Indian Society of Genetics & Plant Breeding

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Genetics of rust resistance in soybean [Glycine max (L.) Merrill]

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Inheritance of rust resistance in soybean [Glycine max (L.)
Merrill] was studied in nine crosses involving 2 susceptible
and 5 resistant genotypes. The crosses were made in
three triangles keeping one parent common in all the 3
triangles. Seeds of all the generations viz., Pl , P2; Fl ,
F2 and F3 were divided into two sets, one of which was
used in field screening and other for controlled condition
study in greenhouse. Results obtained from both the
environments are similar. The F
2 segregation analysis
in all the six susceptible x resistant cross combinations
revealed that rust resistance is governed by a single
dominant gene. In Bragg x MACS 13, a cross of both
susceptible parents revealed that, there is no
complementation. In one of the 2 resistant x resistant
cross combinations TS 98-21 x EC 389160, there are two
different genes imparting resistance. Whereas in the
cross, PK 1029 x EC 389165, there was no segregation
for rust reaction in any of the generations which reveals
presence of the same gene for resistance in both the
parental lines. In all these crosses the F2 results were
confirmed by studying the F3 progenies.
 

Keywords: Soybean, rust, inheritance, rust resistance, genetics.

Info

Year: 2004
Volume: 64
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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