INFLUENCE OF SOIL QUALITY ON THE FUNCTION OF INHIBITORY RHIZOBACTERIA

Citation
Wr. Horwath et al., INFLUENCE OF SOIL QUALITY ON THE FUNCTION OF INHIBITORY RHIZOBACTERIA, Letters in applied microbiology, 26(2), 1998, pp. 87-92
Citations number
23
Categorie Soggetti
Microbiology,"Biothechnology & Applied Migrobiology
ISSN journal
02668254
Volume
26
Issue
2
Year of publication
1998
Pages
87 - 92
Database
ISI
SICI code
0266-8254(1998)26:2<87:IOSQOT>2.0.ZU;2-2
Abstract
The successful release of wild type and genetically modified micro-org anisms into soil has been impeded because efficacy is unpredictable. E vidence is presented showing that the plant-inoculum interaction can b e strongly influenced by cropping system management or soil type. Rhiz obacteria that inhibited the root growth of Poa annua and Lolium peren ne were isolated from soil. The isolates, an inhibitory isolate (W7(+) ) and a noninhibitory mutant (G2Y(-)), were identified as Pseudomonas putida. The rhizobacteria were used as soil inocula in a completely ra ndomized block design that included Poa and Lolium, four soils, and th ree inoculum carriers. Of the possible 15 interactions, 10 significant ly affected both the root and shoot growth. These results suggest that field trials conducted without consideration of soil quality factors and carrier delivery systems will be of dubious value when evaluating the performance of allochthonous micro-organisms in soil.