Indian Society of Genetics & Plant Breeding

Inheritance of resistance to spot blotch disease in wheat

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The mode of inheritance to spot blotch or
Helminthosporium leaf blight (HLB) resistance was studied
in segregating populations of 15 crosses involving two
resistant wheat lines; a Thinopyrum derived CIMMYT wheat
line, CIGM 84-295-1, and a Chinese line, Ning 8201. The
disease reaction of F1 and F2 progeny of crosses involving
the resistant wheat line, CIGM 84-295-1 and four
susceptible lines indicated monogenic recessive
resistance to HLB, whereas crosses involving Ning 8201
with the same susceptible parents showed resistance was
controlled by a dominant gene. The segregation ratio of
F2 progeny derived from the cross, Ning 8201 x CIGM 84-
295-1 (resistant x resistant) followed a ratio of 13 resistant:
3 susceptible as expected for genetically two independent
dominant and recessive genes. The F3 progeny testing of
the F2 susceptible plants confirmed the presence of
dominant and recessive gene interaction. The progeny
obtained from the crosses between the susceptible
parents were all susceptible to HLB disease.

Keywords: Disease resistance; Helminthosporium leaf blight; inheritance; supplementary gene interaction; Triticum aestivum


Year: 2009
Volume: 69
Issue: 3
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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