Antibodies to ABP1 blockauxin-induced proton efflux in protoplasts.
If overall speculative role is true, what should auxin exogenous treatment produce?
AUXIN BIOSYNTHESIS | Annual Review of Plant Biology
Auxins are also involved in gravitropisms. In a root placed horizontally, the bottom side contains more auxin than the top side. This makes the bottom side grow less than the top side, causing the root to bend in the direction of the force of gravity.
Auxin changes carbon dioxide Levels in the Leaf. 116 Why this makes sense - increased respiration induced by auxin raises oxygen levels. Through this mechanism oxygen may regulate respiration and photosynthesis.
The pathway of auxin biosynthesis in plants - OUP …
Injury from high concentrations of Auxin Inhibitors may change fruit size, shape, and appearance or cause abortion of fruits. Slight auxin herbicide symptoms, however, may have no effect on fruit maturity. Exposure to high concentrations of auxin herbicides may also delay fruit ripening when plants are severely affected. For example, delayed maturity from exposure to high 2,4-D concentrations may exist in a grapevine for one to three years before normal ripening returns.
Along with cytokinin and JA and Salicylic acid, IAA should be necessary for cell division. If there are some plant callus lines that will divide with only auxin and cytokinin present it is because these cell lines are mutants that produce SA and JA natively. Alternatively these latter two hormones are unknowingly being included with "other" nutrients/vitamins that are also added to calluses to get them to divide.
The pathway of auxin biosynthesis in plants Yoshihiro Mano
Auxin is an important plant hormone that controls numerous aspects of development and physiology, including responses to light, tissue patterning, and organogenesis. It forms concentration gradients across various tissues throughout the plant and exerts its effects by binding to auxin binding proteins and regulating transcription of distinct sets of target genes.
Other auxins that have been isolated from plantsinclude indole ethanol, indole acetaldehyde, indole acetonitrile, phenylacetic acid(PAA),and 4-chloro-indoleacetic acid.
Plant Hormones | Auxin | Plant Hormone
- the major natural auxin in plants is ..
Naturally Occurring Auxins The most importantauxin found in plants is indole-3-acetic acid (IAA).
Chapter 8 - Plant Hormones | Auxin | Plant Hormone
And as native auxin, its stability is controlled in many ways in plants, from synthesis, ..
New Insights into Auxin Biosynthesis | Plant Cell
only under specific conditions will auxin synthesis be activated in them).
Lack of the plant hormone auxin can ..
Injury Symptoms: Most auxin herbicides cause similar injury symptoms, but symptom intensity and appearance depend on the herbicide, level of exposure, growth stage, crops, and environmental conditions. In general, trees and shrubs are less sensitive than susceptible annual plants. In addition, younger plants are more susceptible to Auxin Inhibitors than mature plants. Symptoms may range from slight, at low exposure, to severe or death from high levels of exposure. Initial symptoms are twisting, leaf curling, and cupping, which may occur within hours of exposure. Leaves that are not fully expanded at the time of exposure may be stunted and distorted. A few days after exposure, general chlorosis may develop at high exposure levels. Leaves will drop and shoot tips may die, followed by stem dieback in trees and vines. Growth may resume depending on the level of exposure. Regrowth is sometimes limited to buds on the lower part of the plants. Regrowth may exhibit severe shoot and petiole twisting, leaf cupping, stunting, curling, strapping, feathering, roughness, crinkling of the leaf surface, vein discoloration, and fingering of the leaf margins. Auxin herbicides may inhibit interveinal tissue growth making veins appear to be joined together and extended to form finger-like projections. In trees, ornamental shrubs, and grapevines, symptoms may continue to appear until the end of the growing season. In grapevines, 2,4-D symptoms from high concentrations may continue to appear in the second year after exposure. Severely injured grapevines may not recover for two years or more. Furthermore, high concentrations of Auxin Inhibitors may cause stem cracking or dark reddish coloring. Stem elongation of plants may be enhanced (at low concentrations) or inhibited (at high concentrations) by growth Auxin Inhibitors.
The most common auxin found in plants is ..
Written and edited by experts in the field, this collection from describes the numerous processes auxin controls. These include growth of the shoot apical meristem, leaf and vein patterning, and flower, fruit, and root development. Other chapters examine how auxin is synthesized by plants, the nature of auxin receptors, the Aux/IAA family of transcriptional repressors that auxin regulates, and the variety of auxin transport mechanisms that exist in plants.
The main auxin biosynthesis pathway in Arabidopsis
The book also examines the extraordinary complexity of auxin responses and discusses new computational models for mechanisms that allow this hormone to generate such a wide variety of outputs. It is thus of interest to systems biologists, biochemists, and developmental biologists, as well as all plant biologists interested in the regulation of plant behavior and morphogenesis.
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