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PMID: 24420931 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

A hydraulic model is compatible with rapid changes in leaf elongation under fluctuating evaporative demand and soil water status.

Plant physiology ·Vol. 164 ·No. 4 ·2014-04-00 ·Pages 1718-30

Caldeira CF, Bosio M, Parent B, Jeanguenin L, Chaumont F, Tardieu F

Abstract

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.

MeSH Terms
Aquaporins/metabolism Circadian Rhythm/physiology Computer Simulation Gene Expression Profiling Gene Expression Regulation, Plant/radiation effects Hydroponics Light Models, Biological Phenotype Photosynthesis/radiation effects Plant Leaves/growth & development,radiation effects Plant Proteins/metabolism Plant Roots/genetics,physiology Plant Transpiration/physiology,radiation effects Plants, Genetically Modified Protons RNA, Messenger/genetics,metabolism Soil Time Factors Water/metabolism Xylem/metabolism Zea mays/genetics,growth & development,physiology,radiation effects
Chemicals
Aquaporins Plant Proteins Protons RNA, Messenger Soil Water
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Caldeira Cecilio F
INRA, Unité Mixte de Recherche 759 Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, F-34060 Montpellier, France.
Bosio Mickael
Parent Boris
Jeanguenin Linda
Chaumont François
Tardieu François
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
1532-2548
DOI
10.1104/pp.113.228379
Published
2014-04-00
Epub
2014-00-13
Pages
1718-30
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC3982736
Subset
IM
External Links
PubMed source DOI: 10.1104/pp.113.228379 PMC Full Text View journal details
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