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Document Type

Thesis - University Access Only

Award Date

1989

Degree Name

Master of Science (MS)

Department / School

Plant Pathology

First Advisor

Marty Carson

Abstract

It is possible for Northern Corn Leaf Blight (NCLB) to cause major yield losses in years with adequate rainfalls that promote the growth and sporulation of the causal organism, Exserohilum turcicum (Pass.) Leonard & Suggs. One of the most effective methods of control for this disease is the use of corn (Zea mays L.) hybrids that are resistant to it. This study is an attempt to clarify the genetic components of partial resistance in corn to NCLB by mapping those components to chromosome arms associated with resistance. A series of reciprocal translocation stocks, in a susceptible inbred line background, were crossed with the resistant inbred line Mo17 in order to obtain F2 populations that would segregate for resistance and susceptibility. Measurements of several components of partial resistance were made in order to localize these traits to specific chromosome arms using the translocation breakpoints as mapping markers. The components of interest are infection efficiency, incubation period, lesion rate, lesion number, lesion size, sporulation and the total expression of these-components, disease severity.

Library of Congress Subject Headings

Corn -- Diseases and pests

Corn -- Genetics

Format

application/pdf

Number of Pages

54

Publisher

South Dakota State University

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