Reaction of Pigeonpea Cultivars and Germplasm Accessions to the Root-knot Nematode, Meloidogyne javanica uri icon

abstract

  • Meloidogynejavanica is an important nematode pest of pigeonpea. Thirty-four pigeonpeacuhivars and 227 germplasm accessions were evaluated for resistance to M. javanica based on numberof galls, egg masses, size of galls, and area of root covered with galls. Galls were not formed on75% of the cuhivars, and no egg masses were observed on the roots of four cuhivars (UPAS 120, PantA3, CO 1, and BDN 2); however, shoot mass of 64% of the cuhivars was reduced by M.javanica. PantA3, ANM 504, and BDN 2 were identified as highly resistant to M. javanica. Plant weight of thesecultivars was not reduced (P = 0.05) in the nematode-infested soil. Cuhivars with low gall and eggmass ratings and significantly reduced vegetative biomass in nematode-infested soil were consideredto have low tolerance to the nematode. Galls and egg masses were found on all the germplasmaccessions; galls were usually more common than egg masses. None of the germplasm accessionswere resistant to M. javanica, but 33 accessions were moderately resistant. Large variations in gallnumber, gall size, and egg mass number were observed. ICP 24 and ICP 99, two moderately resistantaccessions, manifested low plant-to-plant variation

publication date

  • 1994