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Evolutionary patterns in auxin action
- T. Cooke, Dorothybelle Poli, A. Sztein, Jerry D Cohen
- Biology, MedicinePlant Molecular Biology
- 27 May 2002
The seed plants did not evolve de novo mechanisms for mediating IAA responses, but have rather modified pre-existing mechanisms already operating in the early land plants.
Auxin levels at different stages of carrot somatic embryogenesis
The present results suggest that high IAA levels may be necessary but are not sufficient for the initial events in plant embryogenesis, whereas low IAA Levels are associated with the later stages of embryo development.
Regulation of indole-3-acetic Acid biosynthetic pathways in carrot cell cultures.
2,4-Dichlorophenoxyacetic acid (2,4-D) promotes the accumulation of tryptophan-derived indole-3-acetic acid (IAA) in carrot cell cultures during callus proliferation by a biosynthetic pathway that is…
Evolutionary Patterns in the Auxin Metabolism of Green Plants
The general class of the IAA biosynthetic pathway operating in the vegetative apices of the liverwort Pallavicinia lyellii, the moss Polytrichum ohioense, and the pteridophyte Selaginella kraussiana is established.
Auxin metabolism in mosses and liverworts.
- A. Ester Sztein, J. Cohen, I. de la Fuente, T. Cooke
- Biology, MedicineAmerican journal of botany
- 1 November 1999
It is suggested that the liverworts appear to employ a biosynthesis-degradation strategy for the regulation of free IAA levels, in contrast to the conjugation-hydrolysis strategy apparently used by the mosses and tracheophytes.
Auxin regulation of axial growth in bryophyte sporophytes: its potential significance for the evolution of early land plants.
The three lineages of extant bryophytes appear to have evolved independent innovations for auxin regulation of axial growth, with similar mechanisms operating in moss sporophytes and vascular plants.
Unusual patterns of somatic embryogenesis in the domesticated carrot: developmental effects of exogenous auxins and auxin transport inhibitors.
The effects of various exogenous auxins and polar auxin transport inhibitors on somatic embryogenesis in carrot cultures were investigated and shed light on the role of auxin and its polar transport in somatics embryogenesis.
Fundamental Concepts in the Embryogenesis of Dicotyledons: A Morphological Interpretation of Embryo Mutants.
It is demonstrated that it is the morphology of the embryo that determines the cell lineage patterns rather than vice versa in plant embryos.
The Effects of Exogenous Auxins on Endogenous Indole-3-Acetic Acid Metabolism (The Implications for Carrot Somatic Embryogenesis)
Indole-3-acetic acid was synthesized for this purpose, thus extending the range of auxins that can be assayed by stable-isotope techniques, and promoted callus proliferation and the resulting callus became organogenic, producing both roots and shoots.
An auxin surge following fertilization in carrots: a mechanism for regulating plant totipotency
Using a preparative microtechnique, an 80-fold surge in the concentration of free auxin is reported that is correlated with the initial stages of zygotic embryogenesis in carrots, consistent with the hypothesis that the sequential activation of alternative IAA biosynthetic pathways is a critical mechanism for regulating carrot embryogenesis.