Mapping of a new gene for brown planthopper resistance in cultivated rice introgressed fromOryza eichingeri
Tóm tắt
Wild rice species is an important source of useful genes for cultivated rice improvement. Some accessions ofOryza eichingeri (2n = 24, CC) from Africa confer strong resistance to brown planthopper (BPH), whitebacked planthopper (WBPH) and bacterial blight (BB). In the present study, restriction fragments length polymorphism (RFLP) and simple sequence repeats (SSR) analysis were performed on disomic backcross plants betweenOryza sativa (2n = 24, AA) andO. eichingeri in order to identify the presence ofO. eichingeri segments and further to localize BPH-resistant gene. In the introgression lines, 1–6O. eichingeri segments were detected on rice chromosomes 1, 2, 6, or/and 10. The dominant BPH resistant gene, tentatively named Bph13(t), was mapped to chromosome 2, being 6.1 and 5.5 cM away from two microsatellite markers RM240 and RM250, respectively. The transfer and localization of this gene fromO. eichingeri will contribute to the improvement of BPH resistance in cultivated rice.
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