Background Cotton is an economically important crop.It is crucial to find an effective method to improve cotton yield,and one approach is to decrease the abscission of cotton bolls and buds.However,the lack of knowled...Background Cotton is an economically important crop.It is crucial to find an effective method to improve cotton yield,and one approach is to decrease the abscission of cotton bolls and buds.However,the lack of knowledge of the genetic and molecular mechanisms underlying cotton boll abscission traits has hindered genetic improvements.Results Pearson’s correlation analysis revealed a significant positive correlation between boll abscission rates 1(AR1)and boll abscission rates 2(AR2).A genome-wide association study was conducted on 145 loci that exhibited high polymorphism and were uniformly distributed across 26 chromosomes(pair).The study revealed 18,46,and 62 markers that were significantly associated with boll abscission,fiber quality,and yield traits(P<0.05),explaining 1.75%–7.13%,1.16%–9.58%,and 1.40%–5.44%of the phenotypic variation,respectively.Notably,the marker MON_SHIN-1584b was associated with the cotton boll abscission trait,whereas MON_CGR5732a was associated with cotton boll abscission and fiber quality traits.Thirteen of the marker loci identified in this study had been previously reported.Based on phenotypic effects,six typical cultivars with elite alleles related to cotton boll abscission,fiber quality,and yield traits were identified.These cultivars hold great promise for widespread utilization in breeding programs.Conclusions These results lay the foundation for understanding the molecular regulatory mechanism of cotton boll abscission and provide data for the future improvement of cotton breeding.展开更多
Background: Cotton fiber yield is a complex trait,which can be influenced by multiple agronomic traits.Unravelling the genetic basis of cotton fiber yield-related traits contributes to genetic improvement of cotton.Re...Background: Cotton fiber yield is a complex trait,which can be influenced by multiple agronomic traits.Unravelling the genetic basis of cotton fiber yield-related traits contributes to genetic improvement of cotton.Results: In this study,503 upland cotton varieties covering the four breeding stages(BS1–BS4,1911–2011)in China were used for association mapping and domestication analysis.One hundred and forty SSR markers significantly associated with ten fiber yield-related traits were identified,among which,29 markers showed an increasing trend contribution to cotton yield-related traits from BS1 to BS4,and 26 markers showed decreased trend effect.Four favorable alleles of 9 major loci(R^(2)≥3)were strongly selected during the breeding stages,and the candidate genes of the four strongly selected alleles were predicated according to the gene function annotation and tissue expression data.Conclusions :The study not only uncovers the genetic basis of 10 cotton yield-related traits but also provides genetic evidence for cotton improvement during the cotton breeding process in China.展开更多
英语复合旬中,从句作定语时,一般位于紧靠它所修饰的词语之后。限制性定语从旬,尤其是这样。如: The side which makes the bigger and louder noise is naturally the majority and the policy is decided in their favor.(高中试用本B...英语复合旬中,从句作定语时,一般位于紧靠它所修饰的词语之后。限制性定语从旬,尤其是这样。如: The side which makes the bigger and louder noise is naturally the majority and the policy is decided in their favor.(高中试用本B.I.p.48) 然而,由于种种原因,有时定语从句与其所修饰的词语之间,往往被某些句子成份割裂开来。展开更多
In this paper we describe the effects of tri（3, 4-dimethylphenyl）phosphite[（3,4-（CH<sub>3</sub>）<sub>2</sub>C<sub>6</sub>H<sub>3</sub>O）<sub>3</sub>P]o...In this paper we describe the effects of tri（3, 4-dimethylphenyl）phosphite[（3,4-（CH<sub>3</sub>）<sub>2</sub>C<sub>6</sub>H<sub>3</sub>O）<sub>3</sub>P]or triphenylphosphine（PPh<sub>3</sub>）used as ligand in the homogeneoushydroformylation of alkene using dicarbonyl acetylacetone rhodium as the parent catalyst.The reaction kineties has been investigated.It was found that tri（3,4-dimethylphenyl）-phosphite has greater activity and better selcctivity than PPh<sub>3</sub> for hydroformylation ofheptene-1.The results are discussed in terms of eiectronic and stereochemical effects.展开更多
基金Key Laboratory of Cotton Biology Open Fund(CB2022A11)National Natural Science Foundation of China(32260510)+3 种基金Innovation talent Program in Sciences and Technologies of Xinjiang Production and Construction Corps,China(2021CB028)Key Programs for Science and Technology Development of Shihezi city,Xinjiang Production and Construction Crops,China(2022NY01)Science and Technology Planning of Shuanghe city,Xinjiang Production and Construction Crops,China(2021NY02)key programs for science and technology development in agricultural field of Xinjiang Production and Construction Corps,China.
文摘Background Cotton is an economically important crop.It is crucial to find an effective method to improve cotton yield,and one approach is to decrease the abscission of cotton bolls and buds.However,the lack of knowledge of the genetic and molecular mechanisms underlying cotton boll abscission traits has hindered genetic improvements.Results Pearson’s correlation analysis revealed a significant positive correlation between boll abscission rates 1(AR1)and boll abscission rates 2(AR2).A genome-wide association study was conducted on 145 loci that exhibited high polymorphism and were uniformly distributed across 26 chromosomes(pair).The study revealed 18,46,and 62 markers that were significantly associated with boll abscission,fiber quality,and yield traits(P<0.05),explaining 1.75%–7.13%,1.16%–9.58%,and 1.40%–5.44%of the phenotypic variation,respectively.Notably,the marker MON_SHIN-1584b was associated with the cotton boll abscission trait,whereas MON_CGR5732a was associated with cotton boll abscission and fiber quality traits.Thirteen of the marker loci identified in this study had been previously reported.Based on phenotypic effects,six typical cultivars with elite alleles related to cotton boll abscission,fiber quality,and yield traits were identified.These cultivars hold great promise for widespread utilization in breeding programs.Conclusions These results lay the foundation for understanding the molecular regulatory mechanism of cotton boll abscission and provide data for the future improvement of cotton breeding.
基金This work was supported by the National Natural Science Foundation of China(31760402)Young and Middle-aged Science and Technology Leading Talents of Xinjiang Production and Construction Corps(2019CB027).
文摘Background: Cotton fiber yield is a complex trait,which can be influenced by multiple agronomic traits.Unravelling the genetic basis of cotton fiber yield-related traits contributes to genetic improvement of cotton.Results: In this study,503 upland cotton varieties covering the four breeding stages(BS1–BS4,1911–2011)in China were used for association mapping and domestication analysis.One hundred and forty SSR markers significantly associated with ten fiber yield-related traits were identified,among which,29 markers showed an increasing trend contribution to cotton yield-related traits from BS1 to BS4,and 26 markers showed decreased trend effect.Four favorable alleles of 9 major loci(R^(2)≥3)were strongly selected during the breeding stages,and the candidate genes of the four strongly selected alleles were predicated according to the gene function annotation and tissue expression data.Conclusions :The study not only uncovers the genetic basis of 10 cotton yield-related traits but also provides genetic evidence for cotton improvement during the cotton breeding process in China.
文摘英语复合旬中,从句作定语时,一般位于紧靠它所修饰的词语之后。限制性定语从旬,尤其是这样。如: The side which makes the bigger and louder noise is naturally the majority and the policy is decided in their favor.(高中试用本B.I.p.48) 然而,由于种种原因,有时定语从句与其所修饰的词语之间,往往被某些句子成份割裂开来。
文摘In this paper we describe the effects of tri（3, 4-dimethylphenyl）phosphite[（3,4-（CH<sub>3</sub>）<sub>2</sub>C<sub>6</sub>H<sub>3</sub>O）<sub>3</sub>P]or triphenylphosphine（PPh<sub>3</sub>）used as ligand in the homogeneoushydroformylation of alkene using dicarbonyl acetylacetone rhodium as the parent catalyst.The reaction kineties has been investigated.It was found that tri（3,4-dimethylphenyl）-phosphite has greater activity and better selcctivity than PPh<sub>3</sub> for hydroformylation ofheptene-1.The results are discussed in terms of eiectronic and stereochemical effects.
