叶面施用氨基酸对菜心品质和酶活性的影响

通过盆栽试验研究了叶面喷施甘氨酸、丙氨酸、赖氨酸和谷氨酸对菜心品质和酶活性的影响。结果表明,喷施4种氨基酸均能够提高菜心产量,显著提高菜心体内可溶性糖含量,降低菜心体内硝酸盐的累积;除丙氨酸外,喷施其他3种氨基酸均能提高菜心可溶蛋白含量、降低草酸的累积;而施用氨基酸对菜心叶绿素无明显影响,致使菜心维生素C含量有所降低。同时,喷施氨基酸均能够提高菜心硝酸还原酶（NR）和谷氨酸脱氢酶（GDH）活性。说明喷施氨基酸有利于改善菜心氮代谢,降低菜心硝酸盐和草酸的积累,提高菜心可溶糖和可溶蛋白含量,改善菜心品质。

Effect of Foliar Application of Amino Acid on the Quality and Enzyme Activity of Flowering Chinese Cabbage(Brassica parachinensis Bailey)

A pot experiment was conducted to study the influences of foliar application of glycine,alanine,lysine,and glutamic acid in 200 mg/kg or 500 mg/kg upon the quality and enzyme activity of flowering Chinese cabbage(Brassica parachinensis Bailey).The results showed that all the application of these four amino acids could increase the yield of flowering Chinese cabbage,significantly raise the content of soluble sugar,and reduce the accumulation of nitrate.The applications of three other amino acids except alanine can increase the content of soluble proteins and decrease the accumulation of oxalic acid.However,the application of amino acid has insignificant influences on the SPAD number of chlorophyll,and causes the decrease of Vitamin C content.Meanwhile,the application of amino acid can improve the activity of nitrate reductase(NR) and glutamate dehydrogenase(GDH) as well.It shows that the application of amino acid is beneficial to improve ammonia metabolism,reduce the accumulation of nitrate and oxalic acid,increase the content of soluble sugar and soluble proteins,and improve the quality of flowering Chinese cabbage.