GGE biplot analysis of performance in farmers' fields, disease reaction and grain quality of bacterial leaf blight-resistant rice genotypes
2008
Tabien, R.E., Philippine Rice Research Inst., Maligaya, Science City of Muñoz, Nueva Ecija 3119 (Philippines) | Samonte, O.S.PB., Philippines Univ. Los Baños, College, Laguna (Philippines). Dept. of Horticulture | Abalos, M.C. | San Gabriel, R.C., Philippine Rice Research Inst., Maligaya, Science City of Muñoz, Nueva Ecija 3119 (Philippines)
The current technology of using DNA markers facilitated the pyramiding of bacterial leaf blight(BLB) resistance genes, selection and development of five elite lines after three backcrosses. These DNA marker-aided selection(MAS)-derived lines were evaluated for yield and grain qualities in farmers' fields in 15 environments in 2000-2002, after inoculation with nine races of BLB pathogen in the screen house. GGE biplot analyses were conducted to identify the stable genotype for deployment as well as the suitable areas for its commercial grain production. Analysis on grain quality and disease reaction also aimed to determine donor parents for the trait and identify BLB races that will be useful in further screening for resistance. Results showed AR32-19-3-3 has the best yielding line for deployment in Nueva Ecija, Baler and Eastern Samar provinces. It has the best package of resistance to all BLB races and the grain traits commonly found in IR64, the most popular quality rice in the Philippine. It is a good donor for grain quality traits such as amylase content and grain shape. GGE biplot analyses pinpointed the best in this line, thus supporting the varietal release of AR32-19-3-3 in 2006, currently called NSIC Rc 142-'Tubigan 7'. Among the lines, AR32-4-58-2 is a good donor for high milling recovery, head rice and crude protein content. Race 6 is the best representative race for inoculation among BLB races, while races 1 and 5 are good for BLB resistance screening.
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