Title page for ETD etd-32298-102824

Type of Document Master's Thesis
Author Bagade, Prashant Jr.
Author's Email Address gbuss@vt.edu
URN etd-32298-102824
Title Genetics of Resistance to Peanut Mottle Virus in Soybean
Degree Master of Science
Department Crop and Soil Environmental Sciences
Advisory Committee
Advisor Name Title
Buss, Glenn R. Committee Chair
Griffey, Carl A. Committee Member
Tolin, Sue A. Committee Member
  • soybean
  • peanut mottle virus
Date of Defense 1998-03-16
Availability unrestricted
Soybean (Glycine max L. Merr.) is one of the most important crops of the world.

Among the various viruses infecting soybean, peanut mottle virus is most commonly found

on soybeans in areas where they are grown in close proximity to peanuts. This research

was conducted with the primary objective of identifying new genes for resistance to

peanut mottle virus. To assign a gene symbol to the resistance gene in cultivar CNS, it was

crossed with 'Peking'. Both the F2 and F2:3 lines segregated in a ratio which is expected

when one dominant and one recessive gene at two different loci are segregating. Previous

studies indicate the presence of one dominant gene in CNS and one recessive gene in

Peking for resistance against PMV. This clearly suggests that Peking and CNS possess

different resistance genes, which are non-allelic to each other. Now that, all the allelism

tests are complete, the resistance gene in CNS can be assigned a gene symbol of Rpv3. PI

486355, a resistant line, was crossed with susceptible cultivars Lee 68 and Essex to study

the mode of inheritance of resistance. This PI was found to possess two independent

dominant genes for resistance to peanut mottle virus. It was also crossed with 'York' and

CNS which are known to have resistance genes at the Rpv1 and Rpv3 loci, respectively.

Data from inoculations of F2 and F2:3 progenies indicated that one gene was allelic to Rpv1

and the other is at a locus different from both Rpv1 and Rpv3. PI 398593 was crossed with Lee 68, York, Peking and CNS for studying the nature of resistance genes present in

it. No certain conclusions can be drawn regarding the nature of the resistance gene(s) at

this stage because of inconsistent behavior of the PI itself. The F2 data of the crosses of PI

398593 with Lee 68, York and CNS supported a recessive nature of the resistance gene

present in the PI. F2 plants of the cross PI 398593 x Peking segregated but, not in the

expected ratio. F2:3 data of only one cross (PI 398593 x York) supported the recessive

nature of the PI resistance gene whereas the other two crosses (PI 398593 x CNS and PI

398593 x Peking) did not support these findings. From the data available it appears that

the resistance is at least partially influenced by the environment. The mode of inheritance

of resistance in PI 96983, 'Kwanggyo', 'Toano', 'Jizuka', 'Raiden' and 'Suweon 97' was

studied by crossing these cultivars with PMV susceptible cultivars and inoculating the F2

populations of these crosses. In all these cultivars resistance is governed by a single

dominant gene. PI 96983, Toano, Jizuka and Suweon 97 were also crossed with York to

determine the allelic relationships. Resistance genes in all these cultivars were found to be

allelic to Rpv1. Since each of the cultivars also has a single dominant gene at the same

locus for resistance to soybean mosaic virus, it is possible that resistance to both viruses is

controlled by the same gene.

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