Method for selecting disease resistant mutant plants

Multicellular living organisms and unmodified parts thereof and – Method of using a plant or plant part in a breeding process... – Breeding for pathogen or pest resistance or tolerance

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800260, 800278, 800279, 800301, 4351721, 536 241, A01H 104, C12N 1509, C12N 1529

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060574909

ABSTRACT:
Methods are provided for selecting parental plants exhibiting disease resistance and for using these plants in breeding programs. In one method of the invention, constitutive immunity (cim) mutants are screened for either resistance to a pathogen of interest or for the expression of systemic acquired resistance (SAR) genes. Such mutants having the desired traits or expressing the desired genes are then used in breeding programs. Parent plants can also be selected based on the constitutive expression of SAR genes. These mutants are phenotypically normal yet exhibit a significant level of disease resistance. Also disclosed are lesion-simulating-disease (lsd) mutants having a lesion mimic phenotype that also express SAR genes and exhibit disease resistance. Further disclosed are non-inducible immunity (nim) mutants that do not express SAR genes, even when induced by a pathogen. Methods of use for these mutants are also disclosed.

REFERENCES:
patent: 5614395 (1997-03-01), Ryals et al.
patent: 5792904 (1998-08-01), Ryals et al.
patent: 5989846 (1999-11-01), Klessig et al.
Ryals et al. Systemic Acquired Resistance. The Plant Cell. vol. 8, pp. 1809-1819, 1996.

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