The Effects of TFIBA and IBA on Seminal Root Length and Initiation of Lateral Root Primordial of Rice and Lettuce Seedlings

适宜浓度的TFIBA显著促进了莴苣和水稻初生种子根的伸长生长 ,抑制了水稻种子根侧根原基的发生 ,但对莴苣侧根原基的发生无任何作用 ,对根顶端优势的调控与IBA相反The effects of 4,4,4 trifluoro 3 (indole 3 )butyric acid (TFIBA) and indole 3 butyric acid (IBA) on the growth of primary roots and the genesis of lateral root primordial (LRP) were investigated. It was found that TFIBA at range of 0.001～10 μmol·L -1 inhibited the initiation of LRP while promoted the growth of primary roots of rice seedlings, whose effect was contrary to that of IBA. TFIBA at range of 0.1～100 μmol·L -1 also promoted the growth of lettuce seedlings while did not exhibit any promotive effect on the initiation of LRP