外源乙烯的处理时机对甘薯抑芽及碳水化合物代谢的影响

以未用外源乙烯处理的甘薯开始出现发芽迹象的时间为节点,采用1 g/L外源乙烯分别在节点前、节点后及储运全程进行处理,研究外源乙烯处理的不同时机对甘薯常温储运期间发芽的调控及碳水化合物代谢的影响。结果表明,所有时机乙烯处理均会促进甘薯呼吸,加速块根淀粉、还原糖含量下降,诱导α-淀粉酶、β-淀粉酶活性增大。节点后和全程1 g/L乙烯处理能更好抑制甘薯发芽,且能明显增强甘薯的磷酸蔗糖合成酶、中性转化酶活性,降低酸性转化酶活性,维持较高的可溶性总糖含量、蔗糖含量,甘薯甜度更高。

Effects of the treatment timing of exogenous ethylene on bud inhibition and carbohydrate metabolism in sweet potato

The germination time of sweet potato which not treated with exogenous ethylene was taken as the node.The concentration of 1 g/L exogenous ethylene was treated before the node,after the node and during storage and transportation,respectively.To study the effects of exogenous ethylene treatment timing on the regulation of germination and carbohydrate metabolism of sweet potato during ambient temperature storage and transportation.The results revealed that ethylene treatment could promote the respiration of sweet potato,decrease the content of tuberous starch and sugar,and increase the activation ofα-amylase andβ-amylase.Ethylene treatment with the dose of 1 g/L of whole process or post the node can better inhibit sweet potato sprout,and can significantly enhance the sucrose phosphate synthase(SPS)and the neutral invertase(NI)of sweet potato,reduce the acid invertase(AI),maintain higher soluble total sugar and sucrose content.Thus,sweetness of sweet potato would be higher.