Breeding for Disease Resistance

Kehr, W. R.; Frosheiser, F. I.; Wilcoxson, R. D.; Barnes, D. K.

doi:10.2134/agronmonogr15.c15

Agronomy Monographs

2015

DOI: 10.2134/agronmonogr15.c15

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Breeding for Disease Resistance

W. R. Kehr

F. I. Frosheiser

R. D. Wilcoxson

et al.

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2018

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Cited by 4 publications

(1 citation statement)

References 79 publications

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“…Enhancing alfalfa productivity in a range of diverse environments is a key objective for many plant breeding programs. In this regard, excellent progress has been made in improving alfalfa's resistance to many key pests and pathogens (Kehr et al, 1972; Sorensen et al, 1972; Lamb et al, 2006). Breeding efforts have also been targeted towards improving forage productivity under diverse climatic conditions (Barnes et al, 1977; Hill et al, 1988; Melton et al, 1989; Al‐Doss and Smith, 1998; Ray et al, 2012).…”

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confidence: 99%

Identification of Consensus Regions Associated with Shoot Biomass Production in the Medicago Genome

et al. 2018

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Identification of common genome regions influencing biomass production in multiple Medicago populations can establish focal points for implementing future marker‐assisted breeding approaches to improve alfalfa (M. sativa L.) forage yield and facilitate identification of candidate genes. The goal of this study was to identify consensus regions associated with biomass production and candidate genes within the context of the M. truncatula Gaertn. genome, based on previous reports of 83 biomass‐affiliated markers and 30 quantitative trait loci (QTL) detected among one M. truncatula and four M. sativa biparental and association mapping populations. The genome positions for 68 markers and all 30 biomass QTL were determined. Ten consensus regions associated with Medicago forage yield in two or more populations were identified. The level of resolution for these regions, however, was not sufficient to clearly identify potential causal candidate genes. Consequently, a targeted set of 208 loci influencing Arabidopsis growth and development were surveyed for their positions in the Medicago genome to identify those which colocalized with biomass markers and QTL intervals. Among 233 homologous genes identified, 51 were located within consensus biomass regions. Potential genes affecting Medicago forage yield variation included those affiliated with phytohormone biosynthesis, transport, and signaling; light responsive developmental phase transitions; and microRNA‐mediated regulation of gene expression. These outcomes provide insight into genetic factors that researchers may wish to target for future validation experiments, and for designing marker‐assisted breeding strategies to improve alfalfa productivity.

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Identification of Consensus Regions Associated with Shoot Biomass Production in the Medicago Genome

et al. 2018

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Performance of North American and Australian lucernes in the Queensland subtropics. 1. Field reaction to important root and crown diseases

Gramshaw¹,

Langdon²,

Lowe³

et al. 1985

Aust. J. Exp. Agric.

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Twenty-three lucernes from North America and five Australian lines were assessed for their sensitivity to root rot (Phytophthora megasperma f. sp. medicaginis), anthracnose/ crown rot (Colletotrichum trifolii) and root canker (Rhizoctonia solani). Plantings were spray irrigated or raingrown on sites representative of the major lucerne environments in southern Queensland. Ratings for each disease discriminated generally the same most susceptible and resistant lines across plantings, although significant sitexline interactions occurred, these being most pronounced for anthracnose. Nevertheless, mean ranking for reaction to each disease conformed to previous assessments conducted under more controlled conditions. For root rot, many of the North American lines showed resistances superior to those of the Australian lines Hunter River, Siro Peruvian and Paravivo, but not to Falkiner and HS Gen 3 Composite. None, however, were rated as having better resistance to anthracnose than Hunter River. Few of the introduced lines had better than moderate levels of combined resistance to root rot and anthracnose, a combination considered important for superior adaptation in the subtropics.

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Effects of Temperature and Light on Development of Anthracnose on Alfalfa

Welty¹

1980

Plant Dis.

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Anthracnose was more severe in susceptible plants incubated at 24 C than at 16 C. Differences in disease severity were not significant among susceptible plants incubated at light/dark temperatures ranging from 14/10 C to 30/26 C after a 3-day infection period at 16 C or 2 and 3 days at 24 C. The severity of anthracnose was similar in susceptible cultivars Team and Saranac infected at either 16 or 24 C. Anthracnose severity was similar in resistant cultivars Arc, Vangard, and Saranac AR when the temperature during infection was 16 C but was more severe in Saranac AR when the temperature during infection was 24 C. Disease severities of susceptible plants incubated in 1,600, 6,500, and 24,800 lux during the infection period were not statistically different.

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Breeding for Disease Resistance

Cited by 4 publications

References 79 publications

Identification of Consensus Regions Associated with Shoot Biomass Production in the Medicago Genome

Identification of Consensus Regions Associated with Shoot Biomass Production in the Medicago Genome

Performance of North American and Australian lucernes in the Queensland subtropics. 1. Field reaction to important root and crown diseases

Effects of Temperature and Light on Development of Anthracnose on Alfalfa

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