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

1984 ◽  
Vol 26 (6) ◽  
pp. 736-742 ◽  
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.

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

Genome ◽  
1987 ◽  
Vol 29 (2) ◽  
pp. 365-366 ◽  
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.

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

1975 ◽  
Vol 15 (73) ◽  
pp. 276 ◽  
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.

GENETICS OF LEAF RUST REACTION IN THREE INTRODUCTIONS OF COMMON WHEAT

1977 ◽  
Vol 19 (4) ◽  
pp. 711-716 ◽  
Author(s):  
P. L. Dyck
Keyword(s):  
Triticum Aestivum ◽  
Disease Resistance ◽  
Leaf Rust ◽  
Resistance Gene ◽  
Common Wheat ◽  
Infection Type ◽  
Triticum Aestivum L ◽  
Puccinia Recondita ◽  
Seedling Resistance

The genetics of seedling resistance to leaf rust (Puccinia recondita Rob. ex. Desm.) was investigated in what (Triticum aestivum L.) introductions PI 268454, PI 58548 and PI 268316, originally collected in Afghanistan, China and Iran, respectively. PI 268454 was heterogeneous for resistance. A selection (PI 268454a) has a gene that confers a 1+ reaction while a second selection (PI 268454b) probably has resistance gene Lr2b. PI 58548 has two genes for resistance, one giving a 1+ reaction and the second a 2+. These two genes interact to produce a; 1 reaction. PI 268316 has three interacting genes, one giving a 1+ reaction, the second a 2+ and a third resistance gene similar to LrB. The gene giving the 1+ reaction was common to all three introductions. PI 58548 and PI 268316 carry different genes for infection type 2+. Backcross lines of the single genes were produced. Implications to breeding for disease resistance of genes interacting to produce different phenotype are discussed.

INHERITANCE OF LEAF RUST RESISTANCE IN WHEAT CULTIVARS RAFAELA AND EAP 26127 AND CHROMOSOME LOCATION.OF GENE Lr17

1977 ◽  
Vol 19 (2) ◽  
pp. 355-358 ◽  
Author(s):  
P. L. Dyck ◽  
E. R. Kerber
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Puccinia Recondita ◽  
Wheat Cultivars ◽  
Seedling Resistance

The inheritance of seedling resistance to leaf rust (Puccinia recondita) was studied in wheat (Triticum aestivum L.) cultivars Rafaela and EAP 26127. Rafaela has genes Lr14b and Lr17 while EAP 26127 has Lr17. Lr17 was located on chromosome 2A, possibly the short arm, and was independent of Lr11.

Complementary genes for reaction to Puccinia recondita tritici in Triticum aestivum. I. Genetic and linkage studies

1984 ◽  
Vol 26 (6) ◽  
pp. 723-735 ◽  
Author(s):  
R. P. Singh ◽  
R. A. McIntosh
Keyword(s):  
Leaf Rust ◽  
Chinese Spring ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Linkage Studies ◽  
Complementary Genes ◽  
Wide Range ◽  
Puccinia Recondita Tritici ◽  
Seedling Leaf ◽  
Chromosome 3B

Although confirmed instances of complementary genes for rust resistance are rare, two such genes designated A and B for seedling leaf rust resistance were identified in 'Gatcher' and certain other wheats. The two complementary genes in 'Gatcher' were separated in susceptible lines which, when intercrossed, again produced resistant progenies with the specificity of 'Gatcher.' The substitution of a chromosome 3B pair from seedling susceptible 'Hope' into seedling susceptible 'Chinese Spring' resulted in lines displaying similar leaf rust responses to 'Gatcher.' Resistant segregates occurred in segregating populations from crosses of several Sr2-bearing leaf rust susceptible wheats with 'Chinese Spring.' Hence 'Chinese Spring' carried one (A) of the complementary genes, whereas the second gene (B) was very closely linked with Sr2 (r < 0.5%) and was present in a wide range of wheats possessing Sr2. Two wheats carrying gene B lacked Sr2.Key words: leaf rust, stem rust, specificity, wheat.

Puccinia recondita causing leaf rust on cultivated wheats, wild wheats, and rye

1997 ◽  
Vol 75 (12) ◽  
pp. 2082-2096 ◽  
Author(s):  
Y. Anikster ◽  
W. R. Bushnell ◽  
A. P. Roelfs ◽  
T. Eilam ◽  
J. Manisterski
Keyword(s):  
Triticum Aestivum ◽  
Host Range ◽  
Leaf Rust ◽  
Nuclear Dna ◽  
Triticum Turgidum ◽  
Wild Emmer ◽  
Puccinia Recondita ◽  
Wild Wheats ◽  
Group I ◽  
Group Ii

Aecial and telial host range, interfertility, teliospore dimensions, and amount of nuclear DNA were determined for Puccinia recondita collected either worldwide from species of cultivated wheats (Triticum aestivum and Triticum turgidum ssp. durum and rye (Secale cereale), or from wild emmer (Triticum turgidum ssp. dicoccoides) and four species of wild wheat (Aegilops) in Israel. The results indicate that the collections belong in two major groups: Group I (from cultivated wheats and wild emmer), which has Thalictrum speciosissimum (in the Ranunculaceae) as principal aecial host; and Group II (principally from wild wheats or rye), which has several species in the Boraginaceae, such as Anchusa aggregata, Anchusa italica, Echium glomeratum, and Lycopsis arvensis as aecial hosts. In glasshouse experiments, intercrosses could be made readily among collections within Groups I and II but not between the two groups. Group I consisted of all collections from Triticum aestivum, Triticum turgidum ssp. dicoccoides, and most collections from Triticum turgidum ssp. durum. For Group I collections, four species of Aegilops, Hordeum maritimum, S. cereale, as well as Triticum aestivum and Triticum turgidum ssp. durum and ssp. dicoccoides could all serve as telial host in glasshouse experiments. Group II consisted of four types, all clearly different from Group I. Type A was from Triticum turgidum ssp. durum found in fields near Anchusa italica, which was its only aecial host; Triticum aestivum, Triticum turgidum ssp. durum, and Triticum turgidum ssp. dicoccoides could serve as telial hosts. Type B was from Aegilops ovata and had E. glomeratum, Anchusa undulata, and L. arvensis as aecial hosts. Type C was from Aegilops longissima, Aegilops sharonensis, and Aegilops variabilis and had Anchusa aggregata, Anchusa undulata and L. arvensis as aecial hosts. Type D was from S. cereale and had L. arvensis and Anchusa undulata as aecial hosts. In addition to differences in host range, teliospores were wider and bigger in cross sectional area, and nuclear DNA content of pycniospores was 1.3–1.6 times greater in Group II than in Group I. The results suggest that Groups I and II have evolved separately for an extended period and are now morphologically distinct and genetically isolated from each other. Furthermore, differences in both telial and aecial host species, in teliospore dimensions, and in amount of nuclear DNA indicate that subgroups within Group II are beginning to show genetic divergence. Key words: aecial hosts, Aegilops, Anchusa, Echium, Hordeum, leaf rust, Lycopsis, Puccinia recondita, Puccinia triticina, Secale, Thalictrum, Triticum.

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

1979 ◽  
Vol 30 (3) ◽  
pp. 421 ◽  
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.

Genetics of adult-plant resistance of leaf rust in 'Frontana' and three CIMMYT wheats

Genome ◽  
1992 ◽  
Vol 35 (1) ◽  
pp. 24-31 ◽  
Author(s):  
R. P. Singh ◽  
S. Rajaram
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Plant Resistance ◽  
Adult Plant Resistance ◽  
Leaf Rust Resistance ◽  
Field Resistance ◽  
Puccinia Recondita ◽  
Adult Plant ◽  
Leaf Rust Resistance Gene ◽  
Additive Genes

Wheat (Triticum aestivum L.) cultivar 'Frontana' and three globally leaf rust resistant CIMMYT spring bread wheats, 'Parula', 'Trap', and 'Mango', which displayed seedling susceptibility to Mexican pathotypes TCB/TD and (or) TBD/TM of Puccinia recondita f.sp. tritici and which displayed high levels of adult-plant resistance, were genetically analyzed. The four wheats were intercrossed and crossed with seedling and adult-plant susceptible cultivars 'Inia 66' or 'Yecora 70', and also with 'RL6058', a tester for leaf rust resistance gene Lr34. Adult-plant resistance to leaf rust appeared to be based on four additive genes in 'Frontana' and three additive genes in each of the other resistant wheats. Gene Lr34 was confirmed to be present in all four wheats and appeared to be important in conferring adult-plant resistance in conjunction with other partially effective adult-plant resistance genes. Some of these latter genes appeared to be common in the four wheats, since limited segregation occurred when intercrossed. Genes Lr3, Lr10, Lr13, and Lr26 appeared to be independent of the adult-plant resistance. The resistance is expected to be durable, since the source of Lr34 and the additional genes was traced to 'Frontana', which has retained its field resistance since its release in 1943.Key words: adult-plant resistance, genetics, Puccinia recondita f.sp. tritici, Triticum aestivum.

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