【摘要】 为了进一步了解铜矿区先锋植物鸭跖草的耐Cu机制,通过水培试验研究了鸭跖草的富铜及生理响应过程。结果表明,鸭跖草根系能够吸收大量的Cu离子,而其地上部Cu含量相对较小,随着Cu处理浓度的增加和处理时间的延长,鸭跖草根系和地上部Cu含量均显著增加。高浓度Cu抑制了根对Fe、Mn离子的吸收,但显著增加了其对Ca离子的吸收,Cu处理在短时间内能提高鸭跖草叶绿素和糖的含量,增加叶片的超氧化物歧化酶(SOD)活性和根系活力,而低浓度Cu处理则在短时间内可诱导谷胱甘肽(GSH)的合成。更多还原

【Abstract】 Commelina communis L.,as a pioneer plant in Cu mine,has been reported to be very strong for Cu accumulation and tolerance,but detailed studies on its physiological response to high concentration of Cu is little.Hydroponic culturing experiments were carried out to investigate the mechanisms of Cu accumulation and tolerance of Commelina communis L.,which was collected from Jiuhua copper mine in eastern Nanjing city.The plants of Commelina communis L.accumulated more Cu in its roots than in its shoots,and the contents of Cu in the root and shoot increased with the increase of Cu concentration in solution and prolonged treatment time.High concentration of Cu restrained the uptake of Mn and Fe ions in its roots,but increased the uptake of Ca ions.The presence of Cu significantly increased the content of Chl a and b,content of sugar,SOD activity and root activity,which correspondingly improved the endurances of Commelina communis L.to Cu.But this effect gradually decreased with the increasing treatment duration.Low concentration of Cu also induced the synthesis of more GSH by Commelina communis L.,which alleviated Cu toxicity.更多还原