280 research outputs found
CIMMYT Maize Lines (CMLs) - pedigree and characterization data
No full textCIMMYT has periodically announced CIMMYT Maize Lines (CMLs). CMLs are carefully selected inbred lines with good general combining ability and a significant number of value-adding traits such as drought tolerance, N use efficiency, acid soil tolerance, resistance to diseases, insects and parasitic weeds. In many instances, they are parental lines of hybrids which have proven successful in one or several maize mega-environments. For each line, there is information about pedigree, heterotic group, disease resistance, breeding program, agronomic characteristics, adaptation group, etc. in this reference table.
As of July 2015, the Maize Program has released 561 CMLs.
These CML lines are available at the CIMMYT Maize Germplasm Bank:
http://www.cimmyt.org/en/what-we-do/germplasm-and-seed/obtainseed
For more information, please contact: [email protected]
CIMMYT Maize Lines (CMLs) - Pedigree and characterization data
No full textCIMMYT has periodically announced CIMMYT Maize Lines (CMLs). CMLs are carefully selected inbred lines with good general combining ability and a significant number of value-adding traits such as drought tolerance, N use efficiency, acid soil tolerance, resistance to diseases, insects and parasitic weeds. In many instances, they are parental lines of hybrids which have proven successful in one or several maize mega-environments. For each line, there is information about pedigree, heterotic group, disease resistance, agronomic characteristics, adaptation group, and other attributes in the reference CML information catalog file. These CML lines are available at the CIMMYT Maize Germplasm Bank: http://www.cimmyt.org/seed-request/#maize. For more information, please contact: [email protected]
The CIMMYT Maize Germplasm Bank: genetic resource preservation, regeneration, maintenance, and use
No full textOriginally developed as background information for participants in a 1992 external review of the CIMMYT Maize Germplasm Bank and related activities, this publication recounts CIMMYT's role in the early work of marshalling maize genetic resources, tells how the materials collected have been utilized, summarizes current activities of the Maize Germplasm Bank, and describes directions in which CIMMYT activities on maize genetic resources are evolving to encourage more effective and widespread use of bank accessions.vii, 88 page
2019 release of SNP allele frequency data for maize accessions in the CIMMYT Germplasm Bank maize collection
No full textThe Maize Collection in the CIMMYT Germplasm Bank was genotyped using DArTSeq technology. Pooled DNA samples were generated from over 25,000 accessions. The counts of resulting SNPs were used to evaluate the allele frequencies of alleles present within the maize accessions.
The genotyping method is described in: http://hdl.handle.net/11529/10548358
CIMMYT Maize Genetic Resource Lines
No full textCIMMYT makes available to the public a set of maize inbred lines called CIMMYT Maize Genetic Resource Lines (CMGRL). The CMGRLs are derived from crosses between elite CIMMYT lines and landrace accessions, populations or synthetics from the CIMMYT Germplasm Bank.
CMGRLs are intended to be used by breeders as sources of novel alleles for traits of economic importance. These lines should also be of interest to maize researchers who are not breeders but are studying the underlying genetic mechanisms of abiotic and biotic traits.
The inaugural group of CMGRLs includes five subtropical-adapted lines with tolerance to drought during flowering and grain-fill and four tropical adapted lines for Tar Spot Complex resistance
Evaluation of Tar Spot resistance in 2011 in Guadalupe-Victoria, Chiapas
No full textCitation: Willcox, Martha; Burgueño, Juan ; Mahuku, George ; Guadarrama Espinoza, Armando ; Chepetla Calderon, Daniel ; Lopez, Manuel ; Gonzalez, Jesus ; Leyva, Mayolo ; San Vicente, Felix ; Maize Germplasm Bank; Dupont Pioneer, 2014, "Evaluation of Tar Spot resistance in 2011 in Guadalupe-Victoria, Chiapas", http://hdl.handle.net/11529/10031 International Maize and Wheat Improvement Center [Distributor] V1 [Version
IDENTIFYING APPROPRIATE GERMPLASM FOR PARTICIPATORY BREEDING: AN EXAMPLE FROM THE CENTRAL VALLEYS OF OAXACA, MEXICO
No full textIdentifying the appropriate germplasm to be improved is a key component of any participatory breeding effort because of its implications for impacts on social welfare and genetic diversity. This paper describes a method developed to select a subset of 17 populations for a participatory breeding project from a set of 152 maize landraces. The larger set of landraces was collected in order to characterize, for conservation purposes, the maize diversity present in the Central Valleys of Oaxaca, Mexico. The method combines data representing the perspectives of both men and women members of farm households and those of genetic resources specialists, including professional plant breeders, gene bank managers, and social scientists. The different perspectives complement each other. The results show that when the choice of germplasm is based only on the perspective of genetic resources specialists, traits and materials that are important to farm households may be ignored. Such selections may be less valuable to farmers, limiting the impact of the participatory breeding effort on their livelihoods. However, the findings also indicate that relying solely on the perspectives of farm households may lead to lower diversity. Choosing populations based solely on either perspective involves a social cost-either in terms of diversity or in terms of farmer welfare. Although our approach has limitations, many of which are common to participatory research, it represents a systematic method for meeting one of the important challenges of participatory plant breeding.Mexico, Oaxaca, Maize, Zea mays, Land race, Germplasm conservation, Plant breeding, Selecting, Innovation adoption, Social welfare, Welfare economics, On farm research, Participatory research, Farm Management,
Evaluation of maize germplasm based on zein polymorphism from the archipelago of Madeira
No full textZein polypeptides are a group of proteins
that accumulate in maize endosperm during seed development, representing more than 60% of the total endosperm proteins in the mature seeds. To evaluate genotype variability of Madeiran maize germplasm, a biochemical study was conducted based on the prolamins of
maize, zeins, extracted from endosperm meal of 43 populations of Zea mays L. maintained in the Germplasm bank
of Madeira University along with the inbreed W64A which
was used as a polymorphic zein polypeptide standard
profile. The zein polymorphism of these 44 maize populations were compared using two different electrophoresis
techniques, SDS-PAGE in 15% discontinuous polyacrylamide gel and Acid-PAGE in 10% continuous polyacrylamide gel. SDS-PAGE allowed up to 16 polypeptides to
be identified with apparent molecular mass ranging from
28-kDa to 10-kDa. Acid-PAGE allowed up to 20 zein fractions to be identified. The data was submitted to principal
component analysis (PCA) and canonical discriminate and
similarity analysis. The SDS-PAGE zein polymorphism allowed us to detect 6 groups, assembling all maize populations and explaining 55.32% of all variability. The similarity analysis of zein patterns obtained by Acid-PAGE
showed that among regional maize germplasm, 22.5 % of
all population seems to be related and have a common
ancestor. The ISOP71 seems to be the population more
closed to the common ancestor and appears related with
the remaining maize populations, excluding the ISOP125.The obtained results and the importance of zein polymorphism in the evaluation of maize germplasm from
Madeiran Archipelago are discussedinfo:eu-repo/semantics/publishedVersio
SNP Allele Frequencies and Descriptive Data of 15,384 CIMMYT Germplasm Bank Maize Landrace Accessions
No full textData and data descriptions supporting the journal article "The impact of sample selection strategies on genetic diversity and representativeness in germplasm bank collections
Cost of Conservation of Agrobiodiversity
No full textThe cost of conservation of germplasm stored in gene banks i.e., ex-situ collections has been studied in other parts of the world to estimate direct and indirect contributions by various actors involved in conservation. This is the first study of its kind in India done in collaboration with National Bureau of Plant Genetic Resources, New Delhi. This was part of a sponsored research by Centre for Development Research, Germany. The limitations of this study are also listed so that future research in this regard can be pursued better. One of the costs not included is the cost of sharing data with local communities for enabling them to access germplasm in times of need. This is an important component of conservation and would require translation of gene bank and associated database in local language, making them available through public kiosks. This cost has not been included in any study on the subject so far. Separately, studies are underway to look at the conservation of germplasm under in-situ conditions.
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