Indian Society of Genetics & Plant Breeding

Histopathological changes and evaluation of resistance in Asian rice (Oryza sativa L.) against rice root-knot nematode, Meloidogyne graminicola Golden & Birch.

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The rice root-knot nematode, Meloidogyne graminicola is
one of the major pest of the rice-wheat cropping system,
and is responsible for considerable yield reductions.
Resistance against M. graminicola in rice could be most
valuable in alleviating this problem. In the present study, 64
rice cvs./landraces were evaluated for resistance against
rice root-knot nematode on the basis of root-knot index.
Our study showed a large variation in susceptibility and
sensitivity to M. graminicola infection among the rice cvs./
landraces examined. Out of the total 64 rice cvs., seven
(Abhishek, Khaja, Super Sugandhamati, Kishori Dehraduni,
Gaudeshwari, Tuniaslet, Chima Kamin) had less than 10
galls/plant and of these, Abhishek exhibited a strong
resistance response with least number of galls (2 galls/
plant) and necrotic browning of roots. The nematode
females in the roots of cv. Abhishek were smaller in size
compared to those on the highly susceptible cv. Bangla
Patni.The histopathological studies showed that the giant
cells collapsed and degenerated before the J2s developed
into adults. The resistant trait exhibiting rice cultivar,
Abhishek, holds promise for resistance breeding and also
for identifying resistance gene/s against M. graminicola.

Keywords: Meloidogyne graminicola, Oryza sativa, landraces, histopathological changes, resistance, susceptibility, giant cell


Year: 2015
Volume: 75
Issue: 1
Article DOI: 10.5958/0975-6906.2015.00004.8
Print ISSN: 0019-5200
Online ISSN: 0975-6906


S. K. Malik , Sukhdeep Kaur info_circle
Ashok Kumar Singh info_circle

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