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Lopes M.S.,CIMMYT Int. Apdo. | Reynolds M.P.,CIMMYT Int. Apdo. | McIntyre C.L.,CSIRO | Mathews K.L.,CIMMYT Int. Apdo. | And 7 more authors.
Theoretical and Applied Genetics | Year: 2013

Heat and drought adaptive quantitative trait loci (QTL) in a spring bread wheat population resulting from the Seri/Babax cross designed to minimize confounding agronomic traits have been identified previously in trials conducted in Mexico. The same population was grown across a wide range of environments where heat and drought stress are naturally experienced including environments in Mexico, West Asia, North Africa (WANA), and South Asia regions. A molecular genetic linkage map including 475 marker loci associated to 29 linkage groups was used for QTL analysis of yield, days to heading (DH) and to maturity (DM), grain number (GM2), thousand kernel weight (TKW), plant height (PH), canopy temperature at the vegetative and grain filling stages (CTvg and CTgf), and early ground cover. A QTL for yield on chromosome 4A was confirmed across several environments, in subsets of lines with uniform allelic expression of a major phenology QTL, but not independently from PH. With terminal stress, TKW QTL was linked or pleiotropic to DH and DM. The link between phenology and TKW suggested that early maturity would favor the post-anthesis grain growth periods resulting in increased grain size and yields under terminal stress. GM2 and TKW were partially associated with markers at different positions suggesting different genetic regulation and room for improvement of both traits. Prediction accuracy of yield was improved by 5 % when using marker scores of component traits (GM2 and DH) together with yield in multiple regression. This procedure may provide accumulation of more favorable alleles during selection. © 2012 Springer-Verlag Berlin Heidelberg. Source

Sarkar B.,Directorate of Wheat Research DWR | Verma R.P.S.,Directorate of Wheat Research DWR | Parsad R.,Indian Agricultural Research Institute | Shoran J.,Directorate of Wheat Research DWR
Indian Journal of Genetics and Plant Breeding | Year: 2010

A total of 5337 barley accessions were evaluated for a number of traits. The accessions included indigenous germplasm collected from various parts of India; exotics selected from trials and nurseries received from ICARDA/ CIMMYT, Mexico and ICARDA, Syria; as well as materials received from different countries over the last four decades. Out of the total accessions, 2801 were indigenous and 2536 exotic. Only 290 accessions were naked type, the rest were hulled. This paper summarizes results on classification and characterization of these accessions for various agro-morphological traits, associations among these traits, and frequency distribution and donors for days to heading, plant height and 1000-kernel weight. Source

Sarkar B.,Directorate of Wheat Research DWR | Sharma R.C.,ICARDA | Verma R.P.S.,Directorate of Wheat Research DWR | Sarkar A.,Directorate of Research on Women in Agriculture | Sharma I.,Directorate of Wheat Research DWR
Indian Journal of Genetics and Plant Breeding | Year: 2014

Barley (Hordeum vulgare L.) is an important feed purpose cereal grown under diverse production conditions and harsh environments. The present investigation was carried out to study performance of advanced breeding lines and identify superior genotypes of feed barley using multienvironment trial data from All India Coordinated Wheat and Barley Improvement Programme (AICW&BIP). Ninety three experimental genotypes and five released cultivars were tested across eleven locations during four years. Grain yield and other agronomic traits were analyzed. Stability and genotype superiority for grain yield and other traits were determined using genotype and genotype × environment (GGE) biplot analysis. The result showed that environment and genotype contributed 32.9 to 67.4% and 4.7 to 20.4% of the total variation, respectively. The genotype × environment interaction contributed 27 to 44% of total variation. The experimental genotypes showed arrays of variation for grain yield in each year, with mean values ranging from 2.12 to 5.36 t/ha. Twelve experimental genotypes were identified, which were either superior or equal performance to the best check based on their high yield and stability across environments. The locations Varanasi, Kanpur, Vijapur and Durgapura discriminated the genotypes more than other sites for grain yield and agronomic traits. The findings provided valuable information on wide adaptation of feed barley genotypes, which could be useful for barley improvement programmes. © 2014, Indian Agricultural Research Institute, All rights reserved. Source

Parveen S.,Directorate of Wheat Research DWR | Saharan M.S.,Directorate of Wheat Research DWR | Verma A.,Directorate of Wheat Research DWR | Sharma I.,Directorate of Wheat Research DWR
Archives of Phytopathology and Plant Protection | Year: 2013

Karnal bunt of wheat caused by Tilletia indica is an important international quarantine disease in many countries. In this investigation, genetic and pathological variation among the 10 isolates and 15 monosporidial (Ms) lines belonged to different locations of North-West India was studied. Depending upon the pathogenic potential, most virulent and least aggressive isolate was found from Chaksu (Rajasthan) and Tarau (HP), which scored coefficients of infection 70.98 and 6.22, respectively, on susceptible host genotype HD 2009 under artificially inoculated conditions. Fifteen Ms lines were inoculated in 20 combinations. Most virulent compatible combination was found KB2MsD × KB6MsA, which scored co-efficient of infection 74.91%. Out of 32 Inter Simple Sequence Repeats based molecular markers, 28 were polymorphic generating 192 reproducible bands for all the T. indica isolates and Ms lines in this study. A grouping analysis using the unrooted neighbour - joining method was consistent with DARwin software and winboot analysis and combination approach suggested that self-paired Ms lines exhibit narrow genetic diversity. This result will be useful for developing integrated strategies for disease management and breeding programmes for improvement of the varieties. © 2013 Copyright Taylor and Francis Group, LLC. Source

Verma R.,Directorate of Wheat Research DWR | Malik R.,Directorate of Wheat Research DWR | Kumar R.,Directorate of Wheat Research DWR | Singh S.,Directorate of Wheat Research DWR
Cereal Research Communications | Year: 2011

A study was undertaken to determine the genetics of corn leaf aphid (CLA) resistance in barley under controlled conditions with artificial inoculation at adult plant stage. Inheritance of CLA resistance was investigated in five resistant barley genotypes (EB921, EB2507, Manjula, DL529 and K144) in crosses with susceptible parent Alfa93 in F1, F2, F3 and backcross (BCF1) generations. The aphid inoculation was done using the brush method as well as the detached leaf method. Individual plants were classified in resistant, moderately resistant, susceptible and highly susceptible categories base on number per shoot as well as multiplication of CLA on any of the fresh, young leaf. The plants scored as resistant or moderately resistant were observed twice more at 10 days interval to confirm their reaction. Resistance was governed by a single dominant gene in EB921, DL529 and K144, while it was monogenic recessive in Manjula and EB2507. These diverse sources may be used in breeding for CLA resistance in barley improvement programme. Source

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