作物学报 ›› 2013, Vol. 39 ›› Issue (07): 1276-1283.doi: 10.3724/SP.J.1006.2013.01276
李先恩1,2,孙鹏2,祁建军2,周丽莉2,王绍华1,*
LI Xian-En1,2,SUN Peng2,QI Jian-Jun2,ZHOU Li-Li2,WANG Shao-Hua1,*
摘要:
块根的发育和形成与植物内源激素密切相关。本研究测定地黄2个栽培种和2个野生种在生长发育过程中内源激素含量表明,地黄叶片中IAA、ZR和ABA含量变化均呈单峰曲线,即在拉线期及快速增长期逐渐升高,之后逐渐降低,但各生育期栽培种叶片中IAA、ZR和ABA含量均高于野生种;栽培种与野生种块根中IAA和ZR含量变化规律明显不同,在拉线期与快速增长期,栽培种迅速上升,而后逐渐降低,而在整个生长期野生种变化不明显;整个生育期参试品种叶片中GA含量变化不大,栽培种在快速增长期根中GA、ABA的含量迅速上升,而野生种变化不明显。从上述变化规律来看,地黄块根的形成与发育是多种内源激素协同作用的结果。IAA和ZR是块根起始分化关键激素,决定了块根的形成,GA、ABA在地黄块根的发育与膨大中起了更重要的作用。
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