Advanced search


Knowledge area




Filter by:

Publication type

Authors

Issue Years

Publishers

Origin repository

Access Level

Language

Subject

Select the topics of your interest and receive the hottest publications in your email

10 results, page 1 of 1

Effect of seed gall nematode, Anguina tritici, on grain yield of bread wheat cultivar under field conditions

Abdelfattah DABABAT ?rfan Öztürk (2019)

The effects of Anguina tritici on wheat yields and other agronomic components were investigated at Thrace Agricultural Research Institute, Turkey, during the 2015-2016 growing seasons. In the experiment, three different gall densities were used to determine the yield loss caused by the wheat gall nematodes on Selimiye bread wheat variety. The results showed that inoculation of seed gall nematodes at 10%, 20%, and 40% infected seed resulted in yield losses of 9.7, 21.5, and 27%, respectively, when compared to the non-inoculated control. The 1,000 kernel weight did not decrease by the 3 inoculum levels (P>0.05).

Article

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA ANGUINA TRITICI PEST RESISTANCE TRITICUM AESTIVUM WHEAT NEMATODA YIELD LOSSES

Identificación de marcadores moleculares ligados a la resistencia a Septoria tritici blotch mediante mapeo de QTL.

BENJAMIN ASAEL MARTINEZ CISNEROS (2015)

Tesis (Maestría en Ciencias, especialista en Genética).- Colegio de Postgraduados, 2015.

La enfermedad Septoria tritici blotch ocasionada por Zymoseptoria tritici es una de las principales enfermedades del trigo y puede causar grandes pérdidas en el rendimiento de su producción mundial. El control de la enfermedad ha sido una tarea ardua que incluye distintas técnicas, pero la resistencia genética del huésped es un elemento fundamental para su control eficaz. En la presente investigación se identificaron los marcadores moleculares ligados a la resistencia a Septoria tritici blotch mediante el mapeo de QTL de una población con 193 líneas recombinantes puras. Los padres de la población son una línea con origen en Marruecos llamada NASMA susceptible y una línea con origen en CIMMYT llamada RPB709.71/COC resistente a la enfermedad. Utilizando los marcadores moleculares de Secuencias Simples Repetidas y los Polimorfismos de un Solo Nucleótido se identificaron tres QTL en los cromosomas; 3 BL, 5 AL y 7 AS, ligados a la resistencia a Septoria tritici blotch en la fase adulta estables en cuatro ambientes de campo; en Toluca y en el Rancho Bóximo, Jiquipilco, en el Estado de México en los ciclos de evaluación 2010 y 2011. Estos resultados son de gran importancia debido a que la mayoría de las investigaciones para la resistencia a la enfermedad se realizan en la fase de plántula en invernadero y se conoce poco de la resistencia en la fase adulta en campo. _______________ ABSTRACT: Septoria tritici blotch disease caused by Zymoseptoria tritici is one of the major diseases of wheat and can cause large losses in yield of its global production. The disease control has been an arduous task involving different techniques, but the genetic resistance of the host is a key element for effective control. In this project we identified molecular markers linked to resistance to Septoria tritici blotch by QTL mapping using a population of 193 recombinant inbred lines. The parents of the population were a susceptible line from Morocco called NASMA and a disease resistant line from CIMMYT called RPB709.71/COC. Using the molecular marker technologies, Simple Sequence Repeats and Single Nucleotide Polymorphisms we found three QTL on chromosomes 3BL, 5AL and 7AS linked to resistance to Septoria tritici blotch in the adult-plant stage consistent across four different field environments in Toluca and in Bóximo, Jiquipilco, in the State of Mexico in 2010 and 2011. These results are of great importance because previous research for this disease resistance was mainly performed at the seedling stage in the greenhouse. Little is known about the resistance at adult-plant stage in the field.

Master thesis

Zymoseptoria tritici Resistencia Genética Trigo QTL Genetic Resistance Wheat Genética Maestría CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS AGRONOMÍA SEMILLAS

Race structure and distribution of Pyrenophora tritici-repentis in Tunisia

Pawan Singh (2019)

Tan spot, caused by Pyrenophora tritici-repentis (Ptr), is a widespread foliar disease of wheat, which is becoming important in North Africa particularly in Tunisia. To assess the pathogenic variation of Ptr in Tunisia, characterized 84 single conidium isolates of Ptr were characterized from durum wheat cultivars, sampled during the 2017-2018 cropping season. The virulence of isolates were assessed, under controlled conditions, on a standard differential set of six wheat genotypes. Ptr races 2, 4, 5, 6, 7 and 8 were identified, the first such information available for Tunisia. Race 2, commonly found in North America, South America and Asia, was identified for the first time in North Africa, at a low frequency of 5%. Races 5 and 7 were the most frequent, representing, respectively, 39% and 43% of the isolates tested. Only 8% of the isolates were classified as race 8, while 4% were identified race 6. Race 6 was only detected at the experimental station in the North Western region of Tunisia and in a nearby farm field. Only one Ptr isolate was avirulent on all six differential genotypes, and was therefore designated race 4. The identification of six races of Ptr on durum wheat demonstrates the high diversity of the pathogen population in Tunisia.

Article

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA PHYSIOLOGICAL RACES PYRENOPHORA TRITICI REPENTIS HARD WHEAT PLANT DISEASES

Genética de la resistencia a roya amarilla (Puccinia striiformis f. Sp. Tritici) en variedades de trigo harinero (Triticum aestivum L.) liberadas para el bajio

ROCIO TORRES GARCIA (2009)

Tesis (Maestría en Ciencias, especialista en Fitopatología).- Colegio de Postgraduados, 2009.

Con el fin de determinar la genética de la resistencia a roya amarilla (Puccinia triticina f.

sp. tritici) de las cuatro nuevas variedades para riego, estas se cruzaron con la

variedad susceptible Avocet- YrA, progenitor femenino mientras que Cortázar S94,

Bárcenas S2002, Maya S2007 y Urbina S2007 fueron empleados como progenitores

masculinos. Para las cruzas resistentes por resistentes se realizaron tres cruzas que

implicaron al progenitor Cortázar S94 como progenitor femenino, y Bárcenas S2002,

Maya S2007 y Urbina S2007 como progenitores masculinos, dos cruzas implicaron a

Urbina S2007 como progenitor femenino, y Bárcenas S2002 y Maya S2007 como

progenitores masculinos, la cruza de Maya S2007 como progenitor femenino y

Bárcenas S2002 como progenitor masculino. Las 120 familias F3 y los progenitores

fueron evaluados durante el verano 2009 en el CEVAMEX-INIFAP. Estado de México,

mediante la inoculación de una epifitia artificial de esporas del aislamiento Mex 96:11

actualmente 350MEX0. Después de analizar los resultados de las familias F3 se

determinó que la resistencia de las familias F3 fue compleja, condicionada por más de

un gen y no se basa en genes de efectos mayores, los resultados se ajustan a la

segregación de dos y tres pares de genes en Cortázar S94, Bárcenas S2002 y Urbina

S2007 y de tres a cuatro genes en Maya S2007. La ausencia de segregación en las

cruzas resistentes por resistentes indica que los progenitores probablemente tienen un

gen en común.__________

In order to determine the genetics of resistance to yellow rust (Puccinia striiformis f. sp.

tritici) of the 4 new varieties for irrigation, which were crossed with susceptible cultivar

Avocet-YrA female parent. While Cortazar S94, Barcenas S2002, Maya S2007 and

Urbina S2007 were used as male parents. For the resistant by resistant crosses were

made three crosses that involved the parent as the female parent Cortazar S94 and

Barcenas S2002, Maya S2007 and Urbina S2007 as male parents, two crosses with

the female parent Urbina S2007 as female parent and Barcenas S2002 and Maya

S2007 as male parents, a cross between Maya S2007 as female parent and Barcenas

S2002 as male parent. The 120 families F3 and parents were evaluated during

summer 2009 to CEVAMEX-INIFAP, Mexico State, by artificial inoculation of an

epidemic (epiphyte) of spores of the MEX 96:11 named nowadays 350 MEX0. After

analyzing the results of the F3 families was determined that the resistance of the F3

families was complex, but conditioned by a gene and not based on genes of major

effects, the results are consistent with the segregation of two and three pairs of genes

for Cortazar S94, Barcenas S2002 and Urbina S2007 and three to four genes for Maya

S2007. The absence of segregation in resistant by resistant crosses indicated that the

parents probably have a common gene.

Master thesis

Genética de la resistencia Gen Puccinia triticina f sp. tritici Trigo harinero Segregación Bajío CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA