Zur Mineralstoff-Konkurrenz zwischen Linum und Camelina II. Aufnahme von 32P-Phosphat und 86Rubidium

Abstract

The uptake of 32 P-phosphate and 86 rubidium through the roots into 20-day-old plants of flax ( Linurn usitatissimum L.) and Camelina sativa (L.) C rantz was examined, both in monoculture and mixed culture. After periods of one hour the Camelina plants had already taken up essentially more phosphate and rubidium ions than the Linum plants. In mixed cultures of the two species, the Linum plants absorbed less, the Camelina plants more phosphate and rubidium ions than in the respective monocultures. These differences may be explained as the consequence of a competition of the species taking up ions to a varied extent. As under the conditions of competition for sulphate ions (KRANZ and JACOB 1977), the Camelina plants, in spite of considerably minor root volume, proved to be the superior partner with regard to the integration of mineral substances. We can assume, therefore, that the smaller harvest of the flax when associated with Camelina is caused to a decisive extent by competition and not by allelopathic phenomena.