Antagonistic phenomena between rhizoplane, rhizosphere and non-rhizospheric soil fungi of Pinus halepensis and Rosamarinus officinalis were studied by means of dual culture trials in order to ascertain if such interactions could explain the saprotrophic colonization of the root surfaces of the two plants. Penicillium restrictum, a species dominant in the rhizosphere and the in non-rhizospheric soil around both plants, but usually not isolated from the rhizoplsane, was strongly inhibited by five out of the nine root-surface fungi against which it was tested. P. restrictum, therefore, should not be sufficiently capable of outcompeting most rhizoplane fungi. Similarly, the inhibition of Mortierella alpine (isolated only from non-rhizospheric soil of both plants, but reported as a rhizoplane fungus by other authors) by Fusarium sp. 1, occurring with high frequency on the root surface of both plants, could contribute to the suppression of Mortierella from the rhizoplane. Fusarium sp. 1 proved to be able to inhibit both Cylindrocarpon destructans var. destructans and Fusarium oxysporum, the most frequently isolated species from P. halepensis and R. officinalis rhizoplanes, respectively; furthermore this species antagonized all other fungi to which it was opposed. It seems to have marked antagonistic abilities, what could contribute to its establishment on the rhizoplanes of both plants. Other factors instead have to be invoked to explain the presence of Mycelium sterile dematiaceum 1, colonizer of both plants too.
In vitro antagonistic interactions between saprotrophic microfungi associated with the roots of Pinus halepensis and Rosmarinus officinalis
GIRLANDA, Mariangela;
1995-01-01
Abstract
Antagonistic phenomena between rhizoplane, rhizosphere and non-rhizospheric soil fungi of Pinus halepensis and Rosamarinus officinalis were studied by means of dual culture trials in order to ascertain if such interactions could explain the saprotrophic colonization of the root surfaces of the two plants. Penicillium restrictum, a species dominant in the rhizosphere and the in non-rhizospheric soil around both plants, but usually not isolated from the rhizoplsane, was strongly inhibited by five out of the nine root-surface fungi against which it was tested. P. restrictum, therefore, should not be sufficiently capable of outcompeting most rhizoplane fungi. Similarly, the inhibition of Mortierella alpine (isolated only from non-rhizospheric soil of both plants, but reported as a rhizoplane fungus by other authors) by Fusarium sp. 1, occurring with high frequency on the root surface of both plants, could contribute to the suppression of Mortierella from the rhizoplane. Fusarium sp. 1 proved to be able to inhibit both Cylindrocarpon destructans var. destructans and Fusarium oxysporum, the most frequently isolated species from P. halepensis and R. officinalis rhizoplanes, respectively; furthermore this species antagonized all other fungi to which it was opposed. It seems to have marked antagonistic abilities, what could contribute to its establishment on the rhizoplanes of both plants. Other factors instead have to be invoked to explain the presence of Mycelium sterile dematiaceum 1, colonizer of both plants too.
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