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THE RELATION BETWEEN HOST AND ENDOPHYTE IN ORCHID MYCORRHIZA
Author(s) -
HARVAIS G.,
HADLEY G.
Publication year - 1967
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1967.tb05999.x
Subject(s) - biology , endophyte , rhizoctonia , rhizoctonia solani , botany , host (biology) , symbiosis , mycorrhiza , ecology , bacteria , genetics
S ummary Extensive isolation of root endophytes from Orchis (Daciylorchis) purpurella and other British orchids yielded a variety of strains of Rhizoctonia and of other fungi. R. repens , a common orchid endophyte, occurred in several host species and habitats. R. solani was uncommon, being obtained only from Orchis purpurella and Coeloglossum viride in certain situations. Most Rhizoctonia strains were obtained from only one plant and one habitat and the evidence indicated that there was no specificity between host and endophyte. In symbiosis tests isolates from roots generally infected the protocorms but did not always stimulate the growth of the species from which they originated. Four strains of R. solani isolated from soil were stimulatory to Orchis purpurella protocorms. Of four Rhizoctonia solani strains pathogenic on crop hosts, two stimulated protocorm growth and one was parasitic. It is suggested that the occurrence of a strain as a root endophyte may largely be a reflection of its distribution and of the factors affecting its growth in the soil.