Biotically and abiotically caused damages of root systems in their importance for plant efficiency
1991
Brinkmann, R. (Hannover Univ. (Germany). Inst. fuer Pflanzenkrankheiten und Pflanzenschutz) | Schoenbeck, F.
Investigations on barley and lettuce were conducted to determine the effect of damage to root systems on plant efficiency. The effect on plant efficiency and the ability of plants to compensate for the damage (compensation capacity) were studied with regard to the source and degree of damage. In part, the individual damaging factors (Pythium ultimum, Cochliobolus sativus, copper and water deficiency) caused different root damage. More important, it appears that the plant efficiency was decreased differently in spite of equal damage and was dependent upon the cause of the damage. Yield reduction was also determined by the compensation capacity of the plants. Independent from the cause of damage, barley was able to compensate to a certain extent the effects of root damage by increasing the specific root efficiency, as measured by the volume of exudation per unit root and the content of potassium in the exudate. Lettuce was not able to this compensation. Root damage always decreased yield of both plant species despite the compensation capacity of barley
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