Response of rice genotypes to rice root‐knot nematode (Meloidogyne graminicola) infection under varying temperature regimes. (30th September 2022)

• Record Type: Journal Article
• Authors: Devaraja, Koratigere Parameshanayka; Ellur, Ranjith Kumar; Singh, Ashok K.; Abhishek Gowda, Anumanahalli Puttasawamy; Sirohi, Anil
• Is Part Of: Plant pathology. Volume 72:Number 1(2023)
• Page Start: 179
• Page End: 194
• Publication Date: 2022-09-30
• Subjects: hatching -- histopathology -- Meloidogyne graminicola -- penetration -- rice genotypes -- temperature; Agricultural pests -- Periodicals; Plant diseases -- Periodicals; 632
• DOI: 10.1111/ppa.13647
• Languages: English
• ISSNs: 0032-0862

Abstract

Abstract: The rice root‐knot nematode (RRKN), Meloidogyne graminicola, is one of the major pests of the rice–wheat cropping system. Resistance against M . graminicola in rice could be most valuable in alleviating this problem. The host response of 75 Oryza genotypes was examined at three day/night temperature regimes, 29/26°C, 34/31°C and 38/35°C, in Pluronic gel as well as in soil. Out of the 75 selected rice genotypes, only Zhenshan 97 B exhibited high resistance to this set of temperature regimes, with the least number of galls/root system. At 34/31°C, more second‐stage juveniles (J2s) were hatched and J2 population densities in roots of the susceptible rice genotypes increased significantly compared with those of plants grown at the 29/26°C. In resistant genotypes, only a few J2s penetrated roots and developed into mature females. The histopathological studies revealed that in susceptible rice genotypes at high‐temperature regimes, the multinucleate giant cells were well developed. The results presented in this study revealed that an increase in temperature had a significant effect on the resistance of rice genotypes and resistance appeared more pronounced in genotype Zhenshan 97 B. This resistant genotype can be used in marker‐assisted selection to develop resistant elite cultivars. Abstract : Seventy‐five rice genotypes were evaluated for resistance to Meloidogyne graminicola at three temperatures; the resistant lines can be used for the identification of resistance gene(s)/QTLs for the development of elite‐resistant cultivars.