乙烯利对宿根蔗生理生化特性和农艺性状的影响

桂糖17号和新台糖22号新植蔗分蘖初期，用100mg／L乙烯利喷施叶面，促进了宿根蔗出苗并提高了苗期的叶绿素含量。继续用100mg／L乙烯利分别在宿根蔗苗期、伸长盛期喷施叶面，结果显示：苗期喷施乙烯利促进了宿根蔗的生长，改善了宿根蔗的经济性状，增加了甘蔗产量；两个时期处理都提高了宿根蔗的有效茎数、成茎率和甘蔗品质，但伸长盛期喷施乙烯利，甘蔗的茎长、茎径、单茎重比对照低。在相对干旱时期，乙烯利处理的叶片相对含水量、束缚水／自由水比值都高于对照，而丙二醛含量、组织浸提液可溶性糖含量、电导率都低于对照，说明乙烯利处理提高了宿根蔗的抗旱性。

Effects of ethephon on the physiological, biochemical and agronomic characters in ratoon sugarcane

The plant cane of two sugarcane varieties, GT17 and ROC22, was sprayed with 100 mg/L ethephon at tillering stage, which promoted the sprouting of the next ratoon cane and increased the chlorophyll content in the leaves at young stage, The ratoon cane continuously was treated by spraying 0 mg/L and 100 mg/L ethephon at young and booming stages, respectively. The results showed that the ethephon treatment at young stage promoted the ratoon cane growth, improved the economic characters, and improved the cane yield. Both the ethephon treatments at two stages increased the millable stalks and the ratio of millable stalks to total young shoots, and improved the sucrose content and decreased the reducing sugar in the juice. But the ethephon treatment at booming stage decreased the stalk length, stalk diameter and stalk weight as compared with the control. During relative drought stage, the plants with ethephon treatment showed higher stalk elongation rate, relative water content and ratio of bound water/free water, but lower malondiadehyde, soluble sugar and electrical conductance in the extracted solutions, which suggested that the ethephon treatment improve the drought resistance of the ratoon cane.