Drought rhizogenesis in Arabidopsis thaliana. Differential responses of hormonal mutants

Drought rhizogenesis is an adaptive strategy that occurs during progressive drought stress and is characterized in the Brassicaceae and related families by the formation of short, tuberized, hairless roots. These roots are capable of withstanding a prolonged drought period and give rise to a new fun...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1994-02, Vol.104 (2), p.761-767
Main Authors: Vartanian, N, Marcotte, L, Giraudat, J
Format: Article
Language:English
Subjects:
AGUA DEL SUELO
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
ARABIDOPSIS THALIANA
Auxins
Biological and medical sciences
CRECIMIENTO
CROISSANCE
Drought
EAU DU SOL
ECOTIPOS
ECOTYPE
Environmental and Stress Physiology
ETAPAS DE DESARROLLO DE LA PLANTA
Fundamental and applied biological sciences. Psychology
Humidity
MORFOGENESIS
MORPHOGENESE
MUTANT
MUTANTES
Plant physiology and development
Plant roots
Plants
RACINE
RAICES
Rhizogenesis
Root biomass
Root systems
SECHERESSE
SEQUIA
Soil water
STADE DE DEVELOPPEMENT VEGETAL
SUBSTANCE DE CROISSANCE VEGETALE
SUSTANCIAS DE CRECIMIENTO VEGETAL
Transpiration
VARIACION GENETICA
VARIATION GENETIQUE
Water and solutes. Absorption, translocation and permeability
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Summary:Drought rhizogenesis is an adaptive strategy that occurs during progressive drought stress and is characterized in the Brassicaceae and related families by the formation of short, tuberized, hairless roots. These roots are capable of withstanding a prolonged drought period and give rise to a new functional root system upon rehydration. The kinetics of drought rhizogenesis during progressive water shortage was analyzed in the Arabidopsis thaliana wild-type ecotypes Landsberg erecta and Columbia. in both genotypes, this response started from a similar threshold of soil humidity (about 2%). The intensity of drought rhizogenesis was compared in various A. thaliana hormonal mutants. The wild-type lines and most of the mutants achieved a similar drought rhizogenetic index (DRI), defined as the maximum number of short roots produced per mg of root biomass, after progressive drought stress. However, this DRI was dramatically reduced in the abscisic acid (ABA)-deficient aba, ABA-insensitive abi1-1, and auxin-resistant axr1-3 mutants. These data indicate that endogenous ABA and auxin play a promotive role in drought rhizogenesis. The DRI was highly increased in the gibberellin (GA) biosynthetic mutant ga5, suggesting that some Gas might also participate in this process. The possible role and identity of the GA species involved is discussed in view of the unaltered DRI values of the ga2, ga3, and ga4 mutants. The present analysis also allowed further discrimination among the various ABA-insensitive (abi1 versus abi2 and abi3) and auxin-resistant ( axr1 versus aux1) mutants tested. in particular, drought rhizogenesis is the first physiological response shown to be differentially affected by the abi1-1 and abi2-1 mutations
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.104.2.761