关键词: 双低甘蓝型油菜, 菜薹, 营养品质, 变异系数, 相关系数

Abstract: In order to clarify the nutritional quality characteristics of flower stalk of different rapeseedvarieties（Brassica napus L.）, the nutritional quality of three double-low rapeseedvarieties is analyzed, and compared with that of a cruciferous vegetable Chinese cabbageunder the same cultivation conditions. Theresearch shows that three double-low rapeseedvarieties are different in nine quality indicators, i.e., vitamin B₁, vitamin B₂,vitamin C, protein, soluble sugar, crude fiber, calcium, iron and zinc. Specifically speaking, the coefficients of variation for content of vitamin B₂, soluble sugar, zinc and calcium are greater than 10.000%,indicating that a big difference betweenthese varieties, while the coefficients of variation for content of vitamin C, vitamin B₁, protein, crude fiber and iron are less than 10.000%, suggesting a small difference betweenthese varieties. There is an extremelysignificant positive correlation between zinc andvitamin C as well as zinc and protein content, with the correlation coefficients 0.857 8 and 0.866 4,respectively. The protein content is extremelysignificant positively correlated with vitamin B₁ content and vitamin B₂ content, with the respective correlation coefficients 0.865 3 and 0.838 7. Calcium content is negatively correlated with other nutritional quality indexes, without reaching a significant level. Compared with the Chinese cabbage,the comprehensive nutritional components of flower stalk in the double-low rapeseed are higher, wherein the vitamin C content and zinc content are more than 1.7 times of those in the Chinese cabbage,the iron content is more than 1.3 times of that in the Chinese cabbage. These suggest that flower stalk of the double-low rapeseed hasricher nutrition and higher edible value than the Chinese cabbage.

Key words: double-low Brassica napus L., flower stalk, nutritional quality, coefficient of variation, coefficient of correlation