外源蔗糖对萝卜幼苗品质及代谢酶活性的影响

以“满堂红”品种的萝卜为材料，探究不同质量浓度的外源蔗糖喷洒处理对不同生长天数的萝卜幼苗营养品质（花青素、叶绿素、类胡萝卜素、总酚和芥子油苷等含量）及代谢酶（过氧化物酶（peroxidase，POD）和苯丙氨酸解氨酶（phenylalanine ammonialyase，PAL））活性的影响。结果表明：对于生长3、5 d和7 d的萝卜幼苗，0.4 g/100 mL和0.6 g/100 mL蔗糖处理均能够显著提高其花青素、叶绿素、类胡萝卜素、总酚、芥子油苷含量及POD、PAL活性（P＜0.05），而0.2 g/100 mL蔗糖处理对其营养物质含量及抗氧化性的影响不显著（P＞0.05）；0.4 g/100 mL和0.6 g/100 mL蔗糖处理在改善其营养价值方面的差别不大。因此，在农业生产中，可采用质量浓度0.4 g/100 mL蔗糖喷洒处理萝卜幼苗来提高其营养价值。

Effect of Exogenous Sucrose on Quality and Metabolic Enzyme Activities of Radish Sprouts

Radish (cv. Mantanghong) sprouts were adopted as the experimental material and sprayed with sucrose at
different concentrations. The variations of physiological indexes (anthocyanin, chlorophyll, carotenoid, total phenolic,
total glucosinolate, phenylalanine ammonia-lyase activity and peroxidase activity) of 3-, 5- and 7-day-old sprouts were
investigated. Results showed that the contents of anthocyanin, chlorophyll, carotenoid, total phenolic and total glucosinolate
were significantly (P < 0.05) increased by 0.4 and 0.6 g/100 mL sucrose treatment for 3-, 5- and 7-day-old sprouts, but not
influenced (P > 0.05) by 0.2 g/100 mL sucrose. There was no difference between 0.4 and 0.6 g/100 mL sucrose treatment.
Therefore, the nutritional value of radish sprouts could be increased by spraying 0.4 g/100 mL sucrose.