【摘要】 为研究干旱胁迫下不同菊芋品种不同部位的蔗糖磷酸合成酶(SPS)及蔗糖转化酶(INV)的活性变化规律,采用PEG模拟与人工控水胁迫的方式对青芋1号、青芋2号两个菊芋品种进行研究。结果表明:(1)青芋1号和青芋2号在10%、20%PEG胁迫下,茎中SPS活性均较对照高,而30%PEG胁迫下茎中SPS活性较对照低,INV活性均表现较低;而不同浓度PEG胁迫处理的叶片中,SPS活性均较对照高,INV活性表现仍然较低。(2)青芋1号和青芋2号茎、叶中的SPS活性在不同控水强度胁迫前期均较对照高;青芋1号INV活性在中度控水35 d时活性较低、蔗糖合成增加,青芋2号INV活性在所有控水条件下7 d后均下降,故适宜的控水强度及控水时间可以提高青芋1号和青芋2号茎、叶中的蔗糖含量。更多还原

【Abstract】 In order to study the change rule of sucrose phosphate synthase(SPS) and invertase(INV) activities in different varieties and different parts of Helianthus tuberosus Linn under drought stress, the trials were carried out with two kinds of H. tuberosus including Qingyu1 and Qingyu2 through the way of PEG simulation with the water stress control. The results showed that:(1) the SPS activities in stems of Qingyu1 and Qingyu2 were higher than that of CK under 10% and20% PEG stress, but lower that under 30% PEG stress, and the INV activities in stems were relatively low under different concentrations of PEG stress. The SPS activities in leaves were higher than that of CK and the INV activities were still low under different concentrations of PEG stress.(2) The SPS activities in stems and leaves of Qingyu1 and Qingyu2 were higher than those of CK at the early stage of different degrees water stress control. The INV activity of Qingyu1 was relatively low on the 35 thday under moderate water stress control, which increased the sucrose synthesis, and the INV activity of Qingyu2 declined on the 7thday under different degrees of water stress control. So the appropriate intensity and duration of water stress control could improve the sucrose content in the stems and leaves of Qingyu1 and Qingyu2.更多还原