Zur Mineralstoff-Konkurrenz zwischen Linum und Camelina I. Aufnahme von 35S-Sulfat

Abstract

Summary Both in monoculture and mixed culture, the uptake of 35 S sulphate into 20-day-old plants of Linum usitatissimum L. und Camelina sativa (L.) CRANTZ as well as 35 S transport from the root into the shoot of these plants were examined. In equal periods the Camelina plants took up essentially more sulphate of the nutrient solution than the Linum plants did. From among the two species, when standing in mixed culture, the Linum plants took up less sulphate ions than those in monoculture, whilst Camelina plants in mixed culture absorbed more sulphate ions than they did in monoculture. The differences of absorbed sulphate between monocultures and mixed cultures can be interpreted as the result of an inter-species competition for these ions. These findings support the opinion that the diminution of the dry weight of Linum under the influence of Camelina is caused decisively by competition and not by allelopathic factors. A participation of such factors, however, cannot be excluded. A diminished absorption of sulphate also took place in Linum plants having grown in a nutrient solution, in which Camelina plants already had been cultivated, but which mineral substances a new had been given to. The transportation of 35 S off the roots into shoot occurred in either species under mixed culture conditions to a higher extent than in the respective monocultures.