Virulence spectrum to barley (Hordeum vulgare L.) in isolates of Rhynchosporium secalis from Syria

Arabi, M. I. E.; Al-Shehadah, E.; Jawhar, M.

doi:10.1007/bf03356323

Cited by 6 publications

(8 citation statements)

References 13 publications

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“…Eventually, the durable resistance of ND B112 was overcome by the emergence of a new pathotype identified by Leng et al (2016) and designated pathotype 7. The occurrence of spot blotch pathotypes has been reported in several studies from different regions of the world (Arabi & Jawhar, 2002Ghazvini & Tekauz, 2007;Meldrum et al, 2004). Breeding for resistance is an effective mean for controlling the disease and so far three major resistance loci have been mapped, namely Rcs 6/Scs 6, Rbs 7 and Rcs 5 located on chromosomes 1H, 6H and 7H, respectively (Drader et al, 2009;Leng et al, 2018;Wang et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Genome‐wide association studies in a barley (Hordeum vulgare) diversity set reveal a limited number of loci for resistance to spot blotch (Bipolaris sorokiniana)

et al. 2019

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The fungal pathogen Bipolaris sorokiniana (Sacc.) Shoem. (teleomorph: Cochliobolus sativus (Ito &Kurib.) Drechs. ex Dastur) is present in all cereal growing regions with warm and humid conditions, but its importance is also increasing in the Americas and Europe (Gupta et al., 2018). Bipolaris sorokiniana is the causal agent of a number of diseases such as common root rot, seedling blight, black point and spot blotch (Kumar et al., 2002). This hemi-biotrophic fungus has a wide host range and is pathogenic on a number of plant species, such as bread and durum wheat (Triticum aestivum and T. durum), barley (Hordeum vulgare), triticale (x Triticosecale), rye (Secale cereal), maize (Zea mays), rice (Oryza sativa), pearl and fox millet (Pennisetum glaucum and Setaria italica) and several other wild grasses (Acharya, Dutta, & Pradhan, 2011; Gupta et al., 2018; Kumar et al., 2002). First reported in 1914, it became an important pathogen mainly with the beginning of the Green Revolution when semi-dwarf wheat cultivars turned out to be highly susceptible

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Section: Discussionmentioning

confidence: 99%

Genome‐wide association studies in a barley (Hordeum vulgare) diversity set reveal a limited number of loci for resistance to spot blotch (Bipolaris sorokiniana)

et al. 2019

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“…sorokiniana is a major constraint of wheat and barley in a vast region including South Asia where the hot, humid environment is conducive for spot blotch development (Joshi and Chand 2002;Joshi et al 2004Joshi et al , 2007. The presence of moderate or weaker isolates could conceivably interfere with identification of genotypes that are highly resistant or immune to B. sorokiniana (Arabi and Jawhar 2002). Therefore, use of the most aggressive isolates of pathogen populations, individually or in a mixture and under the proper environment, is necessary to identify the desired levels of resistance.…”

Section: Resultsmentioning

confidence: 98%

A new technique for monoconidial culture of the most aggressive isolate in a given population of Bipolaris sorokiniana, cause of foliar spot blotch in wheat and barley

Kumar

Chand

Prasad

et al. 2007

World J Microbiol Biotechnol

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We developed a new technique for monoconidial culture of the most aggressive isolate in a given population of Bipolaris sorokiniana, to facilitate the evaluation of spot blotch resistance in wheat and barley. Blotched portions of infected barley leaves were placed on a glass slide in a moist chamber for production of conidia by associated fungal hyphae. Conidia were collected separately and grown on water agar discs. Individual water agar discs having conidium growth were inoculated on barley leaves. The conidium producing the earliest symptom with the largest lesion was considered most aggressive. This lesion was incubated in a moist chamber and the conidial offspring were tested for pathogenicity. When a uniform infection was observed, a small piece of the lesion was cut using a sterilized scalpel, surface sterilized with NaOCl, and inoculated in the centre of Petri dishes containing potato dextrose agar medium. The inoculated Petri dishes were incubated at 25 ± 1°C to yield monoconidial cultures of the most aggressive isolate. Variability in symptom expression caused by the most aggressive isolate of a given population was much less than variability in symptom expression caused by all isolates collectively. The techniques will be useful for plant pathologists and breeders in screening for spot blotch resistance in wheat and barley.

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“…In contrast to Abang et al (2006) study, Arabi et al (2008 tested 63 isolates of R. secalis on Igri and 5 other cultivars and reported that Igri which carry BRR4 resistance gene showed resistant reaction to the majority of 46 isolates. Moreover, in Syria, Arabi et al (2009) assessed 115 isolates of scald against 10 barley differential genotypes. They found Igri and Tadmor cultivars as the most resistant genotypes.…”

Section: Discussionmentioning

confidence: 99%

Determination of the pathotypes of Rhynchosporium commune (Zaffarona, McDonald & Linde) in some regions of Turkey

Azamparsa¹,

Karakaya²

2020

Bitki Koruma Bülteni

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Barley scald, caused by the fungal pathogen Rhynchosporium commune is the most important disease of barley in the world and in Turkey. Surveys were conducted during 2012, 2013, and 2014 in different regions of Turkey. Isolations were accomplished from diseased leaves and from these fifty-two R. commune single spore isolates were selected. A total of 30 scald pathotypes were distinguished based on virulence on 17 barley differential set cultivars. Eighteen, 14, 6, and 1 of these pathotypes were from Central Anatolia, Southeast Anatolia, Aegean, and the Black Sea regions of Turkey, respectively. Twenty, 5, 1, 3, and 1 of these pathotypes were represented by 20, 2, 3, 4, and 7 isolates, respectively. None of the pathotypes was virulent on all 17 barley differential cultivars and two susceptible control cultivars. The most virulent pathotypes (pathotypes 29 and 30) were obtained from Manisa-Kula (13-203) and Gaziantep-Subağı (GPS71U) locations and the least virulent pathotype (pathotype 1) was obtained from Sivas-Gemerek (GPS31) and Sivas-Ulaş (NKT20) locations of Turkey. Among 17 barley differential cultivars, Jet and Abyssinia were susceptible to 1 pathotype, Osiris, Atlas 46, and Forrajera were susceptible to 3 pathotypes, La Mesita and Bey were susceptible to 7 pathotypes, Trebi was susceptible to 9 pathotypes, Pirate was susceptible to 10 pathotypes, Modoc was susceptible to 11 pathotypes, Kitchin and Igri were susceptible to 12 pathotypes, Armelle and Astrix were susceptible to 19 pathotypes, Athene was susceptible to 21 pathotypes, Steudelli was susceptible to 24 pathotypes and Digger was susceptible to 25 pathotypes. Among barley differential cultivars, Jet and Abyssinia cultivars were found as the most resistant, and Digger and Steudelli cultivars were the most susceptible cultivars. Two susceptible control cultivars Bülbül 89 and Efes 3 were found susceptible to 93% of scald pathotypes. It appears that considerable variation exists among the Turkish R. commune isolates obtained from some barley growing areas of Turkey.

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Virulence spectrum to barley (Hordeum vulgare L.) in isolates of Rhynchosporium secalis from Syria

Cited by 6 publications

References 13 publications

Genome‐wide association studies in a barley (Hordeum vulgare) diversity set reveal a limited number of loci for resistance to spot blotch (Bipolaris sorokiniana)

Genome‐wide association studies in a barley (Hordeum vulgare) diversity set reveal a limited number of loci for resistance to spot blotch (Bipolaris sorokiniana)

A new technique for monoconidial culture of the most aggressive isolate in a given population of Bipolaris sorokiniana, cause of foliar spot blotch in wheat and barley

Determination of the pathotypes of Rhynchosporium commune (Zaffarona, McDonald & Linde) in some regions of Turkey

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