Reaction of two maize synthetics to anthracnose stalk rot and northern corn leaf blight following recurrent selection for resistance to Diplodia stalk rot and European corn borer

Reaction of two maize synthetics to anthracnose stalk rot and northern corn leaf blight following recurrent selection for resistance to Diplodia stalk rot and European corn borer

Two maize (Zea mays) synthetics, BSAA and BSBB, were recurrently selected for resistance to Diplodia (Diplodia maydis) stalk rot (DSR) and leaf feeding caused by the first-generation European corn borer (Ostrinia nubilalis) (ECB), based on the reaction of S1 lines to artificial inoculations of D. ma...

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Bibliographic Details
Published in:Phytopathology Vol. 79; no. 2; pp. 166 - 169
Main Authors: Nyhus, K.A, Russell, W.A, Guthrie, W.D, Martinson, C.A
Format: Journal Article
Language:English
Published: St. Paul, MN American Phytopathological Society 01-02-1989
Subjects:
Agronomy. Soil science and plant productions
ANTHRACNOSE
ANTRACNOSIS
Biological and medical sciences
COLLETOTRICHUM
DEPERISSEMENT
DIPLODIA
Fundamental and applied biological sciences. Psychology
Generalities
Genetics and breeding of economic plants
OSTRINIA NUBILALIS
Pest animals
Pest resistance
RESISTANCE AUX MALADIES
RESISTANCE AUX RAVAGEURS
RESISTENCIA A LA ENFERMEDAD
RESISTENCIA A LAS PLAGAS
Seeds and other planting stocks
SELECCION
SELECTION
TIZON
Varietal selection. Specialized plant breeding, plant breeding aims
ZEA MAYS
Disease development
Colletotrichum graminicola
Monocotyledones
Diplodia maydis
Mycosis
United States
Insecta
Ostrinia nubilalis
Phytopathogen
North America
Cereal crop
Fungi
Inoculation
Pyralidae
Pest
Gramineae
America
Angiospermae
Fungi Imperfecti
Synthetic variety
Thallophyta
Zea mays
Logarithmic function
Infection
Iowa
Sensitivity resistance
Recurrent selection
Arthropoda
Lepidoptera
Plant origin
Pest resistance
Spermatophyta
Infestation
Invertebrata
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Summary:Two maize (Zea mays) synthetics, BSAA and BSBB, were recurrently selected for resistance to Diplodia (Diplodia maydis) stalk rot (DSR) and leaf feeding caused by the first-generation European corn borer (Ostrinia nubilalis) (ECB), based on the reaction of S1 lines to artificial inoculations of D. maydis and artificial infestations of the ECB. This study was conducted to determine if plant factors contributing to DSR and ECB resistance also conferred resistance to anthracnose stalk rot (ASR) caused by Colletotrichum graminicola and northern corn leaf blight (NLB) caused by Exserohilum turcicum. Highly significant linear improvements in ASR resistance were observed over cycles (C0 to C4) of selection in both synthetics. These improvements mirrored the gains reported previously for DSR resistance in BSAA and BSBB and suggested that a genetic correlation exists between DSR resistance and ASR resistance in these populations. NLB severity ratings were recorded on six dates throughout the growing season. A natural logarithm transformation was used to describe the disease progress curve for each of the C0 to C4 populations of each synthetic. Linear regression of lnNLB ratings on lnDATE (days after inoculation) accounted for more than 97% of the variation among entries when averaged over replications. Our results showed no concomitant improvement in NLB resistance over cycles of selection for ECB resistance, contradicting previous reports that 2,4-dihydroxy-7-methoxy-2H-1,4-benzoxazin-3-one (DIMBOA), a know biochemical factor in leaf-feeding resistance, confers resistance to NLB
Bibliography:F30
8911929
H10
H20
ISSN:0031-949X
1943-7684
DOI:10.1094/Phyto-79-166