GENETIC STRUCTURE OF REGIONAL POPULATIONS OF Mycosphaerella graminicola (Septoria tritici), THE SEPTORIA LEAF BLOTCH AGENT OF WHEAT

Pakholkova, E.V.; Сальникова, Н Н; Kurkova, N. A.

doi:10.15389/agrobiology.2016.5.722eng

Cited by 7 publications

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“…In Russia, Septoria blotch holds a dominant position in a pathogenic complex of fungus diseases of wheat plantings. The disease poses the highest priority danger in Central, Southern, North Caucasian, North-Western, Privolzhsky, and Siberian Federal regions [16][17][18]. In epiphytotic years, the crop losses from the disease can reach 20-40 % [19][20][21][22][23].…”

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WHEAT Triticum L.) CULTIVARS FROM GRIN COLLECTION (USA) SELECTED FOR DURABLE RESISTANCE TO Septoria tritici AND Stagonospora nodorum BLOTCH

Kolomiets¹,

Pankratova²,

Pakholkova³

2017

S-h. biol.

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A b s t r a c tSeptoria tritici blotch (STB) or Stagonospora nodorum blotch (SNB) are among the most harmful and economically significant diseases of wheat in the grain growing regions of the world, especially in the countries with a temperate climate. In epiphytotic years the losses from the disease can reach 30-40 %. In Russia the diseases holds a dominant position in a pathogenic complex of fungus diseases of grain crops. In this paper we first determined the parameters of partial resistance in the cultivars of wheat (genus Triticum) from the collection of the Germplasm Resources Information Network (GRIN, USA) using the stable strains of Septoria tritici and Stagonospora nodorum pathogens. The aim of our study was to select wheat varieties with long-term resistance to blotch based on field and laboratory tests. A long-term study (2009)(2010)(2011)(2012)(2013)(2014)(2015) of the disease development on the wheat cultivars from GRIN Collection were conducted at artificial infection in infection nursery (Central region of Russia, Moscow Province). The samples studied belonged to various genetic groups. A total of 20 samples were diploids (2n = 14), 409 samples were tetraploids (2n = 28), 1688 samples were hexaploids (2n = 42), and also 397 lines derived from crossing of Triticum aestivum with Aegilotriticum were tested. The area under disease progress curve was determined, and the index of resistance (IR) was calculated. The cultivars, that characterized by slow development of the disease in the field, i.e. with high-and middle IR, were selected for laboratory studies. The plants were grown in artificial climate chambers till the 3 rd leaf fully unfolded. Pieces of leaves were inoculated by a drop of spore suspension of S. tritici (4 isolates) or St. nodorum (4 isolates), 10 replications per each variety-topathotype combination. The samples were grouped according to the latent period length and size of infectious spots. As a result, 191 samples of T. aestivum subsp. aestivum and a sample of T. aestivum subsp. spelta with a high index of resistance to the disease were selected among hexaploid wheat; 16 samples were found in tetraploid wheat, including 8 samples of T. turgidum subsp. durum, 2 samples of T. turgidum subsp. turgidum, 3 samples of T. turgidum subsp. dicoccon, 3 samples of T. timopheevii subsp. timopheevii; and 4 samples were selected from diploid wheat T. monococcum subsp. aegilopoides. Eleven lines derived from crossing of T. aestivum and Aegilotriticum sp. showed the sloweddown in the disease development. The selected hexaploid wheat cultivars were mostly from North American ecology-geographical group of T. aestivum subsp. aestivum, including 77 cultivars from the USA and 18 -from Canada (34.5 % in total). Selected tetraploid wheat samples of T. turgidum subsp. durum were from North and Central America, and those of T. turgidum subsp. turgidum, T. timopheevii subsp. timopheevii and T. turgidum subsp. dicoccon from Europe and Asia. The samples from Iraq and Hungary with a high index of blotch resist...

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confidence: 99%

WHEAT Triticum L.) CULTIVARS FROM GRIN COLLECTION (USA) SELECTED FOR DURABLE RESISTANCE TO Septoria tritici AND Stagonospora nodorum BLOTCH

Kolomiets¹,

Pankratova²,

Pakholkova³

2017

S-h. biol.

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“…[6] Research conducted by Pakholkova et al [7] showed that 6 of the 8 of known resistance genes (Stb1-Stb5, Stb7) had only partial functionality in natural populations of M. graminicola in Russia, the Stb6 gene was highly effective against five populations of M. graminicola. The Stb8 gene was efficient in absolute sense against all tested isolates.…”

Section: Original Articlementioning

confidence: 99%

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Babkenova¹

2017

IJGP

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Aim: The aim of the research was to isolate sources of wheat resistance to Septoria tritici and identify genes that provide resistance to this disease based on the methodology common for phytopathological and molecular genetic studies. Materials and Methods: During the study, 303 spring wheat varietiesof different ecological and geographical origin were screened. At this, 36 samples resistant to S. tritici were isolated at the artificial infectious background. Results: In consequence of molecular genetic tagging of resistance genes in 36 varieties of wheat, it was determined that the majority of the analyzed samples carried in their genotype resistance genes ineffective to S. tritici. Just resistance gene Stb2 was characterized by the moderate efficiency. Among the studied varieties with this gene, eight samples were identified: Strain 36/12-1, Laban, GN06600, MN 94382, SD 80-89, Roblin, Yesaul, and Nota. Field resistance against the disease can be provided by varieties with a large number of resistance genes, such as Laban and Krabat. Varieties of gene Stb8 with efficient resistance to the S. tritici pathogen are of the greatest interest for selection for immunity to S. tritici. Conclusion: In consequence of the conducted research, two varieties of Laban and A.C. crystal with an effective resistance gene Stb8 were identified. These varieties should be used in breeding process as resistance donors to S. tritici.

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“…Evaluation of Stb1-Stb8 gene effectiveness in the European part of Russia showed that only two of them (Stb6 and Stb8) provided resistance to all populations of Z. tritici, three (Stb2, Stb3 and Stb4) to individual regional sub-populations, and the remaining genes had already been overcome by the pathogen [26]. These data indicate that the set of Stb genes available for breeding is very limited.…”

Section: Introductionmentioning

confidence: 98%

The Use of Genetic Material of Tall Wheatgrass to Protect Common Wheat from Septoria Blotch in Western Siberia

2023

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The Septoria blotch is one of the most economically harmful diseases of common wheat in Russia and the world. The disease is mainly caused by two pathogen species: Zymoseptoria tritici that damages the leaves, and Parastagonospora nodorum that strikes the leaves and ears. Resistance genes of the alien relatives are traditionally used for genetic defense of cultivars. The aims of the research were to study the resistance of the tall wheatgrass Thinopyrum ponticum (Podp.) Z.-W. Liu and R.-C. Wang and perspective introgressive lines of spring common wheat with its genetic material to Septoria blotch, and to characterize their agronomical properties to be used in breeding programs in Western Siberia. The studies were carried out in 2015–2019 in the field conditions of the southern forest-steppe (Omsk, Russia) on a natural infection background and according to standard methods. The Septoria diseases developed on the wheat in the period of milk-wax ripeness, independently of humid or dry weather conditions. In 2016, a sharp increase in leaf lesion was noted, probably associated with changes in the Z. tritici population. In 2017, the ratio of Z. tritici and P. nodorum was similar, and in 2019 Z. tritici prevailed. During the research, the lines that combined leaf and ear resistance to damage with high yield and grain quality were selected.

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GENETIC STRUCTURE OF REGIONAL POPULATIONS OF Mycosphaerella graminicola (Septoria tritici), THE SEPTORIA LEAF BLOTCH AGENT OF WHEAT

Cited by 7 publications

References 8 publications

WHEAT Triticum L.) CULTIVARS FROM GRIN COLLECTION (USA) SELECTED FOR DURABLE RESISTANCE TO Septoria tritici AND Stagonospora nodorum BLOTCH

WHEAT Triticum L.) CULTIVARS FROM GRIN COLLECTION (USA) SELECTED FOR DURABLE RESISTANCE TO Septoria tritici AND Stagonospora nodorum BLOTCH

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The Use of Genetic Material of Tall Wheatgrass to Protect Common Wheat from Septoria Blotch in Western Siberia

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