Identification of compact germplasm resources suitable for high density cultivation in Brassica napus L.

摘要

Branch angle is an important plant architecture trait and is considerably important for the ideal plant architecture of high density cultivation of rapeseed.In this study,12 representative rapeseed lines were first measured for whole-plant branch angles using image processing technology.Top branch angle(TBA)and basal branch angle(BBA)were significantly different in each line in which TBA was greater than BBA.Then,156 rapeseed germplasm lines were evaluated for TBA and BBA in main cultivated regions of the Yangtze River Basin(Zunyi;Wuhan;Lu’an).In these three environments,the TBA and BBA of the rapeseed germplasm sources varied,in which ranges of 33.44°-73.17°and 18.73°-59.11°,29.66°-61.91°and 22.32°-60.16°,and 28.47°-76.32°and 22.98°-72.68°,respectively.ANOVA showed that TBA and BBA were susceptible to environmental and had broadsense heritability(H2)values of 89.09%and 87.40%,respectively.Interactions of genotype by environment were also significant.There was diversity in branch angle among rapeseed genotypes.GGE biplot analysis showed that compact accession lines(Nilla,Purler and AV-SAPPHI)were the most desirable compact genotypes in all environments.Stability analysis showed that the genotype with the most minimum branch angle was stable for compact plant architecture.