Control of wheat root growth. The effects of excision on growth, wall rheology and root anatomy

Excision and subsequent incubation of the apices (1 cm) of wheat (Triticum aestivum L.) seedling roots in simple media severely reduced elongation from 28 mm·(24 h)-1 in intact roots to a maximum of 2 mm·(24 h)-1 in excised roots. The reduction in growth was accompanied by a loss of cell turgor in t...

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Bibliographic Details
Published in:Planta 1988-12, Vol.176 (3), p.399-405
Main Authors: Pritchard, J. (University Coll. of North Wales, Bangor, Gwynedd (UK). Dept. of Biochemistry and Soil Science), Wyn Jones, R.G, Tomos, A.D
Format: Article
Language:English
Subjects:
Biological and medical sciences
Cell growth
CELL WALLS
CHEMICOPHYSICAL PROPERTIES
CORTA DE LAS RAICES
CRECIMIENTO
CROISSANCE
Elastizitaet
Fundamental and applied biological sciences. Psychology
GROWTH
in vitro
PARED CELULAR
PAROI CELLULAIRE
Physical agents
Plant physiology and development
Plant roots
Plants
PROPIEDADES FISICO-QUIMICAS
PROPRIETE PHYSICO-CHIMIQUE
RACINE
RAFRAICHISSEMENT DES RACINES
RAICES
Rheology
Root cap
Root growth
ROOT PRUNING
Root tips
ROOTS
Tensiometers
Triticum
TRITICUM AESTIVUM
TURGENCIA
TURGESCENCE
TURGOR
Turgor pressure
Vegetative apparatus, growth and morphogenesis. Senescence
Wachstum
Wurzelapex
Zellgroesse
Zellwand
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Summary:Excision and subsequent incubation of the apices (1 cm) of wheat (Triticum aestivum L.) seedling roots in simple media severely reduced elongation from 28 mm·(24 h)-1 in intact roots to a maximum of 2 mm·(24 h)-1 in excised roots. The reduction in growth was accompanied by a loss of cell turgor in the growing zone but was correlated with a hardening of the cell walls in this region. Rheological properties were measured as percent extensibility (both plastic and elastic) using a tensiometer, and as instantaneous volumetric elastic modulus (εi) using the pressure probe. Excision decreased plastic and elastic properties with a half-time of some 60 min. Plastic extension was reduced from 2.5% to 0.9% and elastic from 4.8% to 2.6% for an 8-g load. By contrast, εi was increased by excision. The observed reduction in root elongation rate was accompanied by a reduction in mature cell length from 240 μm to 40 μm and a shortening of the zone of cell expansion.
ISSN:0032-0935
1432-2048
DOI:10.1007/BF00395421