ISSN:
1573-5036
Keywords:
Barley
;
Hordeum vulgare
;
K influx
;
Mechanical stress
;
Nutrient uptake
;
Pressure
;
Root growth
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Roots of barley (Hordeum vulgare, L. v. Salve) exposed to a mechanical stress (pressure) showed morphological and growth changes and differences in nutrient uptake. A model system was used where the roots developed in a nutrient solution in a bed of glass beads, which was compressed by an external pressure of 20 kPa. Pot experiments with compacted sand gave similar results. The main effects of applied pressure were: 1) elongation of roots was suppressed to 30–40% of controls, 2) mean diameter of roots increased, 3) dry matter content of roots increased, 4) N concentration of whole plants decreased, 5) Ca concentration of roots decreased, 6) concentrations of P, K and S were mainly unaffected. The results indicated that the main part of N and P are absorbed by lateral roots but that Ca is taken up by seminal roots. Short term experiments showed that K (86Rb) influx in roots of stressed plants was reduced to 50% of the controls. The corresponding inhibition for SO4 (35S) influx was 20%.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02184300
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