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- Title
Wild Rice Species in Sri Lanka as Genetic Resources for Breeding for Brown Plant Hopper (Nilaparvata lugens (Stål)) Resistance in Rice.
- Authors
Abhayagunasekara, A. V. C.; Chandrasena, G. D. S. N.; Dissanayake, D. M. O. K. B.; Jayasundara, J. M. S. M.; Pushpakumara, D. K. N. G.; Samarasinghe, W. L. G.; Bandaranayake, P. C. G.
- Abstract
Brown planthopper (BPH) Nilaparvata lugens (Stål.) is considered the most destructive rice pest in rice-growing countries including Sri Lanka. Resistance breeding considered the most economical management strategy, starts by identifying new genetic resources for BPH resistance and comparative analysis with existing donors. So far, scientists have identified 38 genes/QTLs responsible for BPH resistance. This study explored the BPH resistance in five wild rice species in Sri Lanka, including the endemic species Oryza rhizomatis. One recommended rice variety; Bg 352, fourteen O. rhizomatis accessions, and one accession from Oryza nivara, Oryza rufipogon, Oryza granulata and Oryza eichingeri screened by the honeydew test. The experiment was arranged in a complete randomized design with fifteen replicates with Bg 380 and Ptb 33 as susceptible and resistant checks respectively. The lower amount of honeydew excretion recorded in all tested O. rhizomatis accessions, O. nivara, O. granulata, and O. eichingeri accessions suggested BPH resistance. Both Ptb 33 and O. rufipogon showed a similar level of resistance with low honeydew excretion. The varieties Bg 352 and Bg 380 showed a high amount of honeydew excretions confirming higher susceptibility to the BPH. Therefore, all fourteen accessions of O. rhizomatis and the selected accessions of O. nivara and O. eichingeri are potential donors for rice breeding programs. Further, the coding sequences (CDS) of known BPH genes of O. sativa were used as queries to search similar genes in wild rice genomes. The CDS coverage and phylogenetic analysis suggest, of known BPH resistance genes, at least BPH6, BPH9, BPH14-1, and BPH18 are present in O. rhizomatis, O. eichingeri, O. nivara, and O. rufipogon genomes. This information will assist in marker-assisted breeding attempts.
- Subjects
SRI Lanka; WILD rice; RICE genetics; RICE breeding; SCIENTISTS
- Publication
Tropical Agricultural Research, 2022, Vol 33, Issue 2, p102
- ISSN
1016-1422
- Publication type
Article
- DOI
10.4038/tar.v33i2.8550