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Vergleichende mineralstoff-analysen an einigen loranthaceen und deren wirtspflanzen

1974; Elsevier BV; Volume: 73; Issue: 5 Linguagem: Inglês

10.1016/s0044-328x(74)80117-0

0044-328X

O. Horak,

Legume Nitrogen Fixing Symbiosis

Contents of Na, K, Ca, and Mg were determined in some species of Lorantbaceae and compared with those of the corresponding hosts. Total contents of mineral ions were extracted from dry plant matter with hydrochloric acid, soluble fractions were extracted with hot water. Mistletoes take up high amounts of mineral ions. Moreover they seem to prefer potassium. Ratios of K:Ca in Loranthus europaeus and Viscum laxum leaves were higher than in leaves of the corresponding host trees. In Viscum album and its hosts K:Ca ratios were nearly equal. All of the three studied species of Lorantbaceae showed much higher K:Mg ratios than their hosts. Some mistletoes take up relatively more potassium and less calcium and magnesium. This seems to be unusual for a xylem parasite since potassium is transported also in the host phloem. In these circumstances the possibility of an active transport of potassium from host tissue to mistletoe could be taken into consideration. Further a difference in Ca metabolism between Lorantbus and Viscum could be detected. Loranthus contains Ca mainly in soluble form in its cell sap, while Viscum precipitates nearly all of its Ca as insoluble oxalate.