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 ...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 Basal lnternodes （SBI）, which encodes a gibberellin 2- oxidase and specifically controls the elongation of culm basal internodes through deactivating GA activity. SBI is predominantly expressed in culm basal internodes. 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 SB! 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.展开更多
As a consequence of contamination of soil with heavy metals,cadmium accumulation in grain is of great concern worldwide,but especially in southern China.It is important to evaluate the Cd accumulation potential of gra...As a consequence of contamination of soil with heavy metals,cadmium accumulation in grain is of great concern worldwide,but especially in southern China.It is important to evaluate the Cd accumulation potential of grain before or when examining and approving new cultivars.An evaluation method and criteria for verifying Cd accumulation potential in rice are proposed,and the Cd accumulation potential of 56 mid-season indica hybrids collected from the provincial cultivar trials in 2016 were investigated.Genotype,environment and their interactions strongly affected the variation in grain Cd accumulation.Two hybrids were identified as slightly Cd accumulating.Hybrids with slight Cd accumulation potential would be suitable for safe grain production on polluted land(total Cd under 2.0 mg$kg–1)in Hunan Province(China)and should be considered for new cultivar evaluation and approval.This evaluation method and criterion could be applied for certifying Cd accumulation potential of rice cultivars.展开更多
基金This work was supported by the Chinese Academy of Sciences （CEMPS2016009 XDA08020203）, the Ministry of Science and Technology of China （2013CB127002 2016YFD0102102）, and the National Natural Science Foundation of China （31571635）.
文摘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 Basal lnternodes （SBI）, which encodes a gibberellin 2- oxidase and specifically controls the elongation of culm basal internodes through deactivating GA activity. SBI is predominantly expressed in culm basal internodes. 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 SB! 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.
基金This research was supported by grants from the National Key Technology Research and Development Program of China(2016YFD0101801)the Rice Cadmium Accumulation Characteristics Identification Project of the Seed Management Service Station of Hunan,Special Project of National Independent Innovation Demonstration Zone(2018XK2005)Science and Technology Innovation Program(2018NK1020).
文摘As a consequence of contamination of soil with heavy metals,cadmium accumulation in grain is of great concern worldwide,but especially in southern China.It is important to evaluate the Cd accumulation potential of grain before or when examining and approving new cultivars.An evaluation method and criteria for verifying Cd accumulation potential in rice are proposed,and the Cd accumulation potential of 56 mid-season indica hybrids collected from the provincial cultivar trials in 2016 were investigated.Genotype,environment and their interactions strongly affected the variation in grain Cd accumulation.Two hybrids were identified as slightly Cd accumulating.Hybrids with slight Cd accumulation potential would be suitable for safe grain production on polluted land(total Cd under 2.0 mg$kg–1)in Hunan Province(China)and should be considered for new cultivar evaluation and approval.This evaluation method and criterion could be applied for certifying Cd accumulation potential of rice cultivars.
