AgricultureCrop SciencesPlant SciencesBreeding For Disease ResistanceCrop ImprovementPlant GeneticsDisease ResistanceDisease Resistance EvaluationPlant Disease ResistanceResistance Breeding For Bacterial DiseasesResistant Crop VarietiesBacterial Blight ResistanceBacterial Leaf BlightBacterial Leaf SpotDisease Resistance TraitsMarker-assisted Selection For ResistanceMolecular Marker-assisted BreedingPlant Resistance BreedingRice Grain Quality
Through recurrent backcrossing in combination with molecular marker-assisted selection (MAS), restorer lines R8006 and R1176 carrying Xa-21 , a gene having broad-spectrum resistance to rice bacterial leaf blight, were selected. By crossing the two lines to CMS line Zhong 9A, two new hybrid rice combinations, Zhongyou 6 and Zhongyou 1176 were developed. The hybrids showed high resistance to diseases, good grain quality and high yielding potential in national and provincial adaptability and yield trials.