Abstract
Bakanae disease is a fungal disease of rice (Oryza sativa L.) caused by the pathogen Gibberella fujikuroi (also known as Fusarium fujikuroi). This study was carried out to identify novel quantitative trait loci (QTLs) from an indica variety Zenith. We performed a QTL mapping using 180 F2:9 recombinant inbred lines (RILs) derived from a cross between the resistant variety, Zenith, and the susceptible variety, Ilpum. A primary QTL study using the genotypes and phenotypes of the RILs indicated that the locus qBK1z conferring bakanae disease resistance from the Zenith was located in a 2.8 Mb region bordered by the two RM (Rice Microsatellite) markers, RM1331 and RM3530 on chromosome 1. The log of odds (LOD) score of qBK1z was 13.43, accounting for 30.9% of the total phenotypic variation. A finer localization of qBK1z was delimited at an approximate 730 kb interval in the physical map between Chr01_1435908 (1.43 Mbp) and RM10116 (2.16 Mbp). Introducing qBK1z or pyramiding with other previously identified QTLs could provide effective genetic control of bakanae disease in rice.
Highlights
Bakanae disease, which means foolish seedling in Japanese, was firstly identified in 1828 in Japan [1], and is widely distributed in temperate zones as well as tropical environments and occurs throughout rice growing regions of the world [2].Four Fusarium species including F. andiyazi, F. fujikuroi, F. proliferatum and F. verticillioides in the G. fujikuroi species complex have been associated with bakanae disease in rice [3]
Bakanae Disease Bioassay in Parents and F2:9 recombinant inbred lines (RILs)
We identified qBK1z locus related to bakanae disease resistance based on genotype and phenotype analyses of homozygous recombinants on the recombinant progeny of
Summary
Four Fusarium species including F. andiyazi, F. fujikuroi, F. proliferatum and F. verticillioides in the G. fujikuroi species complex have been associated with bakanae disease in rice [3]. This disease is typically a seed-borne fungus, but may occur when the pathogen is present in plant material or soil. Low plant survival and high spikelet sterility [5] may account for yield losses of up to 50% in. S.; Sidhu, J.S.; Huang, N.; Vikal, Y.; Li, Z.; Brar, D.S.; Dhaliwal, H.S.; Khush, G.S. Pyramiding three bacterial blight resistance genes (xa, xa13 and Xa21) using marker-assisted selection into indica rice cultivar PR106.
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