硫对大蒜生理生化指标及营养品质的影响

Effects of sulfur on physiological and biochemical indices and nutrition quality of garlic.

采用盆栽试验探讨了硫对大蒜生理生化指标及营养品质的影响 .结果表明 ,土壤硫含量 8 4 1mg·kg-1时 ,大蒜叶片硝酸还原酶、POD活性、光合色素含量、光合速率、气孔导度和蒸腾速率较高 ;可溶性蛋白质含量及CAT活性却是以土壤硫含量为 7 92mg·kg-1时最高 ;SOD活性以较低土壤硫含量 6 4 5mg·kg-1时较高 .同时 ,土壤硫含量为 8 4 1mg·kg-1时 ,鳞茎中大蒜素、可溶性糖和Vc及蒜薹中大蒜素、可溶性糖和可溶性蛋白质含量分别比对照增加 33 6 7%、2 3 75 %、6 8 82 %、4 0 95 %、3 4 5 %和 7 4 5 % ;较高土壤硫含量 9 4 8mg·kg-1有利于蒜薹中Vc和游离氨基酸及鳞茎中游离氨基酸和可溶性蛋白质含量的提高 ,分别比对照高出 15 17%、2 0 93%、6 4 9%和 8 0 7% .

The study on the effects of sulfur on physiological and biochemical indices and nutrition quality of garlic showed that when soil sulfur content was 8.41 mg·kg -1 ,the NR and POD activities,photosynthetic pigment content and photosynthetic parameter (Pn,Gs,E) in garlic leaves were higher.The soluble protein content and CAT activity reached maximum when soil sulfur content was 7.92 mg·kg -1 ,while the SOD activity was higher when soil sulfur content was 6.45 mg·kg -1 .When soil sulfur content was 8.41 mg·kg -1 ,the allicin,soluble sugar and Vc contents in bulb and the allicin,soluble sugar and soluble protein contents in bolt were increased by 33.67%,23.75%,68.82%,40.95%,3.45% and 7.45%,respectively.Higher content of soil sulfur (9.48 mg·kg -1 ) increased the contents of Vc and free amino acid in bolt and those of free amino acid and soluble protein in bulb by 15.17%,20.93%,6.49% and 8.07%,respectively.