Effect of leaf rust (Puccinia recondita tritici) on yield of four isogenic wheat lines

The main objective within new approach in international pathogenicity surveys of Puccinia recondita tritici was to provide genetically diverse sources of resistance (wheat lines with pyramiding resistant genes) to be used in a survey of wheat leaf rust pathogen in European-Mediterranean regions and to search for and document pathogenicity of P. recondita tritici cultures useful in differentiating sources of resistance. Emphasis is placed on sources of resistance and their usefulness rather than on description of fungus populations. In this international survey new methods have been applied containing Central Field Nursery, Central Seedling Tests, Cooperative Seedling Tests and Regional Field Nurseries (ELRWN-European Leaf Rust of Wheat Nursery). The results have been reported from one year of investigations. ELRWN contained 20 winter wheat hybrid lines with pyramiding resistant genes including strong ones Lr9, Lr19 and Lr24. In addition, 16 spring wheat lines were included, as control lines were Lr9, Lr18, Lr19, Lr24 and Lr14. In that year ELRWN have been realized in 13 countries and cooperative seedling test in 8 countries using 22 pathotypes of P. recondita tritici. The best results obtained by the winter wheat lines NS-66/5'Lr24, NS-77/2'Lr19, NS- 37/2'Lr19 and spring wheat lines 647-CMA-14793 and 26TH-ESWYT-10. The results have shown loosing almost complete resistance of Lr9 and Lr24, but much less Lr19.

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Control of wheat leaf rust with 4-n-butyl-1,2,4-triazole

Australian Journal of Experimental Agriculture ◽

10.1071/ea9750276 ◽

1975 ◽

Vol 15 (73) ◽

pp. 276 ◽

Cited By ~ 3

Author(s):

RG Rees ◽

GJ Platz

Keyword(s):

Leaf Rust ◽

Field Experiments ◽

Puccinia Recondita ◽

Wheat Leaf Rust ◽

Yield Increase ◽

Boot Stage ◽

Crop Development ◽

Wheat Leaf ◽

Puccinia Recondita Tritici ◽

Excellent Control

The control of wheat leaf rust (Puccinia recondita tritici) by seed or foliar applications of 4-n-butyl-l,2,4-triazole (RH-124) has been examined in field experiments over three years at Gatton, Queensland. Single foliar sprays of RH-124 at rates as low as 100 g a.i, ha-1 have given excellent control of leaf rust. One such spray resulted in a yield increase of 30 per cent. A spray at 400 g a.i. ha-1 increased yield by 46 per cent compared with an increase of 61 per cent in the rust-free reference. Applications around the early boot stage of crop development were the most effective. Treatment of seed with RH-124 resulted in some control of leaf rust in one season with an associated yield increase of 22 per cent. Although RH-124 appears promising, additional studies are required before use of the fungicide on commercial wheat crops would be accepted.

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Complementary genes for reaction to Puccinia recondita tritici in Triticum aestivum. II. Cytogenetic studies

Canadian Journal of Genetics and Cytology ◽

10.1139/g84-116 ◽

1984 ◽

Vol 26 (6) ◽

pp. 736-742 ◽

Cited By ~ 25

Author(s):

R. P. Singh ◽

R. A. McIntosh

Keyword(s):

Triticum Aestivum ◽

Leaf Rust ◽

Puccinia Recondita ◽

Monosomic Analysis ◽

Complementary Genes ◽

Cytogenetic Studies ◽

Puccinia Recondita Tritici

Two complementary genes, A and B, conferring resistance to Puccinia recondita tritici in various wheats were located in chromosomes 4Aβ and 3BS, respectively. In one study gene B showed recombination of 33.6 ± 4.1% with the centromere, and was independent in a second study. Gene B was the same as that designated Lr27. A new designation, Lr31, is proposed for gene A. Both Lr27 and Lr31 must be present for the expression of resistance.Key words: leaf rust, monosomic analysis, aneuploids, wheat.

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Virulence Polymorphism of Puccinia recondita f. sp. tritici and Effectiveness of Lr Genes for Leaf Rust Resistance of Wheat in Ukraine

Plant Disease ◽

10.1094/pd-90-0853 ◽

2006 ◽

Vol 90 (7) ◽

pp. 853-857 ◽

Cited By ~ 10

Author(s):

S. Elyasi-Gomari ◽

V. K. Panteleev

Keyword(s):

Leaf Rust ◽

Rust Resistance ◽

Mixed Race ◽

Leaf Rust Resistance ◽

Puccinia Recondita ◽

Forest Steppe ◽

Lr Genes ◽

Differential Cultivars ◽

Wheat Lines ◽

Field Plots

In 2002 and 2003, 1,300 isolates of Puccinia recondita f. sp. tritici were obtained from six commercial cultivars of wheat at three locations in the eastern forest-steppe region of Ukraine. All isolates were tested for virulence on an international set of eight differential cultivars. Seventeen known wheat leaf rust races and several new, unnamed races were identified. The most common races in each year were races 61, 149, and 192. In 2003, up to 20 isolates each of the seven most common leaf rust races plus 8 to 10 isolates of unnamed races were tested for virulence to 35 near-isogenic wheat lines with different single Lr genes for leaf rust resistance. Isolates were polymorphic for virulence on Lr1, Lr2a, Lr2b, Lr2c, Lr9, Lr19, Lr23, Lr26, and the combination Lr27 + Lr31. No isolates were found virulent on Lr24, Lr25, or Lr28, and few isolates were virulent on Lr9. Few isolates of known races but most isolates of the new, unnamed races were virulent on Lr19. The 35 Lr gene lines also were exposed to mixed-race inoculum in field plots to tests effectiveness of their resistance. Lines with Lr24, Lr25, and Lr28 suffered no leaf rust damage in the field, and lines with Lr9, Lr18, Lr35, Lr36, and the combination Lr27 + Lr31 showed less than 10% severity.

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AGRONOMIC AND QUALITY CHARACTERISTICS OF WHEAT LINES WITH LEAF RUST RESISTANCE DERIVED FROM TRITICUM SPELTOIDES

Canadian Journal of Genetics and Cytology ◽

10.1139/g81-052 ◽

1981 ◽

Vol 23 (3) ◽

pp. 475-480 ◽

Cited By ~ 20

Author(s):

D. R. Knott ◽

J. Dvořák

Keyword(s):

Leaf Rust ◽

Rust Resistance ◽

Leaf Rust Resistance ◽

Triticum Aestivum L ◽

Quality Characteristics ◽

Puccinia Recondita ◽

Recurrent Parent ◽

Wheat Lines ◽

Speltoides Chromosome ◽

Deleterious Genes

Eleven lines of wheat (Triticum aestivum L.) carrying resistance to leaf rust (Puccinia recondita Rob. ex. Desm.) derived from five accessions of Triticum speltoides Tausch were grown in yield tests in 1977 and 1979. The grain was tested for quality characteristics in both years. Although the lines had been backcrossed four or five times to either Manitou or Neepawa, only four of the eleven showed any real promise of equalling their recurrent parent in agronomic and quality characteristics. Lines derived from the same accession of T. speltoides were surprisingly variable. The generally deleterious effects of the transferred chromatin are due either to genes linked to the genes for leaf rust resistance plus incomplete compensation by the speltoides chromosome segment for the aestivum segment it replaced, or to the effects of additional translocations that were not eliminated during backcrossing. A second cycle of homoeologous recombination is proposed as a way to eliminate some of the deleterious genes.

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Locating the Agropyron segment in wheat–Agropyron transfer no. 12

Genome ◽

10.1139/g87-061 ◽

1987 ◽

Vol 29 (2) ◽

pp. 365-366 ◽

Cited By ~ 9

Author(s):

G. C. Eizenga

Keyword(s):

Triticum Aestivum ◽

Key Words ◽

Leaf Rust ◽

Chromosome Pairing ◽

Wheat Chromosome ◽

Triticum Aestivum L ◽

Puccinia Recondita ◽

Agropyron Elongatum ◽

Transfer Lines ◽

Puccinia Recondita Tritici

Twelve lines of wheat (Triticum aestivum L.) were originally identified as having a segment of Agropyron elongatum chromatin carrying a gene for resistance to leaf rust (Puccinia recondita tritici) transferred to wheat chromosome 7D. By studying the chromosome pairing of one of these lines, transfer no. 12, with telosomes 7AL, 7AS, 7BL, 7BS, 7DL, 7DS, and 7AgS, it was determined that the Agropyron chromatin was carried on the long arm of wheat chromosome 7A rather than 7D. This determination was confirmed by acetocarmine–N-banding. Key words: Triticum aestivum, Agropyron elongatum, transfer lines, Puccinia recondita tritici, telosomic analysis.

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Slow rusting and tolerance to rusts in wheat. II. The progress and effects of epidemics in Puccinia recondita tritici in selected wheat cultivars

Australian Journal of Agricultural Research ◽

10.1071/ar9790421 ◽

1979 ◽

Vol 30 (3) ◽

pp. 421 ◽

Cited By ~ 10

Author(s):

RG Rees ◽

JP Thompson ◽

EA Goward

Keyword(s):

Leaf Rust ◽

Pattern Analysis ◽

Puccinia Recondita ◽

Wheat Cultivars ◽

Slow Rusting ◽

Puccinia Recondita Tritici

The progress and effects of epidemics of leaf rust (Puccinia recondita Rob, ex Desm. f, sp. tritici Erikss. & Henn.) have been examined in 45 wheat cultivars over two seasons. The epidemics in each cultivar were compared by various measures and by pattern analysis. The cultivars were separated into groups ranging from highly resistant to highly susceptible with intermediate groups possessing various levels of slow-rusting ability. Cvv. Hopps, Warchief, Huguenot, Pusa 80-5c, Dural, Warput, Koolisie and Puglu were found to possess useful levels of slow-rusting ability. Fast rusting was conspicuous in Gabo and its derivatives Mendos, Mengavi, Gamenya and Gamut. The desirability of not perpetuating this defect is discussed.

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Accumulations of genes for durable resistance to wheat leaf rust pathogen

Journal of Agricultural Sciences Belgrade ◽

10.2298/jas0803163b ◽

2008 ◽

Vol 53 (3) ◽

pp. 163-172 ◽

Cited By ~ 3

Author(s):

Jelena Boskovic ◽

M. Boskovic ◽

Zeljana Prijic

Keyword(s):

Leaf Rust ◽

Resistance Genes ◽

Puccinia Recondita ◽

Recurrent Parent ◽

Considerable Influence ◽

Wheat Leaf Rust ◽

Resistant Genes ◽

Rust Pathogen ◽

Wheat Leaf ◽

Puccinia Recondita Tritici

The individual use of single race-specific resistance genes with major phenotypic effects has rarely provided lasting resistance. However, breeding and combining or pyramiding of resistance genes into individual cultivars has had considerable success, particularly in situation where the pathogen does not reproduce sexually, as in the case of wheat leaf rust pathogen. Within international leaf rust of wheat investigations it was necessary, to create by breeding new resistant wheat lines to Puccinia recondita tritici for differentiation of pathogen population, as well as for sources of resistance in European-Mediterranean regions. In the beginning 18 donors of resistance had been selected after an extensive screening test of several International Rust Nurseries, to be crosses with recur- rent parents varieties Princ and Starke. These tests proved that in those lines were present new resistant genes. Eighth genetically different hybrids of the first back-cross had been selected and tested in the seedling stage with three international pathogen cultures (YU-13-19-1; H-13-9-1 and C2-13-Ar-3). Considerable influence of recurrent parent to the number of resistant genes in donors used was demonstrated. On the other side, it was established considerable influence of the pathogen culture to the number of resistant genes in donors used. The same crossing combinations tested with one pathogen culture results in presence of two resistance genes, but with another culture three or one resistant gene. In order to enhancement resistance and pyramiding genes in these hybrids, eight selected the most interesting lines have been crossed with only effective isogenic containing the strong genes Lr9, Lr19 and Lr24.The genetic analysis of twenty two crossing combinations have been realized by testing with three pathotypes of Puccinia recondita tritici ( Bg.s. 12/89; Is.w 8/89 and Chl.w. 14/89). On the base of different segregation ratios of all crossing combinations it was proved that no one of the resistant donors contained the strong resistant genes used. It means that our hybrid lines contained resistant genes from the donors and in addition three strong resistant genes Lr9, Lr19 and Lr24.

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Selection of Puccinia recondita f.sp. tritici virulence phenotypes in three multilines of Thatcher wheat lines near isogenic for leaf rust resistance genes

Canadian Journal of Botany ◽

10.1139/b95-117 ◽

1995 ◽

Vol 73 (7) ◽

pp. 1081-1088 ◽

Cited By ~ 9

Author(s):

J. A. Kolmer

Keyword(s):

Leaf Rust ◽

Resistance Genes ◽

Rust Resistance ◽

Leaf Rust Resistance ◽

Puccinia Recondita ◽

Near Isogenic Lines ◽

Isogenic Lines ◽

Wheat Lines ◽

Rust Resistance Genes ◽

Leaf Rust Resistance Genes

A heterogeneous population of Puccinia recondita f.sp. tritici developed from randomly mated pycnial infections on Thalictrum speciosissimum was selected for 12 generations on three multilines composed of Thatcher wheat lines near-isogenic for leaf rust resistance genes. Multiline 1 was composed of 20% each of lines near-isogenic for resistance genes Lr2a, Lr3ka, Lr11, Lr17, and Lr24. Multiline 2 was composed of equal proportions each of Thatcher and the five near-isogenic lines in multiline 1. Multiline 3 was composed of 50% Thatcher and 10% each of the five near-isogenic lines. Diversity of virulence phenotypes as measured by the Shannon index declined most in the population selected on multiline 1. Phenotypes of P. r. tritici with virulence to three of the five resistance genes in the multilines were the predominant isolates in all three populations after 12 generations of selection. Frequency of phenotypes with virulence to resistance genes Lr2a and Lr11 significantly increased in all three populations. Virulence to Lr11 significantly increased in the multiline 3 population, and virulence to Lr24 increased in populations from multilines 2 and 3. Frequency of phenotypes with virulence to Lr3ka did not significantly change in any of the populations. Virulence phenotypes with an intermediate number of virulences appeared to have fitness advantage relative to other isolates on the three host multilines. These results indicate that use of wheat multilines may not necessarily stabilize selection for virulence complexity in P. r. tritici populations. Key words: mixtures, Triticum aestivum, wheat leaf rust.

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THE INHERITANCE OF RESISTANCE IN RYE TO Puccinia recondita f. sp. secalis and f. sp. tritici

Canadian Journal of Plant Science ◽

10.4141/cjps84-074 ◽

1984 ◽

Vol 64 (3) ◽

pp. 511-519 ◽

Cited By ~ 6

Author(s):

G. L. C. MUSA ◽

P. L. DYCK ◽

D. J. SAMBORSKI

Keyword(s):

Disease Resistance ◽

Leaf Rust ◽

Secale Cereale ◽

Single Gene ◽

Inbred Lines ◽

Puccinia Recondita ◽

Wheat Leaf Rust ◽

Susceptible Parent ◽

Seedling Resistance ◽

Wheat Leaf

The inheritance of seedling resistance to isolate RLR 213/78 of rye leaf rust (Puccinia recondita f. sp. secalis) and race 30 of wheat leaf rust (P. recondita f. sp. tritici Rob.) was investigated in six inbred lines of rye (Secale cereale). Inbred line UM8116 was used as the susceptible parent in crosses. Inbred lines UM8003, UM8071 and UM8301 each have a single gene and UM8336 and UM8340 each have two genes for resistance to rye leaf rust. For resistance to wheat leaf rust UM8071 has a single gene, UM8003 and UM8340 each have two genes and UM8301 and UM8336 each have three genes. UM8295 is heterogeneous for reaction to both rusts. One of the genes in UM8340 may condition resistance to both rusts. The genes for resistance to RLR 213/78 appear to be independently inherited while some of the genes conferring resistance to race 30 may be identical or very closely linked. The potential of rye as a source of disease resistance for wheat and triticale improvement is discussed.Key words: Secale cereale, disease resistance, wheat leaf rust

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