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BIOLOGIC STRAINS OF OPHIOBOLUS GRAMINIS SACC.
Author(s) -
PADWICK G. W.
Publication year - 1936
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1936.tb05552.x
Subject(s) - biology , hordeum vulgare , desiccation , agropyron , botany , agar , potato dextrose agar , hordeum , nutrient agar , poaceae , bacteria , genetics
SUMMARY1 Isolates of Ophiobolus graminis compared were obtained in England, Canada and Australia from the following hosts: Triticum vulgare, Agropyron tenerum, A. repens and Hordeum murinum.2 The optimum for growth of all isolates studied on carrot dextrose agar was in the neighbourhood of 25 o C. They varied in their ability to grow at temperatures above and below the optimum. 3 Isolates vary in type of growth on carrot dextrose agar, the most noticeable difference being in the production of macrohyphae. 4 Saltation leading to the abundant production of black strands of macrohyphae by a culture producing very few was observed. 5 There are distinct differences in ability to survive desiccation over calcium chloride or 60 per cent, sulphuric acid. There seems to be some relation between the presence of macrohyphae and ability to withstand desiccation. 6 Isolates exhibit marked differences in general pathogenicity, but these differences are not specific towards certain hosts. Those causing greatest reduction in length of plants of Triticum spelta also caused greatest injury to T. dicoccum, T. monococcum, T. vulgare varieties and Hordeum vulgare. Conversely, hosts most resistant to one isolate were also those most resistant to the others.