first steps towards an explicit modeling of ......2013/05/07 · first steps towards an explicit...

9th International Workshop on Sap Flow7th June 2013

Plant PhysiologyULg

FIRST STEPS TOWARDS AN EXPLICIT MODELING OF ABA PRODUCTION AND

TRANSLOCATION IN RELATION WITH THE WATER UPTAKE DYNAMICS

GUILLAUME LOBET, LOÏC PAGÈS AND XAVIER DRAYE

1

Plant PhysiologyULg

PLANET-ABA

2

PlaNet

Modeling results

Water Flow

Conclusions

WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM

PLANT

Plant PhysiologyULg

PLANET-ABA

2

PlaNet

Modeling results

Water Flow

Conclusions

SOIL

AIR


PLANT

Plant PhysiologyULg

PLANET-ABA

2

PlaNet

Modeling results

Water Flow

Conclusions

SOIL

AIR

ABA


PLANT

Plant PhysiologyULg

PLANET-ABA

2

PlaNet

Modeling results

Water Flow

Conclusions

SOIL

AIR

ABA

4D architecture

Heterogenous hydraulic

conductances

Root to shoot signaling


Plant PhysiologyULg

PLANET-ABA

PlaNet

Modeling results

Water Flow

Conclusions

4D architecture


conductances


MODELING WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM

PLANET-MAIZE

Lobet et al, 2012

Plant PhysiologyULg

PLANET-ABA

4

PlaNet

Modeling results

Water Flow

Conclusions

ψxyl ψsoil

ψsoil

Kx

Kx

Kr

Krψxyl

ψxyl ψsoil

Kx

Kr

ψxyl ψsoil

KxKr

ψxylψsoil

ψsoil

Kx

Kx

Kr

Krψxyl

ψxylψsoil

Kx

Kr

Variable hydraulic propertiesSystem of linear equations

4D architecture


conductances



Doussan et al. 2006

Plant PhysiologyULg

PLANET-ABA

5

PlaNet

Modeling results

Water Flow

Conclusions

4D architecture


conductances



ABA translocation

Stomatal closure = f(ψ, ABA)

ABA production = f(ψ)ABA degradation = f(t)


Tardieu et Davies 1993Dodd et al. 2008, 2010

Plant PhysiologyULg

PLANET-ABA

5

PlaNet

Modeling results

Water Flow

Conclusions

4D architecture


conductances



ABA translocation

Stomatal closure = f(ψ, ABA)



Tardieu et Davies 1993Dodd et al. 2008, 2010

LEAF

ROOT

Plant PhysiologyULg

PLANET-ABA

6

PlaNet

Modeling results

Water Flow

Conclusions

SIMULATION PARAMETERS

-1,5

-1,1

-0,8

-0,4

0

100 150 200 250 300so

il wat

er p

oten

tial (

MPa

)time (h)

Homogenous soil water content

decrease

Three conditions

2. No ABA production in the

roots

3. No ABA production in the

shoot

1. Normal conditions

Plant PhysiologyULg

PLANET-ABA

7

PlaNet

Modeling results

Water Flow

Conclusions

NORMAL SCENARIO

100 150 200 250 300

-1.2

-0.8

-0.4

Roots

time (h)

wat

er p

oten

tial (

MP

a)No dryingHomogenous drying

100 150 200 250 300

-1.2

-0.8

-0.4

Leaves

time (h)100 150 200 250 300

-1.2

-0.8

-0.4

Soil

time (h)

A B C

Plant water potential decrease with soil drying

Plant PhysiologyULg

PLANET-ABA

7

PlaNet

Modeling results

Water Flow

Conclusions

NORMAL SCENARIO

100 150 200 250 300

-1.2

-0.8

-0.4

Roots

time (h)

wat

er p

oten

tial (

MP


100 150 200 250 300

-1.2

-0.8

-0.4

Leaves

time (h)100 150 200 250 300

-1.2

-0.8

-0.4

Soil

time (h)

A B C

100 150 200 250 300

0.2

1.0

5.0

20.0

100.0 Roots

time (h)

[AB

A] n

M

No dryingHomogenous drying

100 150 200 250 300

520

50200

1000

Leaves

time (h)

[AB

A] n

M

100 150 200 250 300

520

50200

1000

Collar

time (h)

[AB

A] n

M

A B CRoots Leaves Collar


ABA is produced as plant article water potential decreases

Plant PhysiologyULg

PLANET-ABA

7

PlaNet

Modeling results

Water Flow

Conclusions

NORMAL SCENARIO

100 150 200 250 300

-1.2

-0.8

-0.4

Roots

time (h)

wat

er p

oten

tial (

MP


100 150 200 250 300

-1.2

-0.8

-0.4

Leaves

time (h)100 150 200 250 300

-1.2

-0.8

-0.4

Soil

time (h)

A B C

100 150 200 250 300

0.2

1.0

5.0

20.0

100.0 Roots

time (h)

[AB

A] n

M


100 150 200 250 300

520

50200

1000

Leaves

time (h)

[AB

A] n

M

100 150 200 250 300

520

50200

1000

Collar

time (h)

[AB

A] n

M

A B CRoots Leaves Collar

100 150 200 250 300

1e-10

2e-10

5e-10

1e-09

2e-09

temps (h)

radi

al c

ond.

(m−1

sMPa)


100 150 200 250 300-2.0e-09

-1.5e-09

-1.0e-09

-5.0e-10

0.0e+00

temps (h)

radi

al fl

ux (kg H

20/s)

100 150 200 250 300

050

100

150

200

250

300

temps (h)

cum

ulat

ive

trans

pira

tion

(gH

20)

A B

time(h) time(h)


ABA is produced as plant article water potential decreases

Stomata closes with soil drying

Plant PhysiologyULg

PLANET-ABA

8

PlaNet

Modeling results

Water Flow

Conclusions

REMOVING ABA PRODUCTION

Plant PhysiologyULg

PLANET-ABA

8

PlaNet

Modeling results

Water Flow

Conclusions


No ABA in the leaves Removes stomatal response

Plant PhysiologyULg

PLANET-ABA

8

PlaNet

Modeling results

Water Flow

Conclusions


No ABA in the leaves Removes stomatal response

No ABA in the root No effect on stomatal response

Plant PhysiologyULg

PLANET-ABA

9

PlaNet

Modeling results

Water Flow

Conclusions

DISCUSSIONS

In its current version the model does not support the role of ABA as a long distance signal

Plant PhysiologyULg

PLANET-ABA

9

PlaNet

Modeling results

Water Flow

Conclusions

DISCUSSIONS


In contraction with previous studies (Parent et al. 2009; Tardieu & Davies 1993; Tardieu & Simonneau 1998; Tardieu & Davies 1992)

Plant PhysiologyULg

PLANET-ABA

9

PlaNet

Modeling results

Water Flow

Conclusions

DISCUSSIONS



Not enough quantitative data at the local scale

Plant PhysiologyULg

PLANET-ABA

9

PlaNet

Modeling results

Water Flow

Conclusions

DISCUSSIONS



Not enough quantitative data at the local scale

ABA dynamic more complex (ABA-GE, ...)

Plant PhysiologyULg

PLANET-ABA

10

PlaNet

Modeling results

Water Flow

Conclusions

CONCLUSIONS

First step toward explicit modeling of ABA flux and effect on water flow at the plant level

Model is not able to reproduce the reality

ACKNOWLEDGMENTS

Sensitivity analysis on production and degradation rates

first steps towards an explicit modeling of ......2013/05/07 · first steps towards an explicit...

Documents