不同温度对七种外来杂草生理指标的影响及其适应意义

加拿大一枝黄花(Solidagocanadensis)、小飞蓬(Conyzacanadensis)、野塘蒿(Conyzabonarinsis)、钻形紫菀(Astersublatus)、一年蓬(Erigeronannuus)、马缨丹(Lantanacamara)和金鸡菊(Coreopsislanceolata)是我国东南地区有分布的7种外来杂草。测定了38°C、25°C和5°C处理下它们的可溶性糖、脯氨酸、丙二醛含量和过氧化物酶活性。结果表明,7种杂草对高温的耐受能力,由大到小分别为野塘蒿、小飞蓬、钻形紫菀、加拿大一枝黄花、马缨丹、一年蓬和金鸡菊,对低温的耐受能力,由大到小则分别为野塘蒿、小飞蓬、马缨丹、一年蓬、钻形紫菀、加拿大一枝黄花和金鸡菊。分析了四种生理指标变化的生态适应意义。

Influences of temperature on physiological indices of seven exotic weeds and their adaptive significance

Solidago canadensis,Conyza canadensis,Conyza bonarinsis,Aster sublatus,Erigeron annuus,Lantana camara and Coreopsis lanceolata are seven exotic weeds from America. The concentrations of soluble sugar,proline and malonaldehyde(MDA)as well as activity of POD of these seven weeds were tested under 5 ℃,25 °C and 38 ℃ temperature respectively. The MDA changes of the exotic weeds indicated that their resistance to high temperature of 38 ℃ ranked as Conyza bonarinsis,Conyza canadensis,Aster sublatus,Solidago Canadensis,Lantana camara,Erigeron annuus and Coreopsis lanceolata,while those to low temperature of 5 ℃ ranked as Conyza bonarinsis,Conyza canadensis,Lantana camara,Erigeron annuus,Aster sublatus,Solidago canadensis and Coreopsis lanceolata. The ecological adaptation significance of the changes of these four physiological indices was also discussed.