【摘 要】
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Breeding semi-dwarf varieties to improve lodging resistance has been proven to be enormously successful in increasing grain yield since the advent of the "green
【机 构】
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National Key Laboratory of Plant Molecular Genetics and CAS Center for Excellence in Molecular Plant
论文部分内容阅读
Breeding semi-dwarf varieties to improve lodging resistance has been proven to be enormously successful in increasing grain yield since the advent of the "green revolution." However,the breeding of the majority of semi-dwarf rice varieties in Asia has been dependent mainly on genetic introduction of the mutant alleles of SD1,which encodes a gibberellin (GA) 20-oxidase,OsGA20ox2,for catalyzing GA biosynthesis.Here,we report a new rice lodging-resistance gene,Shortened Basallnteodes (SBI),which encodes a gibberellin 2-oxidase and specifically controls the elongation of culm basal inteodes through deactivating GA activity.SBI is predominantly expressed in culm basal inteodes.Genetic analyses indicate that SBI is a semidominant gene affecting rice height and lodging resistance.SBI allelic variants display different activities and are associated with the height of rice varieties.Breeding with higher activity of the SBI allele generates new rice varieties with improved lodging resistance and increased yield.The discovery of the SBI provides a desirable gene resource for producing semi-dwarf rice phenotypes and offers an effective strategy for breeding rice varieties with enhanced lodging resistance and high yield.
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