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4,4,4‐Trifluoro‐3‐(indole‐3‐)butyric acid promotes root elongation in Lactuca sativa independent of ethylene synthesis and pH
Author(s) -
Zhang Nenggang,
Hasenstein Karl H.
Publication year - 2002
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.2002.1160314.x
Subject(s) - ethylene , elongation , lactuca , hypocotyl , butyric acid , glycine , chemistry , indole test , biochemistry , botany , biology , amino acid , materials science , metallurgy , ultimate tensile strength , catalysis
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 µ M ) 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 ‐ α ‐(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.