希蒙得木对高温胁迫的生理响应  

Physiological Responses of Simmondsia chinensis Seedlings to High Temperature Stress

作　　者：李晓清[1] 曹小军[1] 王启和[1] 李荣伟[1] 王准[1] 

机构地区：[1]四川省林业科学研究院,四川成都610081

出　　处：《西南林学院学报》2011年第3期1-6,共6页Journal of Southwest Forestry College

基　　金：国家林业局948引进项目(20000404)资助

摘　　要：以希蒙得木自然分布区和引种驯化的7个地理种源为研究对象,采用盆栽育苗温棚控温方法设置3个温度处理水平,观察其对高温胁迫的生理响应。结果表明:高温胁迫下,不同种源各生理指标表现出相似的变化规律;不同种源的叶片水分含量均在高温胁迫下下降,膜的通透性增加;不同种源幼苗叶片在T1处理下过氧化物酶(POD)活性显著高于对照,超氧化物歧化酶(SOD)活性低于对照,但在T2处理下,不同种源的SOD又表现出较高活性;T1和T22种高温胁迫,其丙二醛含量变化规律不明显,脯氨酸含量显著增加;可溶性蛋白随胁迫程度的加重,其含量变化趋势为先升后降;热胁迫下,各种源幼苗叶片可溶性糖含量变化规律不一致。The physiological response to the high temperature by 7 provenances of Simmondsia chinensis collected from both in its natural distribution area and in the introduction-domestication area was experimented with pot-grown seedlings in the temperature controlled greenhouse treated with three different levels of high temperature stress. The results indicated that the different provenances showed the similar way of change in the physiological in- dexes under high temperature stress. The leaf water content of the all different provenances decreased and the cell membrane permeability increased under the heat stress. The POD activity of all different provenances under Tl treatment was significantly higher than that of the CK, while the SOD activity of different provenances was lower than CK under the same stress. Under the T2 treatment, the SOD activity of different provenances was higher. There was no distinct law of change in the MDA content, but with significant increase of proline content under both Tj and T2 heat treatment. Along with the development of the high temperature stress, the content of soluble protein increased at first and then decreased with the increment of heat stress degree. Under heat stress, the soluble sugar content of each provenance seedling leaves did not show consistent change trend.

关 键 词：希蒙得木 热胁迫 生理生化指标 

分 类 号：S718[农业科学—林学] Q945.78[生物学—植物学]