PMID- 24420931
OWN - NLM
STAT- MEDLINE
DCOM- 20141203
LR  - 20240322
IS  - 1532-2548 (Electronic)
IS  - 0032-0889 (Print)
IS  - 0032-0889 (Linking)
VI  - 164
IP  - 4
DP  - 2014 Apr
TI  - A hydraulic model is compatible with rapid changes in leaf elongation under 
      fluctuating evaporative demand and soil water status.
PG  - 1718-30
LID - 10.1104/pp.113.228379 [doi]
AB  - Plants are constantly facing rapid changes in evaporative demand and soil water 
      content, which affect their water status and growth. In apparent contradiction to 
      a hydraulic hypothesis, leaf elongation rate (LER) declined in the morning and 
      recovered upon soil rehydration considerably quicker than transpiration rate and 
      leaf water potential (typical half-times of 30 min versus 1-2 h). The morning 
      decline of LER began at very low light and transpiration and closely followed the 
      stomatal opening of leaves receiving direct light, which represent a small 
      fraction of leaf area. A simulation model in maize (Zea mays) suggests that these 
      findings are still compatible with a hydraulic hypothesis. The small water flux 
      linked to stomatal aperture would be sufficient to decrease water potentials of 
      the xylem and growing tissues, thereby causing a rapid decline of simulated LER, 
      while the simulated water potential of mature tissues declines more slowly due to 
      a high hydraulic capacitance. The model also captured growth patterns in the 
      evening or upon soil rehydration. Changes in plant hydraulic conductance partly 
      counteracted those of transpiration. Root hydraulic conductivity increased 
      continuously in the morning, consistent with the transcript abundance of Zea 
      maize Plasma Membrane Intrinsic Protein aquaporins. Transgenic lines 
      underproducing abscisic acid, with lower hydraulic conductivity and higher 
      stomatal conductance, had a LER declining more rapidly than wild-type plants. 
      Whole-genome transcriptome and phosphoproteome analyses suggested that the 
      hydraulic processes proposed here might be associated with other rapidly 
      occurring mechanisms. Overall, the mechanisms and model presented here may be an 
      essential component of drought tolerance in naturally fluctuating evaporative 
      demand and soil moisture.
FAU - Caldeira, Cecilio F
AU  - Caldeira CF
AD  - INRA, Unite Mixte de Recherche 759 Laboratoire d'Ecophysiologie des Plantes sous 
      Stress Environnementaux, F-34060 Montpellier, France.
FAU - Bosio, Mickael
AU  - Bosio M
FAU - Parent, Boris
AU  - Parent B
FAU - Jeanguenin, Linda
AU  - Jeanguenin L
FAU - Chaumont, Francois
AU  - Chaumont F
FAU - Tardieu, Francois
AU  - Tardieu F
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20140113
PL  - United States
TA  - Plant Physiol
JT  - Plant physiology
JID - 0401224
RN  - 0 (Aquaporins)
RN  - 0 (Plant Proteins)
RN  - 0 (Protons)
RN  - 0 (RNA, Messenger)
RN  - 0 (Soil)
RN  - 059QF0KO0R (Water)
SB  - IM
MH  - Aquaporins/metabolism
MH  - Circadian Rhythm/physiology
MH  - Computer Simulation
MH  - Gene Expression Profiling
MH  - Gene Expression Regulation, Plant/radiation effects
MH  - Hydroponics
MH  - Light
MH  - *Models, Biological
MH  - Phenotype
MH  - Photosynthesis/radiation effects
MH  - Plant Leaves/*growth & development/radiation effects
MH  - Plant Proteins/metabolism
MH  - Plant Roots/genetics/physiology
MH  - Plant Transpiration/*physiology/radiation effects
MH  - Plants, Genetically Modified
MH  - Protons
MH  - RNA, Messenger/genetics/metabolism
MH  - *Soil
MH  - Time Factors
MH  - Water/*metabolism
MH  - Xylem/metabolism
MH  - Zea mays/genetics/growth & development/*physiology/radiation effects
PMC - PMC3982736
EDAT- 2014/01/15 06:00
MHDA- 2014/12/15 06:00
PMCR- 2014/01/13
CRDT- 2014/01/15 06:00
PHST- 2014/01/15 06:00 [entrez]
PHST- 2014/01/15 06:00 [pubmed]
PHST- 2014/12/15 06:00 [medline]
PHST- 2014/01/13 00:00 [pmc-release]
AID - pp.113.228379 [pii]
AID - 228379 [pii]
AID - 10.1104/pp.113.228379 [doi]
PST - ppublish
SO  - Plant Physiol. 2014 Apr;164(4):1718-30. doi: 10.1104/pp.113.228379. Epub 2014 Jan 
      13.