scholarly journals Ocorrência de helmintosporiose (>i/ii/ii/i< L.) sob diferentes condições microclimáticas

2019 ◽  
Author(s):  
Paulo Cesar Sentelhas
Keyword(s):  
Triticum Aestivum ◽  
Erysiphe Graminis ◽  
Helminthosporium Sativum

scholarly journals Indução de mutação visando a redução de altura de planta e resistência às doenças no cultivar de trigo (Triticum aestivum L.) IAC-17

1995 ◽  
Vol 52 (2) ◽  
pp. 287-293 ◽  
Author(s):  
A. Tulmann Neto ◽  
C.E.O. Camargo ◽  
M.C. Alves ◽  
J.L. Castro ◽  
P.B. Gallo
Keyword(s):  
Triticum Aestivum ◽  
Triticum Aestivum L ◽  
Erysiphe Graminis ◽  
Puccinia Graminis ◽  
Helminthosporium Sativum

A redução na altura da planta e obtenção de resistência às doenças foi experimentada através da indução de mutação por raios-gama na variedade de trigo (Triticum aestivum L.) IAC-17. Sementes foram irradiadas com 35 krad e a partir da geração M2 iniciou-se a seleção. Três das linhagens selecionadas foram comparadas com o cultivar original IAC-17, durante três anos, em sete ensaios avançados realizados em vários locais, em condição de sequeiro e irrigação. Os resultados demonstraram a obtenção de um mutante que apresentou redução na altura da planta, tendência de sofrer menos acamamento e maior resistência a oídio (Erysiphe graminis f. sp. tritici). As demais características agronômicas avaliadas, tais como produção de grãos e seus componentes, reação ao Helminthosporium sativum, causador da mancha das folhas, reação a Puccinia graminis f. sp. tritici (ferrugem do colmo) e P. recôndita (ferrugem da folha), tolerância a alumínio e ciclo permaneceram inalteradas em relação a IAC-17. Os resultados indicaram a utilidade da indução de mutações por raios gama para a correção de defeitos de caracteres de herança simples em variedades elites.

Genetic analysis of the avirulence of wheatgrass powdery mildew fungus on common wheat

Genome ◽  
1989 ◽  
Vol 32 (5) ◽  
pp. 913-917 ◽  
Author(s):  
Y. Tosa
Keyword(s):  
Triticum Aestivum ◽  
Powdery Mildew ◽  
Genetic Analysis ◽  
Common Wheat ◽  
Erysiphe Graminis ◽  
Wheat Cultivars ◽  
Avirulence Genes ◽  
Powdery Mildew Fungus ◽  
Major Genes ◽  
Formae Speciales

F1 hybrid cultures between Erysiphe graminis f.sp. agropyri (wheatgrass mildew fungus) and E. graminis f.sp. tritici (wheat mildew fungus) were produced by using a common host of the two formae spéciales. When three common wheat cultivars, Triticum aestivum cv. Norin 4, T. aestivum cv. Norin 10, and T. compactum cv. No. 44, were inoculated with a population of F1 cultures, avirulent and virulent cultures segregated in a 3:1 ratio. This indicated that two major genes are involved in the avirulence of E. graminis f.sp. agropyri, Ak-1, on each of the three cultivars. Further analyses revealed that the three pairs of avirulence genes have one gene in common. On T. aestivum cv. Shin-chunaga, T. aestivum cv. Norin 26, and a strain of T. macha, the F1 population segregated in the same pattern as on T. aestivum cv. Norin 4, indicating that the same pair of avirulence genes is operating on these four cultivars. On T. aestivum cv. Red Egyptian the distribution of F1 phenotypes was continuous, suggesting that no major genes are involved in the avirulence of Ak-1 on this cultivar.Key words: powdery mildew, Erysiphe graminis, avirulence, wheat, wheatgrass.

Gene-for-gene interactions between the rye mildew fungus and wheat cultivars

Genome ◽  
1994 ◽  
Vol 37 (5) ◽  
pp. 758-762 ◽  
Author(s):  
Y. Tosa
Keyword(s):  
Triticum Aestivum ◽  
Powdery Mildew ◽  
Chinese Spring ◽  
Single Gene ◽  
Erysiphe Graminis ◽  
Gene Interactions ◽  
Wheat Cultivars ◽  
Genetic Mechanisms ◽  
Host Parasite ◽  
Gene For Gene

Genetic mechanisms of the incompatibility between Erysiphe graminis f.sp. secalis and wheat cultivars were analyzed using F1 hybrids between E. graminis f.sp. secalis, Sk-1, and f.sp. tritici, Tk-1. The avirulence of Sk-1 on Triticum aestivum 'Norin 4', 'Chinese Spring', and 'Kokeshi-komugi' was controlled by a single gene. The resistance of the three cultivars to Sk-1 was also controlled by a single gene, Pm15, a gene for resistance to E. graminis f.sp. agropyri. Implications of these results were discussed in terms of host–parasite coevolution.Key words: powdery mildew, Erysiphe graminis, resistance, wheat.

Transfer of 35S from wheat to the powdery mildew fungus with compatible and incompatible parasite/host genotypes

1971 ◽  
Vol 49 (2) ◽  
pp. 303-310 ◽  
Author(s):  
R. S. Slesinski ◽  
A. H. Ellingboe
Keyword(s):  
Triticum Aestivum ◽  
Powdery Mildew ◽  
Primary Infection ◽  
Infection Type ◽  
Radioactive Tracer ◽  
Erysiphe Graminis ◽  
Morphological Development ◽  
Incompatible Interaction ◽  
Powdery Mildew Fungus ◽  
The Relationship

Development of Erysiphe graminis f.sp. tritici on wheat, Triticum aestivum, was studied with compatible and incompatible parasite/host genotypes by measuring the rates of transfer of a radioactive tracer from host to parasite during primary infection. Inoculated wheat plants were fed 35SO4− for various 5-h periods beginning 1 to 21 h after inoculation. Rates of 35S transfer were determined by removing the portion of the fungus on the surface of the leaf with a parlodion film and measuring the amount of radioactivity transferred to the parasite during each 5-h period. Four different parasite/host genotypes which specify incompatibility of the relationship, i.e. P1/Pm1, P2/Pm2, P3a/pm3a, and P4/pm4, differed in the inhibition of 35S transfer according to the time and extent of the incompatible interaction specified by each genotype. With the four genotypes P1/Pm1, P1/pm1, p1/pm1, and p1/Pm1 representing alternative combinations of corresponding genes in the parasite and the host, low rates of transfer were observed with the P1/Pm1 incompatible genotype while similar high rates of transfer were observed with each of the remaining compatible genotypes except p1/Pm1. Rates of 35S transfer were lower for the p1/Pm1 genotype than observed with p1/pm1 even though all three genotypes specify compatibility between parasite and host as evaluated by morphological development of the parasite during primary infection and by infection type at 7 days after inoculation.

Cytological aspects of interactions between formae speciales of Erysiphe graminis and genera of gramineous plants, and their evolutionary implications

1990 ◽  
Vol 68 (6) ◽  
pp. 1249-1253 ◽  
Author(s):  
Y. Tosa ◽  
T. Akiyama ◽  
H. Ogura
Keyword(s):  
Triticum Aestivum ◽  
Cell Wall ◽  
Hordeum Vulgare ◽  
Secale Cereale ◽  
Avena Sativa ◽  
Erysiphe Graminis ◽  
The Other ◽  
Formae Speciales ◽  
Ancestral Form ◽  
Host Parasite

The progress of infection in leaves of wheat (Triticum aestivum), rye (Secale cereale), wheatgrass (Agropyron tsukushiense), barley (Hordeum vulgare), and oat (Avena sativa) inoculated with Erysiphe graminis f.sp. tritici, secalis, agropyri, and hordei was observed using a fluorescence microscope. Relative compatibility of each host–parasite combination was estimated by the incidence of cell wall penetration. Formae speciales tritici, secalis, and agropyri were highly compatible with any accession of wheat, rye, and wheatgrass, but less compatible with barley. On the other hand, f.sp. hordei was highly compatible with any of these four hosts. The four formae speciales had very low compatibility with oat, although f.sp. hordei was relatively more compatible with this host. These results suggested that (i) f.sp. tritici, secalis, and agropyri are phylogenetically very close; (ii) f.sp. hordei is less close to f.sp. tritici, secalis, and agropyri, and closer than these to the ancestral form of E. graminis; (iii) f.sp. avenae is remote from f.sp. tritici, secalis, agropyri, and hordei, but relatively less remote from f.sp. hordei than from the other three formae speciales.

Identification of a gene for resistance to wheatgrass powdery mildew fungus in the common wheat cultivar Chinese Spring

Genome ◽  
1988 ◽  
Vol 30 (4) ◽  
pp. 612-614 ◽  
Author(s):  
Y. Tosa ◽  
H. Tokunaga ◽  
H. Ogura
Keyword(s):  
Triticum Aestivum ◽  
Powdery Mildew ◽  
Common Wheat ◽  
Chinese Spring ◽  
Wheat Cultivar ◽  
Erysiphe Graminis ◽  
Common Wheat Cultivar ◽  
Powdery Mildew Fungus ◽  
Hybrid Culture ◽  
The Common

A gene for resistance to Erysiphe graminis was detected in Triticum aestivum cv. Chinese Spring, strain Salmon, T. compactum cv. No. 44, and T. spelta var. duhamelianum, using a hybrid culture derived from E. graminis f. sp. agropyri × E. graminis f. sp. tritici. The gene was located on the short arm of chromosome 6B and designated Pm11. Pm11 was considered to be involved in the resistance of wheat to the wheatgrass powdery mildew fungus.Key words: wheat, resistance, powdery mildew, Erysiphe graminis.

Sign in / Sign up

Export Citation Format

Share Document