乙烯利对不同甘蔗品种光合特性的影响

Effects of ethephon on photosynthetic characteristics in different sugarcane varieties

本试验选用4个熟性不同的甘蔗品种桂糖11号、桂糖17号、新台糖10号、新台糖20号作为供试材料,在甘蔗生长前期以100mg/L乙烯利进行叶面喷施,测定了叶片中C4途径的两个关键光合酶活性、叶绿素含量、净光合速率和蒸腾速率,并分析了这些因素与甘蔗生长的关系。结果表明:(1)乙烯利处理可以提高甘蔗叶片中NADP-苹果酸酶的活性,而对磷酸烯醇式丙酮酸羧化酶(PEPC)的活性因品种不同有一定差异,对桂糖11号与桂糖17号有明显的促进效应,而对新台糖20号却表现了一定的抑制。(2)乙烯利处理提高了叶片中叶绿素的含量。(3)乙烯利处理可以提高甘蔗的光合速率和蒸腾速率,但对不同品种的效应不同,尤以对桂糖11号和新台糖10号的效应最明显。

Four sugarcane varieties, namely, earlier-maturing T20, early-maturing GT11, intermediate-early T10 and intermediate GT17 were grown under the normal growing condition in the field The plants were sprayed with 100 mg/L of ethephon on the leaves at early growth stage The control was sprayed with water After being treated, the activities of phosphoenolpyruvate carboxylase(PEPC) and NADP-malic enzyme , contents of chlorophyll in leaf +1,net photosynthetic rate and transpirate rate were measured It showed that the ethephon treatment improved the activity of NADP-malic emzyme and the contents of chlorophyll But as to activities of PEPC, there were different results in four varieties Treatment improved the activity of PEPC in G11 and G17,however,inhibited it in T20Meanwhile,the ethephon treatment could improve the net photosynthetic rate and transpirate rate of sugarcane,especially in G11 and T10.