Genotype‐isolate interaction for resistance to black stem in sunflower (<i>Helianthus annuus</i>)

Darvishzadeh, Reza; Dechamp-Guillaume, Grégory; Hewezi, Tarek; Sarrafi, A.

doi:10.1111/j.1365-3059.2007.01603.x

Cited by 18 publications

(15 citation statements)

References 26 publications

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“…The method has been used for the identifi cation of isolate-specifi c interactions of Septoria tritici Roberge in Desmaz. in detached leaf tests on wheat (Arraiano and Brown, 2006) and for black stem (caused by Phoma macdonaldii Boerema) resistance in sunfl ower (Helianthus annuus L.) (Darvishzadeh et al, 2007). In both cases, the method was used to analyze diff erences in the quantitative response to specifi c pathogen isolates.…”

Section: Discussionmentioning

confidence: 99%

Identification of Stable Resistance to Powdery Mildew in Wheat Based on Parametric and Nonparametric Methods

2010

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Powdery mildew, caused by Blumeria graminis f. sp. tritici (DC.) E.O. Speer f. sp. Em. Marchal, is an important disease in many wheat (Triticum aestivum L.) growing areas of the world. Because natural mildew epidemics are absent in Mexico, most bread wheat lines from CIMMYT do not carry adequate resistance. Work was therefore initiated to identify breeding lines with partial resistance based on international trial data. A collection of promising lines was tested for resistance under high disease pressure at 13 international locations with natural epidemics. Three different statistical methods were used to assess the stability and overall level of resistance: median polish, the sites regression (SREG) model, and Hühn's nonparametric stability statistics. Although the three methods represent very different approaches to analyzing genotype by environment interaction and phenotypic stability, they arrived at very similar conclusions in terms of identifying lines with a high level of stable disease resistance. Of the 24 lines that were tested, the breeding line ‘Saar’ had the overall highest level of stability combined with good powdery mildew resistance. It represents a highly valuable source of disease resistance because it also has high levels of race‐nonspecific resistance to leaf rust (caused by Puccinia triticina Eriks.) and stripe rust (caused by P. striiformis Westend. f. sp. tritici). The resistance to the three diseases is partly controlled by the general disease resistance loci Lr34/Yr18/Pm38 and Lr46/Yr29/Pm39, and selection for resistance can be aided by closely linked molecular markers.

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Section: Discussionmentioning

confidence: 99%

Identification of Stable Resistance to Powdery Mildew in Wheat Based on Parametric and Nonparametric Methods

2010

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“…The identified QTLs in this experiment have been detected in favourable conditions for disease development (Roustaee et al ., 2000c). In another programme at this laboratory, an experiment has been repeated with 12 genotypes challenged by seven isolates in the same favourable environmental conditions and the difference between the two tests was not significant (Darvishzadeh et al ., 2007). However, any changes in experimental conditions affecting disease development, may have an effect on QTLs.…”

Section: Discussionmentioning

confidence: 99%

“…Each replication consisted of 10–12 seedlings. Pathological tests were performed using the method described by Darvishzadeh et al. (2007).…”

Section: Methodsmentioning

confidence: 99%

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Quantitative trait loci associated with isolate specific and isolate nonspecific partial resistance to Phoma macdonaldii in sunflower

et al. 2007

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Black stem, caused by Phoma macdonaldii , is one of the most important diseases of sunflower in the world. Quantitative trait loci (QTLs) implicated in partial resistance to two single pycnidiospore isolates of P. macdonaldii (MP8 and MP10) were investigated using 99 recombinant inbred lines (RILs) from the cross between sunflower parental lines PAC2 and RHA266. The experimental design was a randomized complete block with three replications. High genetic variability and transgressive segregation were observed among RILs for partial resistance to P. macdonaldii isolates. QTL-mapping was performed using a recently developed high-density SSR/AFLP sunflower linkage map. A total of 10 QTLs were detected for black stem resistance. The phenotypic variance explained by each QTL (R 2 ) was moderate, ranging from 6 to 20%. Four QTLs were common between two isolates on linkage group 5 and 15 whereas the others were specific for each isolate. Regarding isolate-specific and isolate-nonspecific QTLs detected for partial resistance, it is evident that both genetic effects control partial resistance to the disease isolates. This confirms the need to consider different isolates in the black stem resistance breeding programmes. The four SSR markers HA3700, SSU25, ORS1097 and ORS523_1 encompassing the QTLs for partial resistance to black stem isolates could be good candidates for marker assisted selection.

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“…Thus, vigor observations in culture in vitro can explain a part of variation of this trait in nursery and can be used for the early screening of the adult vigor. For Darvishzadeh (2007), the fair correlations could be used to screen some genotypes at early stage.…”

Section: Methodsmentioning

confidence: 99%

Breeding of Hibiscus sabdariffa L.: evaluation of resistance to Fusarium oxysporum Schlecht. Emend. Snyd. and Hans in two varieties

Sié¹,

Charles²,

Diallo³

et al. 2011

ABJNA

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Various diseases such as Fusarium wilt adversely affect the growth of roselle (Hibiscus sabdariffa L.) plant in various parts of the world. Two varieties (sabdariffa, altissima) of this species were inoculated in vitro and under nursery conditons. Non inoculated plants of each variety were used as control plants. The damages caused by the fungal attacks on the growth of plants was measured by their negative impact on the morphological traits such as length, width and fresh weight of leaves. According to the level of this negative impact on in vitro grown plantlets, sabdariffa plantlets were considered as more resistant to Fusarium oxysporum than altissima ones. In nursery, compared to their respective control, the values of the morphological traits of the inoculated plants increased in sabdariffa variety and decreased in altissima one. The inoculated in vitro plantlets of the sabdariffa variety had higher phenol content than those of altissima variety. In nursery, the variations of the total phenol content were negative for the sabdariffa variety and positive for altissima. Negative and highly significant correlations were observed between the resistance traits and the total phenolic content. F. oxysporum had no significant effect on photosynthesis of the plants of sabdariffa or altissima varieties.

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Genotype‐isolate interaction for resistance to black stem in sunflower (Helianthus annuus)

Cited by 18 publications

References 26 publications

Identification of Stable Resistance to Powdery Mildew in Wheat Based on Parametric and Nonparametric Methods

Identification of Stable Resistance to Powdery Mildew in Wheat Based on Parametric and Nonparametric Methods

Quantitative trait loci associated with isolate specific and isolate nonspecific partial resistance to Phoma macdonaldii in sunflower

Breeding of Hibiscus sabdariffa L.: evaluation of resistance to Fusarium oxysporum Schlecht. Emend. Snyd. and Hans in two varieties

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