Breeding bacterial blight-resistant rice cultivars at the Philippine Rice Research Institute
2003
Tabien, R.E. | Sebastian, L.S.
At PhilRice, known genes for bacterial blight (BB) resistance are being incorporated into elite lines and varieties. Both conventional and molecular marker-assisted procedures are being used to facilitate the development of a new rice variety with BB resistance. For a single major gene, classical backrossing is currently under way while, for gene combinations, marker-assisted selection is being practiced. Elite lines from both methods having a single gene, such as xa5 or Xa21, and a combination of xa5 and Xa21 have been developed and were entered in various yield trials. Yields were comparable with those of the recipient parent, but several lines were high-yielding. Lines developed through marker-aided and classical backcrossing and selection have retained morphological features of the recurrent parent. To pyramid several genes, crosses between and among promising lines have been made to combine the three genes. Donors for tungro and blast resistance will be used later to increase the spectrum of resistance of the lines. The elite lines are currently being evaluated in farmers' fields in a hot-spot area for BB in the country
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