Indian Society of Genetics & Plant Breeding

Introgression of phytophthora blight disease resistance from Cajanus platycarpus into short duration pigeonpea [Cajanus cajan (L.) Millsp.]

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Phytophthora blight is an important disease of pigeonpea.
Resistance to this disease is not present in the germplasm
Cajanu5 platycarpu5 (accession ICPW 61), a
wild species of pigeonpea, has many desirable characters
including resistance to P3 (highly virulent) isolate of
Phytophthora blight. Unfortunately C.
platycarpu5 cannot
be crossed with cultivated pigeonpea by conventional
techniques. Hybrids were obtained by the use of embryo
rescue techniques. F
1 hybrids were 100% pollen sterile,
hence were treated with colchicine to double their
chromosome number. The resultant plants had double the
chromosome number and were tetraploids. F
1 plants were
subjected to the pathogen. The results of this screening
experiment showed that it was possible to transfer
resistance to Phytophthora blight from the wild species
platycarpu5 to cultivated pigeonpea. The results of F2
data indicated that the nature of resistance to be
monogenic and recessive.

Keywords: Pigeonpea, disease resistance, microtomy, phytophthora blight, allotetraploid


Year: 2005
Volume: 65
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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