Control of internode length in Pisum sativum

The effects of altered endogenous indole-3-acetic (IAA) levels on elongation in garden pea (Pisum sativum L.) plants were investigated. The auxin transport inhibitors 2,3,5-triiodobenzoic acid (TIBA) and 9-hydroxyfluorene-9-carboxylic acid (HFCA) were applied to elongating internodes of wild-type an...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1994-12, Vol.106 (4), p.1521-1526
Main Authors: McKay, M.J. (University of Tasmania, Tasmania, Australia), Ross, J.J, Lawrence, N.L, Cramp, R.E, Beveridge, C.A, Reid, J.B
Format: Article
Language:English
Subjects:
2,4-D
ACIDE INDOLACETIQUE
ACIDE ORGANIQUE
ACIDE TRIODOBENZOIQUE
ACIDO INDOLACETICO
ACIDO TRIODOBENZOICO
ACIDOS ORGANICOS
CRECIMIENTO
CROISSANCE
ENTRE NOEUD
FENOTIPOS
FEUILLE
GENOTIPOS
GENOTYPE
HOJAS
INTERNODIOS
LARGURA
LONGUEUR
MUTANT
MUTANTES
PHENOTYPE
PISUM SATIVUM
TALLO
TIGE
VARIACION GENETICA
VARIATION GENETIQUE
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Summary:The effects of altered endogenous indole-3-acetic (IAA) levels on elongation in garden pea (Pisum sativum L.) plants were investigated. The auxin transport inhibitors 2,3,5-triiodobenzoic acid (TIBA) and 9-hydroxyfluorene-9-carboxylic acid (HFCA) were applied to elongating internodes of wild-type and mutant lkb plants. The lkb mutant was included because elongating lkb internodes contained 2- to 3-fold less free IAA than those of the wild type. In the wild type, TIBA reduced both the IAA level and internode elongation below the site of application. Both TIBA and HFCA strongly promoted the elongation of lkb internodes and also raised IAA levels above the application site. The synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) also markedly increased internode elongation in lkb plants and virtually restored petioles and tendrils to their wild-type length. In contrast, treatment of wild-type plants with TIBA, HFCA, or 2,4-D caused little or no increase in elongation above the application site. The ethylene synthesis inhibitor aminoethoxyvinylglycine also increased stem elongation in lkb plants, and combined application of HFCA and aminoethoxyvinylglycine restored lkb internodes to the wild-type length. It is concluded that the level of IAA in wild-type internodes is necessary for normal elongation, and that the reduced stature of lkb plants is at least partially attributable to a reduction in free IAA level in this mutant
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.106.4.1521