It is essential to evaluate agronomic and quality traits when using elite lines in rapeseed （Brassica napus L. ） breeding. 92 rapeseed accessions （44 Chinese, 22 European, 16 USA and 10 Ca-nadian） were evaluate...It is essential to evaluate agronomic and quality traits when using elite lines in rapeseed （Brassica napus L. ） breeding. 92 rapeseed accessions （44 Chinese, 22 European, 16 USA and 10 Ca-nadian） were evaluated by 16 agronomic and quality traits in Northern China. Analysis of variance among the 92 accessions revealed significant differences on 13 traits. The 13 traits were plant height, setting po-sition of the first primary branch, silique number （ on terminal raceme） , silique density, siliques per plant, seeds per silique, thousand seed weight, seed yield per plant, flowering time, final flowering, ma-turity time, cold mortality, and oil content. Other 3 traits were not significant （primary branches per plant, terminal raceme length and seed protein） . Cluster analysis revealed that 92 accessions were clus-tered into 3 major groups. The 1st group had 10 Canadian and 5 Chinese. The 2nd group had 33 acces-sions from China and 5 from Europe. The 3rd group had 39 accessions from Europe and the USA. For ag-ronomy and quality traits, 45. 73% genetic variation attributed to differences among populations of geo-graphic regions, and 54. 27% attributed to differences within geographic regions. In summary, the a-broad accessions were distinguished from domestic ones, and could be used as important germplasm re-sources for enriching the genetic background of Chinese rapeseed, and vice versa.展开更多
This paper mainly starts from the perspectives of management and economics,combined with the characteristics of the construction industry,conducts qualitative and quantitative analysis of the risks involved,studies va...This paper mainly starts from the perspectives of management and economics,combined with the characteristics of the construction industry,conducts qualitative and quantitative analysis of the risks involved,studies various factors that cause construction enterprise risks from multiple angles,and uses scientific and effective methods to identify and evaluate risks,as well as determine the risk level.Through the overall risk management response strategies and empirical research of construction enterprises,this paper analyzes the general theory and main avoidance strategies of risk response of construction enterprises,and lays the foundation for follow-up risk management response in the form of cases through the implementation of technical route and innovation points.展开更多
文摘It is essential to evaluate agronomic and quality traits when using elite lines in rapeseed （Brassica napus L. ） breeding. 92 rapeseed accessions （44 Chinese, 22 European, 16 USA and 10 Ca-nadian） were evaluated by 16 agronomic and quality traits in Northern China. Analysis of variance among the 92 accessions revealed significant differences on 13 traits. The 13 traits were plant height, setting po-sition of the first primary branch, silique number （ on terminal raceme） , silique density, siliques per plant, seeds per silique, thousand seed weight, seed yield per plant, flowering time, final flowering, ma-turity time, cold mortality, and oil content. Other 3 traits were not significant （primary branches per plant, terminal raceme length and seed protein） . Cluster analysis revealed that 92 accessions were clus-tered into 3 major groups. The 1st group had 10 Canadian and 5 Chinese. The 2nd group had 33 acces-sions from China and 5 from Europe. The 3rd group had 39 accessions from Europe and the USA. For ag-ronomy and quality traits, 45. 73% genetic variation attributed to differences among populations of geo-graphic regions, and 54. 27% attributed to differences within geographic regions. In summary, the a-broad accessions were distinguished from domestic ones, and could be used as important germplasm re-sources for enriching the genetic background of Chinese rapeseed, and vice versa.
文摘This paper mainly starts from the perspectives of management and economics,combined with the characteristics of the construction industry,conducts qualitative and quantitative analysis of the risks involved,studies various factors that cause construction enterprise risks from multiple angles,and uses scientific and effective methods to identify and evaluate risks,as well as determine the risk level.Through the overall risk management response strategies and empirical research of construction enterprises,this paper analyzes the general theory and main avoidance strategies of risk response of construction enterprises,and lays the foundation for follow-up risk management response in the form of cases through the implementation of technical route and innovation points.
