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Studies in the inheritance of Disease-Resistance

Published online by Cambridge University Press:  27 March 2009

R. H. Biffen
R. H. Biffen
Affiliation:
Agricultural Department, Cambridge University
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Extract

On crossing immune and susceptible varieties the resulting offspring is susceptible.

On self-fertilization these susceptible individuals produce immune and susceptible descendants in the proportion of one of the former to three of the latter. The degree of susceptibility is variable.

Where the degree of susceptibility differs in the two parents the hybrid resembles the more susceptible parent in that respect. Among the descendants of such hybrids the two degrees of susceptibility appear in the usual Mendelian ratio of one slightly to three very susceptible individuals.

The relatively immune forms breed true to this characteristic in the succeeding generations.

Immunity is independent of any discernible morphological character, and it is practicable to breed varieties morphologically similar to one another, but immune or susceptible to the attacks of certain parasitic fungi.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 2 , Issue 2 , April 1907 , pp. 109 - 128
Copyright
Copyright © Cambridge University Press 1907

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References

page 109 note 1 Biffen, , Journ. Agric. Sci. Vol. I. p. 40.Google Scholar

page 110 note 1 For a complete account and figures, reference may be made to Eriksson, Die Getreideroste, p. 141.

page 111 note 1 Eriksson, ibid. pp. 333 and 342.

page 113 note 1 Since writing the above, reports from the Transvaal and from Canada, where small sowings of this variety have been made, show that it is very susceptible to the black rust. It is possible that this is the wheat known as Kidd in Canada, which is similar morphologically and known to be susceptible to this rust.

page 114 note 1 De Bary, Gomp. Morph. and Biology of the Fungi, p. 361. Gibson, , New Phytologist, Vol. XIX. p. 184.Google Scholar

page 114 note 2 Salmon, , Anns. Bot. Vol. XIX. p. 125.Google Scholar

page 115 note 1 Eriksson, , Ann. d. Sc. Nat. T. XIV. p. 107, 1901.Google Scholar

page 120 note 1 It is a well known fact that fungi can readily attack withering or even resting plant tissues which in a normal or an active state are immune. Hartig for example has shown that the mycelium of Peziza Wilkomii can only work its way through the tissues of the larch when in a resting condition.

page 120 note 2 Spillman, , see Journ. Hort. Soc. Vol XXVII. p. 876.Google Scholar

page 121 note 1 Biffen, , Journ. Agric. Sci. Vol. I. p. 43.Google Scholar

page 121 note 2 The statistics for this series were obtained by Mr S. V. Shevade of the Pusa Research Station, India.

page 122 note 1 S. V. S.

page 126 note 1 Zeits. für Pflanzenkrankheiten, 1893, p. 185.

page 126 note 2 M'Alpine, , Victorian Naturalist, Vol. XXIII. p. 45.Google Scholar

page 127 note 1 Knight, , The Pamphleteer, Vol. VI. p. 402, 1815.Google Scholar

page 127 note 2 Farrer, , Agric. Gaz. of New South Wales, Vol. IX. p. 131, 1889.Google Scholar