Hormonal interplay during adventitious root formation in flooded tomato plants.
Soil flooding, which results in a decline in the availability of oxygen to submerged organs, negatively affects the growth and productivity of most crops. Although tomato (Solanum lycopersicum) is known for its sensitivity to waterlogging, its ability to produce adventitious roots (ARs) increases plant survival when the level of oxygen is decreased in the root zone. Ethylene entrapment by water may represent the first warning signal to the plant indicating waterlogging. We found that treatment with the ethylene biosynthesis inhibitor aminoethoxyvinylglycine (AVG) and the auxin transport inhibitor 1-naphthylphthalamic acid (NPA) resulted in a reduction of AR formation in waterlogged plants. We observed that ethylene, perceived by the Never Ripe receptor, stimulated auxin transport. In a process requiring the Diageotropica gene, auxin accumulation in the stem triggered additional ethylene synthesis, which further stimulated a flux of auxin towards to the flooded parts of the plant. Auxin accumulation in the base of the plant induces growth of pre-formed root initials. This response of tomato plants results in a new root system that is capable of replacing the original one when it has been damaged by submergence.
Vidoz
Maria Laura
ML
Plant Laboratory, Scuola Superiore Sant'Anna, Via Mariscoglio 34, 56124 Pisa, Italy.
Loreti
Elena
E
Mensuali
Anna
A
Alpi
Amedeo
A
Perata
Pierdomenico
P
D001692:Biological Transport / Q000187:drug effects; D005030:Ethylenes / Q000378:metabolism*; D055868:Floods; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005998:Glycine / Q000031:analogs & derivatives / Q000494:pharmacology; D007210:Indoleacetic Acids / Q000378:metabolism*; D018551:Solanum lycopersicum / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism / Q000494:pharmacology; D010797:Phthalimides / Q000494:pharmacology; D010937:Plant Growth Regulators / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D018547:Plant Stems / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012987:Soil / Q000032:analysis; D014867:Water / Q000378:metabolism / Q000494:pharmacology
D005030:Ethylenes; D007210:Indoleacetic Acids; D010797:Phthalimides; D010937:Plant Growth Regulators; D010940:Plant Proteins; D012987:Soil; D014867:Water; C002687:alpha-naphthylphthalamic acid; C088137:aminoethoxyvinylglycine; D010100:Oxygen; D005998:Glycine