PMID: 11925033Apr 2, 2002Paper

An auxin surge following fertilization in carrots: a mechanism for regulating plant totipotency

Planta
David M RibnickyTodd J Cooke

Abstract

All plants exhibit the property of cellular totipotency, whereby individual cells can regenerate into an entire organism. However little is known about the underlying mechanisms regulating totipotency. Using a preparative microtechnique, we report an 80-fold surge in the concentration of free auxin that is correlated with the initial stages of zygotic embryogenesis in carrots. The concentration of free IAA increases from a basal level of ca. 25 ng/g FW in unfertilized ovules to ca. 2.000 ng/g FW in the late globular and early heart stages, then back to the basal level in the torpedo stage. This initial increase in IAA levels is diagnostic of the activity of the tryptophan-mediated pathway for IAA biosynthesis, while the maintenance of the basal levels is attributed to the tryptophan-independent pathway for IAA biosynthesis. Our observations are consistent with the hypothesis that the sequential activation of alternative IAA biosynthetic pathways is a critical mechanism for regulating carrot (Daucus carota L. cv. Danvers 126) embryogenesis and other instances of plant totipotency.

Citations

Jan 5, 2012·Analytical and Bioanalytical Chemistry·Fuyou DuHuwei Liu
Feb 26, 2010·Cold Spring Harbor Perspectives in Biology·Jennifer Normanly
Dec 26, 2015·Analytica Chimica Acta·Sara PorfírioParastoo Azadi
Dec 7, 2007·Plant Physiology and Biochemistry : PPB·Mariette BedhommeYves Henry
Oct 15, 2014·Plant, Cell & Environment·Heming ZhaoJie Zhao
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Apr 11, 2003·Journal of Plant Physiology·Yoshihiko Tokuji, Kyoko Kuriyama
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Aug 10, 2013·Dose-response : a Publication of International Hormesis Society·Egil Fosslien
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Mar 4, 2017·Plant Cell Reports·Barbara Wójcikowska, Małgorzata D Gaj
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Jun 6, 2003·Plant Cell Reports·E Zazimalova, R M Napier
Dec 4, 2021·Journal, Genetic Engineering & Biotechnology·Seunghye ParkSe-Hwan Joo

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