Zhang Nenggang, Hasenstein Karl H
Department of Biology, University of Louisiana, Lafayette, LA 70504-2451, USA.
Physiol Plant. 2002 Nov;116(3):383-8. doi: 10.1034/j.1399-3054.2002.1160314.x.
We studied the mode of action of 4,4,4-trifluoro-3- (indole-3-) butyric acid (TFIBA), a recently described root growth stimulator, on primary root growth of Lactuca sativa L. seedlings. TFIBA (100 micromoles) promoted elongation of primary roots by 40% in 72 h but inhibited hypocotyl growth by 35%. TFIBA induced root growth was independent of pH. TFIBA did not affect ethylene production, but reduced the inhibitory effect of ethylene on root elongation. TFIBA promoted root growth even in the presence of the ethylene biosynthesis inhibitor L-alpha-(2-aminoethoxyvinyl)glycine. TFIBA and the ethylene-binding inhibitor silver thiosulphate (STS) had a similar effect on root elongation. The results indicate that TFIBA-stimulated root elongation was neither pH-dependent nor related to inhibition of ethylene synthesis, but was possibly related to ethylene action.
我们研究了最近描述的一种根系生长刺激剂4,4,4-三氟-3-(吲哚-3-)丁酸(TFIBA)对莴苣幼苗初生根生长的作用方式。TFIBA(100微摩尔)在72小时内使初生根伸长40%,但使下胚轴生长受到35%的抑制。TFIBA诱导的根系生长与pH无关。TFIBA不影响乙烯生成,但降低了乙烯对根系伸长的抑制作用。即使在存在乙烯生物合成抑制剂L-α-(2-氨基乙氧基乙烯基)甘氨酸的情况下,TFIBA仍能促进根系生长。TFIBA与乙烯结合抑制剂硫代硫酸银(STS)对根系伸长具有相似的作用。结果表明,TFIBA刺激的根系伸长既不依赖于pH,也与乙烯合成的抑制无关,而可能与乙烯作用有关。