Powdery mildew resistance genes in Latvian barley varieties

Dreiseitl, Antonín; Rashal, Isaak

doi:10.1023/b:euph.0000013372.65004.15

Cited by 16 publications

(18 citation statements)

References 19 publications

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“…The pedigree of variety 'Orbit' reported by the breeder (Dreiseitl & Jørgensen 2000) is erroneous because the published parents of this variety possess the genes Mla8, Mla9 and Mlk1, whereas Mla6, Mlat and MlLa were detected in breeding stocks. The resistance in the parents of variety 'Malva' (Dreiseitl & Rashal 2004) has not been studied and cannot, therefore, be used to confirm the results. The pedigree of variety 'Tocada' is very complex and does not clarify the origins of the three resistance genes that we identified, including one from an unknown source.…”

Section: Discussionmentioning

confidence: 99%

“…Based on current experience with postulating resistance genes in barley to powdery mildew (Dreiseitl & Jørgensen 2000 and others) or leaf rust pathogens (Dreiseitl & Steffenson 2000), there are two major constraints. First, heterogeneous varieties are mostly composed of two lines although three lines are not uncommon (Dreiseitl & Rashal 2004), while a larger number of lines with various resistances to the pathogen is rare. Second, mechanical varietal admixtures should be considered.…”

Section: Discussionmentioning

confidence: 99%

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Postulation of resistance genes to barley diseases in heterogeneous varieties

Dreiseitl

2011

Biologia

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Resistance to causal agents of diseases is an important varietal characteristic that influences the management practice of crop plants and thus production costs of commodities. At present, almost all European barley varieties possess at least one major gene for resistance to powdery mildew. After hybridizing selected parental varieties, resistance genes often segregate in subsequent generations and, therefore, some varieties comprise lines that differ in the number or combinations of resistance genes. The objective of this research was to describe the various methods available for postulating resistance genes to pathogens in heterogeneous varieties using resistance to powdery mildew of barley as an example. Four spring barleys ('Orbit', 'Malva', 'Tocada' and CLE 233), and a six-row variety of winter barley, F 12872, were screened. For postulating resistance genes, several testing procedures and many Blumeria graminis f.sp. hordei isolates were used. Minimum amounts of seed were determined and different methods of obtaining homogeneous seed samples from heterogeneous varieties were compared. It was found that 'Orbit' and 'Malva' are composed of three and 'Tocada', CLE 233 and F 12872 of two lines with different resistances to powdery mildew. Problems of postulating resistance genes in heterogeneous varieties and the advantages of testing leaf segments instead of young plants are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Postulation of resistance genes to barley diseases in heterogeneous varieties

Dreiseitl

2011

Biologia

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“…The two compared sets differ above all in the percentage of heterogeneous varieties. Their proportions were 5 and 29% in the foreign varieties and Czech and Slovak breeding lines, respectively (for instance, the proportion in Latvian cultivars was up to 53% (DREISEITL & RASHAL 2004)). BOESEN et al (1996); if the symbol "+" is in a column, the frequency of corresponding resistance found in homogeneous varieties is given first followed by the frequency of the given resistance in heterogeneous varieties…”

Section: Discussionmentioning

confidence: 99%

Biennial Workshop on the Smut Fungi

Dumalasová¹

2006

CZECH J GENET PLANT

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Abstract:In 1993-2005, resistance to powdery mildew was studied in 168 foreign varieties of spring barley included in Czech Official Trials in that period. Sixteen known resistances to powdery mildew were identified (Ab, Al, Ar, HH, Kw, La, Ly, MC, Mlo, N81, Ri, Ru, Sp, St, Tu, and We). Unknown resistances were found in 32 varieties, in nine of which these resistances were effective against all used pathotypes of the pathogen. Seven varieties (= 5%) exhibited heterogeneity in the examined trait, i.e. they are composed of lines (usually of two) with different resistances to powder mildew. The resistance Mlo, which was found in 75 homogeneous varieties (= 46%), dominated in the set. The resistances Ru, We, Ar and La were frequently present. The examined set includes 53% of varieties resistant to all used indigenous pathotypes of the pathogen.

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“…(2000), Dreiseitl & Rashal (2004), Dreiseitl (2006), Tueryapina et al (1997) riod [2004][2005]. The 84 spring barley genotypes tested were Lithuania-registered cultivars, cultivars from the genetic resources collection, and new cultivars used for initial breeding.…”

Section: Methodsmentioning

confidence: 99%

Field resistance of spring barley cultivars to powdery mildew in Lithuania

Liatukas

Leistrumaitė

2007

Biologia

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During vegetative period 2004-2005 powdery mildew (Erysiphe graminis DC. f. sp. hordei Em. Marchal) field resistance of spring barley cultivars was investigated at the Lithuanian Institute of Agriculture. The spring barley genotypes tested were Lithuania-registered cultivars, cultivars from genetic resources collection, and the new cultivars used for initial breeding. In total, 23 resistance genes were present in the 84 cultivars studied. Among mono-genes only mlo and 1-B-53 showed very high resistance. Slight powdery mildew necroses (up to 3 scores) formed on cultivars possessing these genes. The maximal powdery mildew (PM) severity reached a score of 8.5 and the area under disease progress curve (AUDPC) a value of 1216.8. The cultivars 'Primus', 'Astoria', 'Power', 'Harrington' and 'Scarlett' were the most resistant among the non mlo cultivars. Severity of PM on 'Primus' reached a score of 3.5 (3.0 of PM necrosis) in average, the other cultivars were diseased from 4.5 (3.0) to 5.0 (2.0). The AUDPC values for these cultivars except 'Scarlett' were the lowest (85.0-145.3) among the other cultivars. The highest contrast in development of the other leaf diseases was between highly resistant and susceptible to PM cultivar groups. The fast development of PM depressed development of the other diseases 4.7 times.

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Powdery mildew resistance genes in Latvian barley varieties

Cited by 16 publications

References 19 publications

Postulation of resistance genes to barley diseases in heterogeneous varieties

Postulation of resistance genes to barley diseases in heterogeneous varieties

Biennial Workshop on the Smut Fungi

Field resistance of spring barley cultivars to powdery mildew in Lithuania

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