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Molecular marker-assisted selection: a novel approach for host plant resistance to insects in grain legumes

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Relation http://oar.icrisat.org/4282/
 
Title Molecular marker-assisted selection: a novel approach for host plant resistance to insects in grain legumes
 
Creator Sharma, H C
Crouch, J H
 
Subject Chickpea
Pigeonpea
Groundnut
 
Description Grain such as chickpea, pigeonpea, cowpea, fieldpea, lentil, grams, beans, soybean,
and groundnut play an important role in "the daily diets the people worldwide. Being a rich
source of protein, they are damaged by. a large number of insect pests such as legume pod
borer, corn earworm, pod borer, aphids, white fly, tobacco caterpillar, leafhoppers,
thrips and bruchids. of resistance to insects in grain legumes have been identified
long ago, but these have not been used. effectively in crop improvement because of the
difficulties involved in screening and selection of the test material under conditions.
Molecular markers can play an important role in accelerating the introgresslOn of genes
conferring to target insects into high-yielding cultivars, understanding the nature
of gene action, and reducing the deleterious effects introgressing unwanted genes from wild
species through linkage drag. Molecular breeding also offers the opportunity to pyramid
different sources of resistance that could not be effectively selected through conventional
breeding due to identical phenotypes and thereby accumulate levels of resistance and/or
create potentially more durable resistant cultivars. Considerable has been made in
developing genetic linkage maps of chickpea, cowpea, and soybean, while much remains to
be done in pigeonpea, beans, lentil, and fieldpea. Preliminary identification of molecular markers
resistance to insects in soybean, chickpea, mungbean, fieldpea, and cowpea has been
reported. However, no distinct advantage has been observed by using assisted
selection resistance to insect pests over the conventional approach, and in most cases,
the epistatic are also quite high. Thus, a new paradigm approach may be required to
combine conventional approaches and marker-assisted selection in such way as to create
systems better than either approach. This paper reviews current state-of-the-art concerning
conventional and molecular breeding for pest resistance, and highlight the opportunities and
con~traints for use of molecular markers for accelerating the pace of development of insectresistant
culrivars in grain legumes.
 
Date 2004
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4282/1/MolecularMarkerAssistedSelection_2004.pdf
Sharma, H C and Crouch, J H (2004) Molecular marker-assisted selection: a novel approach for host plant resistance to insects in grain legumes. In: Pulses in new perspective: proceedings of the National Symposium on Crop Diversification and Natural Resource Management, 20-22 December 2003, Indian Institute of Pulse Research, Kanpur, India.