Association between dwarfing genes ?Rht1? and ?Rht2? and resistance toSeptoria tritici Blotch in winter wheat (Triticum aestivum L. em Thell)

Becerril, Baltazar; Scharen, A. L.; Kronstad, W. E.

doi:10.1007/bf01186089

Cited by 30 publications

(24 citation statements)

References 14 publications

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“…The observed increase in intensity of Septoria spp. in different parts of the world has been attributed to the increased use of early-maturing short-strawed cultivars, caused by changes in resistance as well as changes in canopy structure and dynamics (Bahat et al, 1980;Scott et al, 1985;Baltazar et al, 1990;Eyal and Talpaz, 1990). Although crop stature gradually changed in the Netherlands between 1974 and 1986, it is unlikely that this caused the observed increase in prevalence of Septoria spp.…”

Section: Discussionmentioning

confidence: 80%

Survey of cereal diseases and petts in the Netherlands. 5. Occurrence of Septoria spp. in winter wheat

Daamen¹,

Stol²

1992

Netherlands Journal of Plant Pathology

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Data of the annual surveys of circa 100 commercial winter wheat fields were compiled to describe epidemics of Septoria spp. in the Netherlands during [1974][1975][1976][1977][1978][1979][1980][1981][1982][1983][1984][1985][1986]. In May, during the first node stage, S. tritici was dominant while S. nodorum was virtually absent. In July, during ripening, S. tritici on average dominated over S. nodorum, though in the most continental districts of the country S. nodorum predominated.In May between 1974 and 1984, on average 56% of the fields showed leaf infections by Septoria spp., while in July between 1975 and 1986, on average 83% of the fields showed leaf infections.Prevalence of Septoria spp. has increased during the surveys. Annual intensity of Septoria spp. in winler wheat crops was positively correlated with precipitation and negatively with average monthly sunshine duration during the harvest month August of the previous growing season. The correlation with sunshine during August could indicate that ascospores play a major role in subsequent epidemics; but whether it is a causal relation remains to be answered.

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Section: Discussionmentioning

confidence: 80%

Survey of cereal diseases and petts in the Netherlands. 5. Occurrence of Septoria spp. in winter wheat

Daamen¹,

Stol²

1992

Netherlands Journal of Plant Pathology

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“…Thus, flag leaves often will emerge on early-maturing cultivars when weather is conducive for infection . Genetic linkages between earliness and susceptibility to M. graminicola also have been reported as a possible explanation for this association (Baltazar et al 1990;Rosielle and Boyd 1985). Many semidwarf wheat cultivars possess one or both of the Norin 10 height-reducing genes (Rht 1 or Rht 2 ) in their parentage (Gale et al 1981).…”

Section: Discussionmentioning

confidence: 94%

“…However, in some cases, early maturity was highly associated with susceptibility to M. graminicola (Baltazar et al 1990;Rosielle and Boyd 1985;. In regions where STB is a major problem, disease-favorable conditions with cool temperatures and rain are more probable early in the spring.…”

Section: Discussionmentioning

confidence: 97%

Molecular mapping of Stb1, a potentially durable gene for resistance to septoria tritici blotch in wheat

et al. 2004

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Septoria tritici blotch (STB), caused by the ascomycete Mycosphaerella graminicola (anamorph Septoria tritici), was the most destructive disease of wheat in Indiana and adjacent states before deployment of the resistance gene Stb1 during the early 1970s. Since then, Stb1 has provided durable protection against STB in widely grown wheat cultivars. However, its chromosomal location and allelic relationships to most other STB genes are not known, so the molecular mapping of Stb1 is of great interest. Genetic analyses and molecular mapping were performed for two mapping populations. A total of 148 F1 plants (mapping population I) were derived from a three-way cross between the resistant line P881072-75-1 and the susceptible lines P881072-75-2 and Monon, and 106 F6 recombinant-inbred lines (mapping population II) were developed from a cross between the resistant line 72626E2-12-9-1 and the susceptible cultivar Arthur. Bulked-segregant analysis with random amplified polymorphic DNA (RAPD), amplified fragment length polymorphism (AFLP), and microsatellite or simple-sequence repeat (SSR) markers was conducted to identify those that were putatively linked to the Stb1 gene. Segregation analyses confirmed that a single dominant gene controls the resistance to M. graminicola in each mapping population. Two RAPD markers, G7(1200) and H19(520), were tightly linked to Stb1 in wheat line P881072-75-1 at distances of less than 0.68 cM and 1.4 cM, respectively. In mapping population II, the most closely linked marker was SSR Xbarc74, which was 2.8 cM proximal to Stb1 on chromosome 5BL. Microsatellite loci Xgwm335 and Xgwm213 also were proximal to Stb1 at distances of 7.4 cM and 8.3 cM, respectively. The flanking AFLP marker, EcoRI-AGC/ MseI-CTA-1, was 8.4 cM distal to Stb1. The two RAPD markers, G7(1200) and H19(520), and AFLP EcoRI-AGC/ MseI-CTA-1, were cloned and sequenced for conversion into sequence-characterized amplified region (SCAR) markers. Only RAPD allele H19(520) could be converted successfully, and none of the SCAR markers was diagnostic for the Stb1 locus. Analysis of SSR and the original RAPD primers on several 5BL deletion stocks positioned the Stb1 locus in the region delineated by chromosome breakpoints at fraction lengths 0.59 and 0.75. The molecular markers tightly linked to Stb1 could be useful for marker-assisted selection and for pyramiding of Stb1 with other genes for resistance to M. graminicola in wheat.

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“…Linkage between the Rht2 dwarfing gene and resistance to Septoria tritici in wheat has been suggested by Baltazar et al (1990) who showed that isogenic lines of wheat containing the Rht1 gene were more susceptible than those with the Rht2 gene. In the present study there was no indication that isogenic lines of Maris Huntsman or Maris Widgeon containing Rht1 had more severe symptoms of FEB than those containing Rht2.…”

Section: Discussionmentioning

confidence: 99%

Relationship between cultivar height and severity of Fusarium ear blight in wheat

et al. 1999

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A significant negative relationship between tiller height and resistance to Fusarium ear blight (FEB), following inoculation, was observed in 17 cultivars of winter wheat in the 1995/96 growing season. Tall cultivars such as Kraka and Spark showed fewer symptoms of FEB (6 and 4%) than the shorter cultivars Brigadier and Virtue (35 and 51%). To determine if this relationship was caused by a genetic association or an effect of the microclimate, height and disease were measured in segregating populations derived from tall × short cultivars and humidity was measured in near-isogenic lines with and without the Rht1 and Rht2 dwarfing genes. Among random F 3 populations there was a clear tendency for tall strawed lines to show less severe disease symptoms than shorter strawed lines following inoculation. The effect of the individual dwarfing genes Rht1 and Rht2 on the severity of FEB was also studied in an inoculation trial using a number of near-isogenic lines of Maris Huntsman and Maris Widgeon. Within isogenic lines of Maris Huntsman, there was a clear tendency for tall straw to be associated with fewer symptoms, but this was not apparent within lines of Maris Widgeon. Monitoring relative humidity at ear height in a short and tall isogenic line of Maris Huntsman revealed no significant differences between these genotypes from GS 65 to GS 85, suggesting that microclimate cannot explain differences in severity of FEB between these lines. It is suggested that there are independent genes affecting the severity of FEB that may allow plant breeders to select resistant cultivars of any height.

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Association between dwarfing genes ?Rht1? and ?Rht2? and resistance toSeptoria tritici Blotch in winter wheat (Triticum aestivum L. em Thell)

Cited by 30 publications

References 14 publications

Survey of cereal diseases and petts in the Netherlands. 5. Occurrence of Septoria spp. in winter wheat

Survey of cereal diseases and petts in the Netherlands. 5. Occurrence of Septoria spp. in winter wheat

Molecular mapping of Stb1, a potentially durable gene for resistance to septoria tritici blotch in wheat

Relationship between cultivar height and severity of Fusarium ear blight in wheat

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