Untitled

Bisognin, Dílson Antônio; Douches, David S.; Jastrzebski, K.; Kirk, W. W.

doi:10.1023/a:1015763207980

Cited by 21 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zhang and Kim (2007) collected 261 Pi isolates during 3 years from Korea and found all races carried multiple virulence genes and showed virulence to the potato differential plants R1 , R3 , R5 , R6 , R7 , R10, and R11 , but not on R8 and R9 . Also Bisognin et al (2002) found Pi isolates that were virulent on all R gene differentials except R9 in DLA and on both R8 and R9 in field trials. More recently, it was shown that virulence towards R8 and R9 differential plants is relatively rare in European Pi populations (Chmielarz et al 2010).…”

Section: Introductionmentioning

confidence: 97%

Broad spectrum late blight resistance in potato differential set plants MaR8 and MaR9 is conferred by multiple stacked R genes

et al. 2011

View full text Add to dashboard Cite

Phytophthora infestans is the causal agent of late blight in potato. The Mexican species Solanum demissum is well known as a good resistance source. Among the 11 R gene differentials, which were introgressed from S. demissum, especially R8 and R9 differentials showed broad spectrum resistance both under laboratory and under field conditions. In order to gather more information about the resistance of the R8 and R9 differentials, F1 and BC1 populations were made by crossing Mastenbroek (Ma) R8 and R9 clones to susceptible plants. Parents and offspring plants were examined for their pathogen recognition specificities using agroinfiltration with known Avr genes, detached leaf assays (DLA) with selected isolates, and gene-specific markers. An important observation was the discrepancy between DLA and field trial results for Pi isolate IPO-C in all F1 and BC1 populations, so therefore also field trial results were included in our characterization. It was shown that in MaR8 and MaR9, respectively, at least four (R3a, R3b, R4, and R8) and seven (R1, Rpi-abpt1, R3a, R3b, R4, R8, R9) R genes were present. Analysis of MaR8 and MaR9 offspring plants, that contained different combinations of multiple resistance genes, showed that R gene stacking contributed to the Pi recognition spectrum. Also, using a Pi virulence monitoring system in the field, it was shown that stacking of multiple R genes strongly delayed the onset of late blight symptoms. The contribution of R8 to this delay was remarkable since a plant that contained only the R8 resistance gene still conferred a delay similar to plants with multiple resistance genes, like, e.g., cv Sarpo Mira. Using this “de-stacking” approach, many R gene combinations can be made and tested in order to select broad spectrum R gene stacks that potentially provide enhanced durability for future application in new late blight resistant varieties.Electronic supplementary materialThe online version of this article (doi:10.1007/s00122-011-1757-7) contains supplementary material, which is available to authorized users.

show abstract

Section: Introductionmentioning

confidence: 97%

Broad spectrum late blight resistance in potato differential set plants MaR8 and MaR9 is conferred by multiple stacked R genes

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Evaluation of the reaction of potato differentials to over 5,000 P. infestans isolates, collected in various parts of the world, showed that the resistances of differentials Ma R5 , Ma R8 and Ma R9 were most durable (Swiezynski et al 2000). Also, P. infestans isolates derived from clonal lineage US8, the most common and aggressive genotype of P. infestans present in the US (Fry and Goodwin 1997) overcame all known R gene differentials except Ma R8 and Ma R9, both in detached leaf assay and in field trials (Bisognin et al 2002). …”

Section: Introductionmentioning

confidence: 99%

Mapping of the S. demissum late blight resistance gene R8 to a new locus on chromosome IX

Arens

Kim

et al. 2011

Theor Appl Genet

View full text Add to dashboard Cite

The use of resistant varieties is an important tool in the management of late blight, which threatens potato production worldwide. Clone MaR8 from the Mastenbroek differential set has strong resistance to Phytophthora infestans, the causal agent of late blight. The F1 progeny of a cross between the susceptible cultivar Concurrent and MaR8 were assessed for late blight resistance in field trials inoculated with an incompatible P. infestans isolate. A 1:1 segregation of resistance and susceptibility was observed, indicating that the resistance gene referred to as R8, is present in simplex in the tetraploid MaR8 clone. NBS profiling and successive marker sequence comparison to the potato and tomato genome draft sequences, suggested that the R8 gene is located on the long arm of chromosome IX and not on the short arm of chromosome XI as was suggested previously. Analysis of SSR, CAPS and SCAR markers confirmed that R8 was on the distal end of the long arm of chromosome IX. R gene cluster directed profiling markers CDPSw54 and CDPSw55 flanked the R8 gene at the distal end (1 cM). CDPTm21-1, CDPTm21-2 and CDPTm22 flanked the R8 gene on the proximal side (2 cM). An additional co-segregating marker (CDPHero3) was found, which will be useful for marker assisted breeding and map based cloning of R8.

show abstract

Empirical evaluation of an entropy‐based approach to estimation variation of software development effort

Koutbi

Idri

Abran

2018

J Software Evolu Process

View full text Add to dashboard Cite

As effort estimation has gained increasing attention, most of the techniques proposed have focused on the accuracy of effort estimates. Yet no clear conclusions have been drawn on which techniques perform best in all contexts. We propose an entropy‐based approach to effort estimate variation caused by measurement and model error sources whatever the effort estimation technique used. The proposed approach was empirically evaluated by exploring three entropy formulae, four interpolation methods, and two analogy‐based effort estimation approaches (crisp and fuzzy analogy) over seven datasets using the Jackknife evaluation method. The obtained results show that the three entropy formulae have in general the same positive influence on the performance of the entropy‐based approach measured in terms of absolute error of effort deviation. In addition, the spline interpolation outperformed all other interpolation methods, using any of the entropy formulae. Moreover, achievement percentages of the best variants of our approach closely approximated those of the Gaussian distribution confirming that the Gaussian distribution is useful for characterizing effort estimate variation.

show abstract

Untitled

Cited by 21 publications

References 23 publications

Broad spectrum late blight resistance in potato differential set plants MaR8 and MaR9 is conferred by multiple stacked R genes

Broad spectrum late blight resistance in potato differential set plants MaR8 and MaR9 is conferred by multiple stacked R genes

Mapping of the S. demissum late blight resistance gene R8 to a new locus on chromosome IX

Empirical evaluation of an entropy‐based approach to estimation variation of software development effort

Contact Info

Product

Resources

About