf hydraulic conductivity was more vulnerable to low ΨS , approaching zero at -8 MPa compared with <-10 MPa in 'Barnea'. At the same time, Souri's higher osmotic content and cell rigidity enabled it to sustain 1.4 MPa lower ΨS , while maintaining near optimal (Fv /Fm ). However, both cultivars significantly reduced their Fv /Fm (< 0.6) at the same θ, suggesting that the capability to sustain a low θ is not the issue. Instead, Souri's lower transpiration enabled it to withstand a longer drought while avoiding low θ. Barnea's larger xylem vessels and hydraulic conductivity supported higher stomatal conductance (gs ) and assimilation rate, which nurtured its higher productivity but resulted in quick depletion of θ. These results suggest that hydraulic resistance or the ability to sustain low θ do not set the tradeoff between productivity and drought adaptation in olive leaves.

Note:
Related Files :
drought adaptation
Olive cultivar
water
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More details
DOI :
10.1111/ppl.13580
Article number:
0
Affiliations:
Database:
PubMed
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
56583
Last updated date:
02/03/2022 17:27
Creation date:
13/10/2021 17:31
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Scientific Publication
Productivity vs drought adaptation in olive leaves: comparison of water relations in a modern versus a traditional cultivar

Oded Barzilai 
Yonatan Sorek 
May Avraham 
Hanit Zemah 
 Arnon Dag
 Uri Hochberg                

The physiological traits that set the tradeoff between productivity and drought adaptation in plants are still under debate. To reveal these traits, we compared the water relations of two olive (Olea europaea) cultivars: 'Barnea'- a highly productive modern cultivar; and 'Souri'- a drought-adapted traditional cultivar. We hypothesized that Souri has lower hydraulic conductivity and lower hydraulic vulnerability. The hypothesis was tested at the leaf level. The soil volumetric water content (θ), stem water potential (ΨS ) and gas exchange were measured in both cultivars while they dried until a significant reduction in their maximal photochemical potential (Fv /Fm < 0.6) was obtained. Additionally, pressure-volume relations, leaf hydraulic vulnerability and the petiole xylem architecture were evaluated. To our surprise, Souri's leaf hydraulic conductivity was more vulnerable to low ΨS , approaching zero at -8 MPa compared with <-10 MPa in 'Barnea'. At the same time, Souri's higher osmotic content and cell rigidity enabled it to sustain 1.4 MPa lower ΨS , while maintaining near optimal (Fv /Fm ). However, both cultivars significantly reduced their Fv /Fm (< 0.6) at the same θ, suggesting that the capability to sustain a low θ is not the issue. Instead, Souri's lower transpiration enabled it to withstand a longer drought while avoiding low θ. Barnea's larger xylem vessels and hydraulic conductivity supported higher stomatal conductance (gs ) and assimilation rate, which nurtured its higher productivity but resulted in quick depletion of θ. These results suggest that hydraulic resistance or the ability to sustain low θ do not set the tradeoff between productivity and drought adaptation in olive leaves.

Scientific Publication
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