曼陀罗及其变种对温度变化的适应性研究

为探究入侵杂草曼陀罗和紫花曼陀罗对温度变化的适应性,利用人工培养箱调控温度条件,研究曼陀罗(Datura stramonium)及其变种紫花曼陀罗(Datura stramonium var.tatual)在20、25、30和35℃环境下,两者叶片色素含量、茎中类黄酮和总酚含量及变化趋势差异,以及叶片解剖结构的差异.研究结果显示:同温度下曼陀罗栅栏组织厚度与海绵组织厚度之比小于紫花曼陀罗,上、下表皮气孔指数均明显低于紫花曼陀罗;紫花曼陀罗叶片叶绿素/类胡萝卜素值随温度变化呈先升后降趋势,曼陀罗叶片的叶绿素/类胡萝卜变化趋势无规律性;同温度下紫花曼陀罗的花青素苷、总酚、类黄酮含量显著高于曼陀罗.研究结果从植物形态结构和生理特征方面显示出,紫花曼陀罗对温度变化的适应能力高于曼陀罗.

Study on Adaptability of Datura stramonium and Datura stramonium var.tatual to Temperature

This study was conducted to investigate the temperature adaptability of Datura stramonium and D.stramonium var.tatual.Under 4 temperature levels,plantgrowth and pigment concentrations in leaves and stems were determined,and leaf anatomic structures of D.stramonium var.tatual and D.stramonium were analyzed.The results showed that the palisade tissue thickness/sponge tissue thickness,stomatal density and stomatal index values of D.stramonium var.tatual were significantly greater than D.stramonium;the chlorophyll content/carotenoid content in leaves of D.stramonium var.tatual increased at first and decreased then,while no regularity was found in leaves of D.stramonium;and the contents of anthocyanin,flavonoids,and total phenols in stems of D.stramonium var.tatual were significantly higher than those in stems of D.stramonium.The temperature adaptability of D.stramonium var.tatual is stronger than that of D.stramonium.