Changing root system architecture through inhibition of putrescine and feruloyl putrescine accumulation

Plant roots provide anchorage and absorb the water and minerals necessary for photosynthesis in the aerial parts of the plant. Since plants are sessile organisms, their root systems must forage for resources in heterogeneous soils through differential branching and elongation [(1988) Funct. Ecol. 2,...

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Bibliographic Details
Published in:FEBS letters 1994-04, Vol.342 (2), p.145-148
Main Authors: Ben-Hayyim, Gozal, Damon, Jean-Pierre, Martin-Tanguy, Josette, Tepfer, D.
Format: Article
Language:English
Subjects:
Agrobacterium rhizogenes
Biological and medical sciences
Cellular Biology
Chemical agents
Coumaric Acids - metabolism
DFMO
Eflornithine - pharmacology
Fundamental and applied biological sciences. Psychology
Genes, Plant
Life Sciences
Models, Biological
Nicotiana - genetics
Nicotiana - growth & development
Nicotiana - metabolism
Plant physiology and development
Plants, Genetically Modified
Plants, Toxic
Polyamine
Putrescine - analogs & derivatives
Putrescine - metabolism
Rhizobium - genetics
Ri TL-DNA
rolA
Root development
Transformation, Genetic
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:Plant roots provide anchorage and absorb the water and minerals necessary for photosynthesis in the aerial parts of the plant. Since plants are sessile organisms, their root systems must forage for resources in heterogeneous soils through differential branching and elongation [(1988) Funct. Ecol. 2, 345-351; (1991) Plant Roots: The Hidden Half, pp. 3-25, Marcel Dekker, NY]. Adaptation to drought, for instance, can be facilitated by increased root growth and penetration. Root systems thus develop as a function of environmental variables and the needs of the plant [(1988) Funct. Ecol. 2, 345-351; (1986) Bot. Gaz. 147, 137-147; (1991) Plant Roots: The Hidden Half, pp. 309-330, Marcel Dekker, NY], We show, in a model system consisting of excised tobacco roots, that both α- dl-difluoromethylornithine (an inhibitor of putrescine biosynthesis) and the rolA gene (from the root-inducing transferred DNA of Agrobacterium rhizogenes) stimulate overall root growth and cause a conversion in the pattern of root system formation, producing a dominant or ‘tap’ root. These morphological changes are correlated with a depression in the accumulation of polyamines and their conjugates.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(94)80489-3