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requires field screening; growth chamber screen-
ing can be done (Melouk et al. 1992) but does
not work with all market types (Wilson 2008). By
association analysis of 39 genotypes with 16 SSR
markers, 1 SSR marker was found to be associ-
ated with resistance (Chenault et al. 2009). This
marker was found to work in runner, spanish,
and valencia market types but not in the virginia
market type (Chamberlin et al. 2010). Using a
transgenic approach, Livingstone et al. (2005)
obtained peanut plants with increased resistance
to S. minor by expressing a barley oxalate oxi-
dase gene.
nology, Government of India to support the work
and collaboration with Dr. Shyam N. Nigam
and Dr. P. Janila at ICRISAT, mentioned in this
chapter.
References
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Conclusion
MAS in peanut has lagged behind other major
crops. This is due in good part to the genetic bot-
tleneck that occurred at tetraploidization, result-
ing in a limited amount of molecular variabil-
ity detectable among accessions of the cultivated
species. However, marker maps have been devel-
oped from wild species, and, to an increasing
extent, the cultivated species using new marker
types. It is expected that, with the increase in
number of SSR markers and development of
SNP-based markers, there will be greater use of
MAS in both interspecific and cultivated acces-
sion crosses.
MAS has already proven itself to be useful
in developing cultivars possessing resistance to
the root-knot nematode, and is being used for
selection for resistance to late leaf spot and rust,
as well as for the high-oleic-acid trait. It is to be
expected that, as the power of molecular tools
increases and the cost decreases, MAS will be
used to an increasing degree in this crop.
Acknowledgments
David Bertioli thanks the Council for Scien-
tific and Technological Development of Brazil
(CNPq) for a Productivity Fellowship. Rajeev
Varshney thanks the CGIAR Generation Chal-
lenge Programme, Mexico and Centre of Excel-
lence (CoE) grant from Department of Biotech-
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