夜间低温对栽培和野生番茄果实抗逆性的影响

摘要

以低温敏感性栽培番茄Money Maker和耐低温性野生番茄LA1777为试材,研究了夜间15,9,6℃及其恢复处理对番茄果实中抗逆生理指标的影响.结果表明,夜间低温胁迫后,LA1777和Money Maker中可溶性糖和脯氨酸含量急剧增加,过氧化物酶(POD)活性上升,特别是前者；LA1777中超氧化物歧化酶(SOD)活性低于对照,过氧化氢酶(CAT)活性高于对照,而Money Maker中变化与之相反；Money Maker中丙二醛(MDA)含量增加,显著高于对照,而LA1777差异不显著.说明2种番茄通过提高脯氨酸含量来调节渗透势响应低温,耐低温性番茄通过提高POD和CAT的活性来提高抗低温能力,而低温敏感性番茄通过提高SOD的活性来适应低温；耐低温的番茄受伤害程度较低.%Chilling-sensitive tomato Money Maker and chilling-tolerant wild tomato LA 1777 were studied, and effects of low night temperature of 15,9,6? and recovery on the resistant physiological index of tomato fruits were investigated. The results showed that soluble sugar,proline content and POD activities increased in tomatoes LA 1777 and Money Maker after low night temeperature treated, but the variation in LA 1777 is greater. SOD activity in LA1777 was lower than control,CAT activities was higher than control,otherwise,the SOD activity in Money Maker was higher than control, CAT activities was lower than control. The increase of MDA content in Money Maker was significantly greater than control, while no significant change in LA1777. These results demonstrate that the two types of tomato fruits exerted higher level of soluble sugar and proline content to chilling stress under short-time low temperature,the chilling-tolerant tomato exerted higher level of POD and CAT activities to chilling stress,while the chilling-sensitive tomato exerted higher level of SOD activity, the enhanced membrane lipid peroxidation in the chilling-tolerant tomato fruits is lower.