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Variability and Genetics of Rhizoctonia solani Resistance in Table Beet.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Variability and Genetics of Rhizoctonia solani Resistance in Table Beet./
Author:	Wigg, Katharina Snitker.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	219 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-04, Section: B.
Contained By:	Dissertations Abstracts International83-04B.
Subject:	Plant sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28413883
ISBN:	9798460418886

Variability and Genetics of Rhizoctonia solani Resistance in Table Beet.
Wigg, Katharina Snitker.

Variability and Genetics of Rhizoctonia solani Resistance in Table Beet. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 219 p.

Source: Dissertations Abstracts International, Volume: 83-04, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2021.

This item must not be sold to any third party vendors.

A significant detriment to table beet (Beta vulgaris ssp. vulgaris) production is the soilborne fungus, Rhizoctonia solani. Rhizoctonia root and crown rot causes dark rotted portions of the root, leading to losses in the field and during processing. Fungicide applications and cultural methods are used by farmers but show limited success. This dissertation focuses on understanding the genetic control of reaction to R. solani with the goal of improving host plant resistance.Greenhouse screening experiments were developed to evaluate a wide array of table beet germplasm, ranging from Plant Introductions, to commercial cultivars, and publicly available inbreds. Several accessions displayed similar levels of resistance to previously described resistant sugar beet controls, demonstrating resistance available in existing table beet germplasm that can be leveraged in germplasm improvement. To streamline whole plant analyses for this pathogen, a series of experiments were conducted with root slices inoculated with the R. solani fungus. Genotypes responded differentially and, in some cases, consistently in these root slice assays, but substantial changes in rank across experiments were also measured. Limited correlations were measured between these experiments and the greenhouse disease screens, indicating each screen measures different responses of the beet in the presence of the fungus.Quantitative trait loci (QTL) associated with resistance to R. solani were detected in two F2:3 mapping populations using resistant and susceptible table and sugar beet inbreds as parents. Six plants from each of 68 and 79 F2:3 families were evaluated in a juvenile plant greenhouse disease screen. A QTL on Chromosome 2 in each of the populations was detected using interval mapping, in both cases accounting for 30% of the phenotypic variation. This is the first report of a disease resistance QTL in table beet, as well as the first usage of a genome assembly in table beet, based on the inbred line W357B. These QTL can be used for marker assisted selection to increase host resistance to R. solani in table beet breeding programs.

ISBN: 9798460418886Subjects--Topical Terms:

3173832
Plant sciences.
Subjects--Index Terms:

Beta vulgaris

Variability and Genetics of Rhizoctonia solani Resistance in Table Beet.
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520 $a A significant detriment to table beet (Beta vulgaris ssp. vulgaris) production is the soilborne fungus, Rhizoctonia solani. Rhizoctonia root and crown rot causes dark rotted portions of the root, leading to losses in the field and during processing. Fungicide applications and cultural methods are used by farmers but show limited success. This dissertation focuses on understanding the genetic control of reaction to R. solani with the goal of improving host plant resistance.Greenhouse screening experiments were developed to evaluate a wide array of table beet germplasm, ranging from Plant Introductions, to commercial cultivars, and publicly available inbreds. Several accessions displayed similar levels of resistance to previously described resistant sugar beet controls, demonstrating resistance available in existing table beet germplasm that can be leveraged in germplasm improvement. To streamline whole plant analyses for this pathogen, a series of experiments were conducted with root slices inoculated with the R. solani fungus. Genotypes responded differentially and, in some cases, consistently in these root slice assays, but substantial changes in rank across experiments were also measured. Limited correlations were measured between these experiments and the greenhouse disease screens, indicating each screen measures different responses of the beet in the presence of the fungus.Quantitative trait loci (QTL) associated with resistance to R. solani were detected in two F2:3 mapping populations using resistant and susceptible table and sugar beet inbreds as parents. Six plants from each of 68 and 79 F2:3 families were evaluated in a juvenile plant greenhouse disease screen. A QTL on Chromosome 2 in each of the populations was detected using interval mapping, in both cases accounting for 30% of the phenotypic variation. This is the first report of a disease resistance QTL in table beet, as well as the first usage of a genome assembly in table beet, based on the inbred line W357B. These QTL can be used for marker assisted selection to increase host resistance to R. solani in table beet breeding programs.
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