Semi-dwarfing improves the lodging resistance and yield of rice,and the vast majority of modern rice varieties harbor the sd1 allele to decrease plant height,resulting in reduced genetic diversity and negative agronom...Semi-dwarfing improves the lodging resistance and yield of rice,and the vast majority of modern rice varieties harbor the sd1 allele to decrease plant height,resulting in reduced genetic diversity and negative agronomic traits.Thus,exploring alternative sources of dwarfism is imperative for rice breeding.Here,we identified a novel RGA1 allele,d1-w,from a local indica variety Xiaolixiang(XLX)using a map-based cloning approach.Compared with other rice varieties,RGA1 in XLX contained a unique single nucleotide polymorphism that resulted in an additional transcript and reduced functional RGA1 transcript level.The RGA1 from Nipponbare was introduced into XLX to estimate the value of d1-w in rice breeding.Compared with transgenic XLX plants(XLX^(D1)),XLX exhibited reduced plant height,increased stem strength,lower reactive oxygen species accumulation,delayed senescence,stronger photosynthesis,higher grain yield and quality(including external,milling and nutritional qualities),and enhanced resistance to drought and Rhizoctonia solani.Therefore,we proposed that the d1-w allele has potential as an excellent dwarfism resource for rice breeding.展开更多
Floral development is one of the most important determining factors of grain yield in cereal crops(Immink et al,2010).The rice inflorescence is composed of the spikelet,a specific structural unit in poaceae,which is g...Floral development is one of the most important determining factors of grain yield in cereal crops(Immink et al,2010).The rice inflorescence is composed of the spikelet,a specific structural unit in poaceae,which is greatly different from typical eudicots.However,several genes encoding the homologous of the proteins in ABCDE model were also found in rice genome(Luo and Zhu,2002).Lemma and palea are grass-specific floret tissues which interlock with each other to protect the inner floral organs and seeds from attack by pathogens,insects or abiotic stresses.Meanwhile,they have photosynthetic ability and provide amino acids and carbohydrates to grouting seeds.展开更多
基金supported by grants from the National Natural Science Foundation of China (Grant Nos. 31960403 and 31501286)Jiangxi Natural Science Foundation-Outstanding Youth Science Fund Project,China (Grant No. 20212ACB215003)
文摘Semi-dwarfing improves the lodging resistance and yield of rice,and the vast majority of modern rice varieties harbor the sd1 allele to decrease plant height,resulting in reduced genetic diversity and negative agronomic traits.Thus,exploring alternative sources of dwarfism is imperative for rice breeding.Here,we identified a novel RGA1 allele,d1-w,from a local indica variety Xiaolixiang(XLX)using a map-based cloning approach.Compared with other rice varieties,RGA1 in XLX contained a unique single nucleotide polymorphism that resulted in an additional transcript and reduced functional RGA1 transcript level.The RGA1 from Nipponbare was introduced into XLX to estimate the value of d1-w in rice breeding.Compared with transgenic XLX plants(XLX^(D1)),XLX exhibited reduced plant height,increased stem strength,lower reactive oxygen species accumulation,delayed senescence,stronger photosynthesis,higher grain yield and quality(including external,milling and nutritional qualities),and enhanced resistance to drought and Rhizoctonia solani.Therefore,we proposed that the d1-w allele has potential as an excellent dwarfism resource for rice breeding.
基金supported by the Foundation of Jiangxi Province Education Department(Grant No.GJJ160356)the National Natural Science Foundation of China(Grant No.31501286)the Science Foundation of Jiangxi Province(Grant No.20161BAB214170)。
文摘Floral development is one of the most important determining factors of grain yield in cereal crops(Immink et al,2010).The rice inflorescence is composed of the spikelet,a specific structural unit in poaceae,which is greatly different from typical eudicots.However,several genes encoding the homologous of the proteins in ABCDE model were also found in rice genome(Luo and Zhu,2002).Lemma and palea are grass-specific floret tissues which interlock with each other to protect the inner floral organs and seeds from attack by pathogens,insects or abiotic stresses.Meanwhile,they have photosynthetic ability and provide amino acids and carbohydrates to grouting seeds.
