Construction of an ideal plant type of Brassica napus with high rapeseed yield per plant
This study aimed to identify the plant type factors that affect grain yield per plant of Brassica napus and to develop an ideal plant type for high-yield rapeseed per plant.Three different fertility treatments were carried out on three representative varieties of B.napus in Hunan.Eleven plant type indexes including leaf area,pod area,and rapeseed yield of 81 plants at four growth stages(seedling,initial flowering,full-blooming,and pod-filling stag-es)were obtained by non-destructive measurement.Based on an analysis of the relevant plant type indicators at dif-ferent growth stages,the basic growth laws of the relevant plant type indicators were explored.The plant type index-es related to rapeseed yield were analyzed,and it was found that several plant type indexes at different growth stages were significantly correlated with them.Among them,rapeseed yield,pod number,branch length,and pod area of each branch at the pod stage were significantly positively correlated with rapeseed yield per plant,and the correla-tion coefficients of the corresponding plant type indexes of each branch showed similar variation trends.Branch number,leaf area,green leaf number,root-neck thickness,and plant height were significantly positively correlated with rapeseed yield per plant,and the correlation coefficient showed a corresponding trend according to the different growth stages.Branch height and relative height of the branch were significantly negatively correlated with rapeseed yield per plant,and the relative length of the branch segment was significantly positively correlated with rapeseed yield per plant.The related characteristics and growth rules of the first 10%and 20%rapeseed yields per plant were analyzed.Except that the branch height and the relative height of the branches were significantly reduced,the other plant type indexes were increased to different degrees compared with the corresponding indexes of the overall sam-ples.The first 10%of the yield samples and the first 20%of the yield samples showed similar trends,but the corre-sponding values increased or decreased more.Ideal plant type characteristics of B.napus at different growth stages were qualitatively and quantitatively described.The ideal plant type has the characteristics of a"large surface area of photosynthetic organs(leaves and pods),strong root-neck,low branch position,strong lodging resistance,sec-ondary branches,and the increased corresponding pod number".The formation principle of the ideal plant type of B.napus was analyzed from three aspects:photosynthetic efficiency,morphological structure,and source-sink-flow principles.The construction strategy,application method,and research shortcomings of the ideal plant type of B.na-pus were discussed.
万方数据
维普
