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April 3, 2009
Source:
CropBiotech Update
Cultivated peanut or groundnut
(Arachis hypogaea L.) is the fourth most important oilseed crop
in the world, grown mainly in tropical, subtropical and warm
temperate climates. The crop production in marginal environment
of Africa and Asia is seriously challenged by several biotic and
abiotic stress constraints. Molecular markers and genetic maps
are the prerequisites for undertaking molecular breeding to
combat such abiotic/biotic stress constraints. In case of
groundnut, though several hundred molecular markers (such as
microsatellite or simple sequence repeat/SSR markers) have been
developed and genetic maps have been developed based on mapping
populations derived from diploid Arachis species or synthetic
tetraploids, not a single genetic was available until recently
for cultivated groundnut.
A team of scientists from the International Crops Research
Institute for the Semi-Arid Tropics (ICRISAT) in collaboration
with colleagues from EMBRAPA/ Catholic University in Brazil,
University of Georgia and Tuskegee University in USA has
developed the first SSR based genetic linkage map for cultivated
groundnut. This map has a total of 135 SSR loci mapped onto 22
linkage groups. The team has demonstrated the utility of this
genetic map for trait mapping in cultivated groundnut and
comparative mapping in legumes.
Details about this map are available in the recent paper
published as an Open Access in Theoretical and Applied Genetics
at
http://www.springerlink.com/content/10125wx862658886/fulltext.pdf
or from Rajeev Varshney. |
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