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The response to auxin of rapeseed (Brassica napus L.) roots displaying reduced gravitropism due to transformation by Agrobacterium rhizogenes
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The response to auxin of rapeseed (Brassica napus L.) roots displaying reduced gravitropism due to transformation by Agrobacterium rhizogenes
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The response to auxin of rapeseed (Brassica napus L.) roots displaying reduced gravitropism due to transformation by Agrobacterium rhizogenes
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Journal Article
The response to auxin of rapeseed (Brassica napus L.) roots displaying reduced gravitropism due to transformation by Agrobacterium rhizogenes
1996
Overview
It has recently been documented that, compared to untransformed controls, the roots of oilseed rape (Brassica napus L. CV CrGC5) seedlings transformed by Agrobacterium rhizogenes A4 show a reduced gravitropic reaction (Legué et al. 1994, Physiol Plant 91: 559—566). After stimulation at 90°C or 135°, the transformed root tips curve, but never reach a vertical orientation. In the present study, we investigated the causes of reduced gravitropic bending observed in stimulated transformed root tips. First, we localized the gravitropic curvature in normal and in transformed roots after 1.5 h of stimulation. The cells involved in root curvature (target cells) corresponded at the cellular level to the apical part of the zone of increasing cell length. In transformed roots grown in the vertical position, these cells showed a reduction in cell length compared to controls. Because auxin is considered to be the gravitropic mediator, the response of normal and transformed roots to exogenous auxin was studied. Indole-3-acetic acid (IAA) was applied along the first 3 mm using resin beads loaded with the hormone. In comparison to normal roots, transformed roots showed reduced bending toward the bead at all points of bead application. Moreover, the cells which responded to IAA corresponded to the target cells involved in the gravitropic reaction. The level of endogenous IAA was lower in transformed roots. Thus, it was concluded that the modified behavior of transformed roots during gravitropic stimulation could be due to differences either in IAA levels or in reactivity of the target cells to the message from the cap.
Publisher
Springer Verlag,HAL CCSD,Springer-Verlag,Springer
Subject
Agronomy. Soil science and plant productions
/ Auxins
/ Bending
/ Biological and medical sciences
/ Brassica
/ Brassica - growth & development
/ Corn
/ cytology
/ Fundamental and applied biological sciences. Psychology
/ Genetics
/ Indoleacetic Acids - metabolism
/ Indoleacetic Acids - pharmacokinetics
/ Plant Growth Regulators - metabolism
/ Plant Growth Regulators - pharmacokinetics
/ Plant physiology and development
/ Plant Root Cap - growth & development
/ Plant Roots - growth & development
/ Plants
