T. W. Clouston
Articles written in Journal of Genetics
Volume 38 Issue 1-2 July 1939 pp 133-159
Volume 41 Issue 2-3 January 1941 pp 391-409
Part II of this series gives a classification, based on blackarm resistance, of over 160 varieties and strains of cotton. Complete immunity was not found in any New World types but exists in some of the Old World species. Several of the results disagreed with statements by St Vincent workers, some of the strains classed as “somewhat resistant”, “highly resistant” and “immune” by them being found at Shambat to be fully susceptible. It is suggested that St Vincent results were based on differences in primary infection (seed infection), rather than on true tissue resistance and that these differences were accentuated by the presence or absence of seed fuzz and by plant vigour.
Part III shows the type of blackarm resistance inheritance obtaining in the crosses Uganda B. 31 × 514 and B. 31 × 513 (all three are American Upland types) the latter results being further clarified by crosses between 513 and Sakel.
Uganda B. 31 contains resistance factors
It is shown that 513, a selection from a Punjab American Upland importation with grade “5”–“6” resistance, contains factor
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