QTL Analysis of ICA Bunsi‐Derived Resistance to White Mold in a Pinto × Navy Bean Cross

Miklas, Phillip N.; Larsen, Karen M.; Terpstra, Karolyn; Hauf, D.C.; Grafton, K.F.; Kelly, James D.

doi:10.2135/cropsci2006.06.0410

Cited by 32 publications

(40 citation statements)

References 36 publications

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“…This selection method is also well suited for marker-assisted selection (Miklas 2007;Miklas et al 2003). This breeding method is not useful, however, for the improvement of quantitatively inherited traits such as seed yield or tolerance to abiotic stress.…”

Section: Backcrossmentioning

confidence: 99%

Achievements and limitations of contemporary common bean breeding using conventional and molecular approaches

Beaver

Osorno

2009

Euphytica

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Common bean (Phaseolus vulgaris L.) improvement programs have been successful using conventional breeding methods to accomplish a wide array of important objectives. Specific achievements include the extension of range of adaptation of the crop, the development of cultivars with enhanced levels of disease and pest resistance and breeding lines that possess greater tolerance to drought. The most effective breeding method depends on the expression and inheritance of the trait to be selected and the target environment. Many bean improvement programs use molecular markers to facilitate cultivar development. In fact, several recent germplasm releases have used molecular markers to introgress and or pyramid major genes and QTL for disease resistance. Related species (P. coccineus and P. acultifolius) via interspecific hybridizations remain an important albeit long-term source for resistance to economically important diseases. Slow progress has been made in the improvement of traits such as adaptation to low soil fertility and tolerance to high levels of soluble Al in the soil using conventional breeding methods. The inability to directly measure root traits and the importance of genotype 9 environment interaction complicate the selection of these traits. In addition, symbiotic relationships with Rhizobium and mycorrhiza need to be taken into consideration when selecting for enhanced biological N fixation and greater or more efficient acquisition of soil P. Genomic examination of complex traits such as these should help bean breeders devise more effective selection strategies. As integration of genomics in plant breeding advances, the challenge will be to develop molecular tools that also benefit breeding programs in developing countries. Transgenic breeding methods for bean improvement are not well defined, nor efficient, as beans are recalcitrant to regeneration from cell cultures. Moreover, if issues related to consumer acceptance of GMOs cannot be resolved, traits such as herbicide tolerance in transgenic bean cultivars which would help farmers reduce production costs and decrease soil erosion will remain unrealized.

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Section: Backcrossmentioning

confidence: 99%

Achievements and limitations of contemporary common bean breeding using conventional and molecular approaches

Beaver

Osorno

2009

Euphytica

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“…Also, Singh et al (2007) developed A 195 using combined pedigree and bulk breeding methods. Miklas (2007) used molecular-marker-assisted selection to introgress WM-resistant QTL located on chromosome 7 in G 122 and 8 in NY6020-4. Similarly, Ender et al (2008) used marker-assisted selection for WM-resistance QTL located on chromosomes 2 and 7 in two common bean populations involving ICA Bunsi.…”

Section: Introductionmentioning

confidence: 99%

Gamete selection for improving physiological resistance to white mold in common bean

Terán

Singh

2009

Euphytica

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White mold (WM), caused by Sclerotinia sclerotiorum (Lib.) de Bary, is a widespread disease of dry and green bean (Phaseolus vulgaris L.) in North America. Gamete selection (GS) was effective to combine and pyramide resistant genes and quantitative trait loci (QTL) for common bacterial blight. Our objective was to determine the effectiveness of GS to introgress physiological resistance to white mold. Two inter-gene-pool double-cross populations were developed. Selection for WM resistance was practiced from F 1 to F 4 . Thirteen selected F 1:5 breeding lines of each population and their four parents were evaluated. Two separate inoculations were made on each plant 1 week apart using a cut-stem method. The WM reaction was scored at 16, 23, and 33 days post inoculation (DPI) using a scale from 1 (no disease) to 9 (severely diseased or dead). In F 1 , 52% of Pop I (USPT-WM-1/CORN 601//USPT-CBB-1/92BG-7) and 67% of Pop II (Chase/I9365-25//ABL 15/A 195) susceptible plants were discarded. In F 4, only 1.2% of families from Pop I, and 0.9% for Pop II, survived the selection process. An average of 20.5% gain in WM resistance was obtained for both populations in F 4 . Four breeding lines of Pop I had significantly (P = 0.05) lower WM score (4.

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“…Kolkman and Kelly (23) found that genetic resistance in dry bean is quantitatively inherited and complex because it consists of both disease avoidance and physiological mechanisms. Avoidance is manifested in upright and less dense canopies that create a less conducive microclimate for S. sclerotiorum to colonize blossoms and infect the stems (23,29,33).…”

mentioning

confidence: 99%

Variation in Sclerotinia sclerotiorum Bean Isolates from Multisite Resistance Screening Locations

Otto-Hanson

Steadman

Higgins³

et al. 2011

Plant Disease

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There is no complete resistance to Sclerotinia sclerotiorum, cause of white mold in dry bean (Phaseolus vulgaris). Variable resistance expression is one problem in screening for improved white mold resistance. With no previous information in the literature, pathogen variation in multisite screening nurseries was evaluated as one cause of diverse resistance expression. In all, 10 isolates of S. sclerotiorum used in greenhouse screening and 146 isolates collected from nine white mold field screening nurseries in major bean production areas in the United States were compared using mycelial compatibility groupings (MCGs) and an aggressiveness test. These 10 greenhouse screening isolates formed six MCGs. Among 156 field and greenhouse isolates, 64 MCGs were identified and 36 of those were each composed of a single unique isolate. Significant differences in isolate aggressiveness were found between some isolates in different MCGs but the isolates within an MCG did not differ in aggressiveness. High isolate variation found within and between field locations could influence the disease phenotype of putative white mold resistant germplasm. We next compared genotype and phenotype of isolates from screening nurseries and those from producer fields. Variability found in and among screening locations did reflect variability found in the four producer fields sampled. White mold resistance screening can be improved by knowledge of isolate genotypic and phenotypic characteristics.

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QTL Analysis of ICA Bunsi‐Derived Resistance to White Mold in a Pinto × Navy Bean Cross

Cited by 32 publications

References 36 publications

Achievements and limitations of contemporary common bean breeding using conventional and molecular approaches

Achievements and limitations of contemporary common bean breeding using conventional and molecular approaches

Gamete selection for improving physiological resistance to white mold in common bean

Variation in Sclerotinia sclerotiorum Bean Isolates from Multisite Resistance Screening Locations

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