Preliminary studies on root morphological traits in Brassica napus L.
Plant root system plays a crucial role in plant growth and root system morphology contributes also a great deal to the final crop yield. The research on root system is generally difficult, but the morphological traits are more visible and simple compared with physiological traits. Three Polima cytoplasm male sterile lines and four restoration lines were used as parents to get twelve hybrid combinations with NCII genetic design. The plot trials for F1s and their parents, 3 counterpart maintainers of CMS and two lodging resistant varieties were arranged in the field in a randomized complete block design with 3 replications. Eight root traits and plot yield were investigated. We clearly demonstrated that the same root characteristics in different parents had the real genetic differences. There were no significant difference in the root morphological traits between CMS lines and maintainer lines. The main root length of hybrids, CMS lines and maintainers was significantly longer than that of restorers. Hybrids had significantly more lateral roots than CMS lines, maintainers and restorers. The main root length, maximum lateral root length, root thickness, zmain root dry weight, lateral root dry weight, root dry weight and root volume of lodging resistant varieties were significantly better than those of other materials. Plot yield of all 12 hybrids showed positive heterosis and root trait also showed heterosis in a part of crosses. The results of correlation analysis on all 24 test materials showed that there were significant correlations among maximum lateral root length, main root dry weight, lateral root dry weight, root dry weight and root volume, in which root dry weight and root volume had the highest correlation coefficient (r=0.9671**). Plot yield had a positive correlation in a certain degree with maximum lateral root length, root thickness, main root dry weight, lateral root dry weight, root dry weight, and root volume, but did not reach significant levels.
Brassica napus L. root system morphological traits yield
MEI Desheng LI Yunchang HU Qiong LI Yingde XU Yusong
Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062 China
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
1131-1133
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）