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Identification of promising resistance sources against sheath blight from the annual wild species of rice Oryza nivara (Sharma et Shastry)

Published online by Cambridge University Press:  02 October 2019

S. K. Aggarwal
Affiliation:
Department of Plant Pathology, Punjab Agricultural University, Ludhiana-141 004, India
K. Neelam*
Affiliation:
School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana-141 004, India
Jyoti Jain
Affiliation:
Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana-141 004, India
Rupinder Kaur
Affiliation:
Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana-141 004, India
P. P. S. Pannu
Affiliation:
Department of Plant Pathology, Punjab Agricultural University, Ludhiana-141 004, India
S. K. Lenka
Affiliation:
ICAR-National Rice Research Institute, Cuttack -753 006, India
J. S. Lore
Affiliation:
Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana-141 004, India
Kuldeep Singh
Affiliation:
ICAR-National Bureau of Plant Genetic Resources, New Delhi-110073, India
*
*Corresponding author. E-mail: kneelam@pau.edu
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Abstract

Sheath blight caused by soil borne necrotrophic fungus Rhizoctonia solani [teleomorph-Thanatephorus cucumeris (Frank) Donk.] is a major disease of rice. The disease is increasing over the year in India and cause up to 69% yield loss under favourable conditions. A total of 67 accessions of Oryza nivara were screened to identify resistance against sheath blight during 2015. Out of these, 16 accessions were found moderately resistant (MR) which were further evaluated during the year 2016 and 2017. After three years of screening, 12 of them were found to have a consistent moderate resistant reaction whereas four of the O. nivara accessions namely, IRGC81941, IRGC102463C, CR100097 and CR100110A have shown moderately susceptible to susceptible reaction against sheath blight. A correlation study revealed that different disease variables measured were significantly (P < 0.05) correlated. All the genotypes and genotype × environment interaction had a significant (P < 0.001) effect on all the disease variables. Cluster analysis showed that all the accessions were clustered into four groups which showed resistant, MR, moderately susceptible and susceptible reactions. Among all the O. nivara accessions IRGC81941A showed the maximum potential against sheath blight due to a least relative lesion height of 22.80%. None of the accession had complete resistance to the disease. The identified promising accessions such as IRGC81835, IRGC81941A, CR100008 and CR100111B can be utilized in a sheath blight resistance breeding program.

Information

Type
Short Communication
Copyright
Copyright © NIAB 2019
Figure 0

Fig. 1. Cluster representation among O. nivara accessions during 2016 and 2017.

Figure 1

Table 1. Screening of promising accessions of Oryza nivara for sheath blight resistance during the years 2016 and 2017

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