叶菜型甘薯蔓尖黄酮类化合物含量在不同品种、部位和采收期的变化

目的:研究叶菜型甘薯蔓尖黄酮类化合物含量在不同品种、部位和采收期的变化。方法:在全国叶菜型甘薯新品种区域试验重庆点,测定和分析莆薯53、广菜薯2号和福薯7-63个品种蔓尖的叶片、叶柄和茎3个部位在6个采收时期的黄酮类化合物含量及其变化。结果:莆薯53、广菜薯2号和福薯7-6蔓尖黄酮类化合物质量分数在采收期间的变化分别介于9.60～19.98,12.93～25.08,9.33～25.16mg.g-1,品种之间有显著差异;3个品种叶片的平均质量分数在采收期间的变化为3.66～11.09mg.g-1,显著高于茎(4.03～7.79mg.g-1),茎显著高于叶柄(2.20～5.26mg.g-1);采收前期蔓尖黄酮类化合物含量显著高于采收后期。结论:在叶菜型甘薯的品种选育、栽培和产业化等过程中应充分考虑其蔓尖黄酮类化合物含量在不同的品种、不同的部位和不同的采收时期的显著差异。

Variations of flavanoid contents in vine tips among different varieties, parts and time of topping of sweetpotato for vegetable-use

Objective : To study the variations of flavonoids contents in vine tips of sweetpotato(Ipomoea batatas) among different varieties, parts and the time of topping. Method : The flavonoid contents in leaf, petiole and stem of vine tips at 6 different topping time of 3 varieties for vegetable-use Pushu 53, Guangcaishu No.2 and Fushu 7-6,which were collected from Chongqing were determined by UV spectrophotometry with rutin as a standard substance. Result : The results showed that the flavonoid content of Guangcaishu No.2 was higher than that of Pusu 53, so was that of Pusu 53 than that of Fushu 7-6. The average flavonoid contents in leaf of 3 varieties were between 3.66 mg·L^-1 and 11.09 mg·L^-1 during 6 topping time, and those in petiole, stem were between 2.20-5.26 mg·L^-1 and 4.03-7.79 mg·L^-1, respectively. The rations of average flavonoid contents in leaf, petiole and stem to the total contents of vine tips among 3 varieties during their whole topping periods were 46.71%, 20.65% and 32.63%, respectively. The contents during earlier topping time were higher than those of later periods. The variance analysis of flavonoid contents revealed that there was significant difference between different varieties, parts and time of topping and significant interactions among varieties, parts and time of topping. Conclusion : The results of the study indicate that the contents of flavonoid should be considered for the breeding, cultivation and industrialization of sweetpotato for vegetable-use.