Pathologic Reaction of Garden Pea (Prisum Sativum L.) Cultivars/ Advanced Breeding Lines to Root-Knot Nematode, Meloidogyne incognita (Kofoid and White) Chitwood

Abstract

Pot experiments were carried out under greenhouse conditions to evaluate the reactionsof eight garden pea cultivars/ advanced breeding lines to Meloidogyne incognita. Seeds were sown in pots containing heat-sterilized soil.After three weeks when the root system has been fully established, the seedlings were inoculated with 1,500 freshly hatched M. incognita juveniles (J2s) per pot. Each garden pea cultivar/ advanced breeding line was replicated four times and arranged in Completely Randomized Design. The effect of nematode inoculation on plant height, fresh and dry weights of shoots and roots and number and weight of pods were assessed sixty days after planting. Likewise, the roots were also examined for the presence of galls and egg masses including the number of developmental stages of the nematode.

Based on the root knot gall and egg mass indices, no cultivar/ advanced breeding linewas found to exhibit resistance to M. incognita. Advanced breeding lines Chinese Green Pea (CGP) 59, CGP 11, CGP 13, and Chinese Light Green (CLG) were highly susceptible while CGP 110, CGP 34, CGP 154, and Betag were susceptible to the root knot nematode.