What substance normally controls a given biological process?: II. The relation of auxin to apical dominance☆

[摘要] 1.1.Reviewingtheliteratureonapicaldominanceinthelightofthe“PESIGS”rulesformulatedintheprecedingpaper(Jacobs,1959)madeclearthatearlierresearchershadneverdemonstratedexactsubstitutionofsyntheticauxinforthenativeauxinoftheapex.2.2.OurcloneofColeusblumeiBenth.showsapicaldominance:excisingthetopofthemainshootinducesgreatergrowthoftheyoungersideshoots.3.3.Onepercentindoleaceticacidinlanolinexactlysubstitutesforthetopofthemainshootinprovidingauxinthroughnode2,incausingfasterabscissionthroughnode4,andincausingxylemregenerationininternode2.Andyetthis1%IAAinlanolinhasnoinhibitingeffectonthegrowthofthesideshoots.4.4.Weconcludethatcontrarytotheclassictheory,apicaldominanceinColeusisnotcontrolledbyauxinfromtheapex.

[学科分类] 生物科学（综合）