多胺和赤霉素在莴苣种子萌发中的作用及其相互关系  

EFFECTS OF POLYAMINES,GIBBERELLIC ACID AND THEIR RELATIONSHIP ON GERMINATION OF LETTUCE SEEDS

作　　者：贺军民[1] 黄维玉 王晓明 佘小平[1] 王之[1] 

机构地区：[1]陕西师范大学生物系

出　　处：《西北植物学报》1994年第1期33-38,共6页Acta Botanica Boreali-Occidentalia Sinica

摘　　要：非感光性莴苣（挂丝红品种）种子于２２℃下萌发率在８０％左右，而２８℃下不萌发。２２℃下外源亚精胺显著促进种子萌发，多胺生物合成抑制剂ＤＦＭＡ和ＤＣＨＡ明显抑制种子萌发，而ＤＦＭＯ无效。２２℃诱导种子萌发过程中内源腐胺和亚精胺含量显著高于２８℃下它们的含量。ＧＡ＿３处理能诱导２８℃下种子的萌发，单独外源亚精胺处理效果不大，而外源亚精胺对ＧＡ＿３诱导效应有促进作用。ＤＦ－ＭＡ和ＤＣＨＡ能抑制ＧＡ＿３诱导２８℃下种子的萌发，此抑制效应又能被外源亚精胺部分逆转。ＧＡ＿３处理也提高了２８℃下种子内源腐胺和亚精胺的含量。Effects of polyamines,gibberellic acid and their relationship on germinatoin of lettuce(Latuca sativa L.)seeds were investigated.The seeds were not sensitive to light but highlyto temperature. About 80% of seeds germinated at 22℃, but no seed germinated at 28℃ ei-ther under the light or in the dark.The germination of seeds incubated at 22℃ was promotedby spermidine(Spd),it was inhibited by DFMA and DCHA,while DFMO was non-effective.The contents of endogenous putrescine(Put)and Spd in the seeds incubated at 22℃ for l2,24,48 or 72 hours were much greater than those at 28℃。 GA_3 could induce germination ofseeds at 28℃,while Spd could not do it. The GA_-induced germination of seeds could be en-hanced by Spd and inhibited by DFMA and DCHA,and their inhibitions were partially re-versed by Spd. GA_3 treatment promoted the contents of endogenous Put and Spd of seeds at28℃. These results suggested Put and Spd played an important role in germination of Lat-tuce seeds;and that GA_3-induced the enhancement of polyamine contents was one of the rea-sons that GA_3 broke the dormancy of seeds at 28℃。

关 键 词：莴苣 种子 多胺 赤霉素 萌发 

分 类 号：S636.201[农业科学—蔬菜学]