A comparison of cultural characteristics and infectivity of Frankia isolates from root nodules of Casuarina species

摘要: The isolations of three new strains Frankia were made from root nodules Casuarina cunninghamiana growing aeroponically. Two strains, HFPCcI1 and HFPCcI2 isolated by Lopez are typical producing sporangia among filamentous mats in culture and, the absence combined nitrogen, forming vesicles showing acetylene reduction. They red-pigmented although failing to nodulate hosts, effectively nodulated Elaeagnus Hippophae. A third strain HFPCcI3 Zhang same source, also a Frankia, can form reduce acetylene, is unpigmented, fails but nodulates C. equisetifolia. Comparisons all isolates our collection around world (twelve all) with regard their cultural characteristics capacity infect host plant species. Questions raised about specificity various possible affinities. Opportunities suggested for inoculation seedlings forestry field application using infective, effective now available.