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A STUDY OF CROWN RUST, PUCCINI A CORONATA CORDA, IN GREAT BRITAIN: PHYSIOLOGIC SPECIALIZATION IN THE UREDOSPORE STAGE 1
Author(s) -
BROWN M. R.
Publication year - 1937
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.1744-7348.1937.tb05850.x
Subject(s) - biology , inoculation , botany , rust (programming language) , race (biology) , host (biology) , horticulture , ecology , computer science , programming language
S ummary1 Uredospore cultures of Puccinia coronata Corda were established in the greenhouse, on their appropriate hosts, by inoculation with uredoor aecidiospores collected in the field. Their pathogenicity was tested by inoculating the uredospores on to a series of grass genera and oat varieties. 2 Seven varieties of P. coronata have been distinguished in Great Britain:3 All these varieties have previously been identified on the continent of Europe and some have been identified in North America. 4 Some varieties are confined to a single host genus; others infect several genera. 5 Four physiologic races were distinguished in the var. avenae : race 6, previously identified in North America and Australia, and races 42, 43 and 44, hitherto undescribed. Races 6, 42 and 44 were obtained in Great Britain and race 43 in Portugal. 6 Experiments carried out under different conditions of temperature and illumination showed that variation in these conditions had only a slight influence upon the infection type produced. 7 Marked variation in reaction to the rust was shown by plants of the same species of grass inoculated with the same culture under identical conditions. This was probably due to genetic impurity of the grasses. 8 There were no clear‐cut differences, either in morphological or pathological characters, between the varieties assigned by Klebahn to P. coronata Kleb. and those assigned to P. coronifera Kleb. ( P. Lolii Niels.).