兰州肉苁蓉营养吸收和营养繁殖方式的新发现

摘要

[Objective] This paper studied the parasitic mechanism of vegetative propagate stem of Cistanche lanzhouensis and its host Reaumuria soongarica.[Method] Morphological observation on vegetative propagate stem of Cistanche lanzhouensis was conducted.Its structure was compared with otherCistanche Hoffmg plants,and its function was analyzed using paraffin section method.[Result] C.lanzhouensis had special vegetative propagate stem with two ways of absorbing nutrition from R.soongarica roots:end parasitic and non-end parasitic methods.Vegetative propagate stem terminal expanded and surround the end part of R.soongarica root closely in the pattern of end parasitic,and broke into the xylem and phloem of R.soongarica roots.Vegetative propagate stem did not expand in non-end parasitic pattern,and the connection took place in the contact part between vegetative propagate stem and phloem of R.soongarica roots.C.lanzhouensis buds grow out from surface of vegetative propagate stem and then became propagules.[Conclusion] The vegetative propagate stem of C.lanzhouensis had the functions of nutrition absorption and vegetative propagation.%[目的]研究兰州肉苁蓉营养繁殖茎与寄主植物红砂的寄生机制.[方法]对兰州肉苁蓉的营养繁殖茎进行形态学观察,比较其与同属植物形态结构的差异,并结合石蜡切片法分析其功能.[结果]兰州肉苁蓉具有特殊的“营养繁殖茎(Vegetative propagate stem)”,其从寄主红砂吸收营养物质具有2种方式:末端寄生方式和非末端寄生方式.末端寄生时膨大的营养繁殖茎将红砂根末端封闭包围,并侵入红砂根的木质部和韧皮部;非末端寄生时营养繁殖茎不膨大,其在与寄主根的接触部分与寄主发生连接,营养繁殖茎只与寄主根的韧皮部发生连接.营养繁殖茎的表面生长出芽体,形成营养繁殖体.[结论]兰州肉苁蓉的营养繁殖茎具有吸收营养和进行营养繁殖的功能.