Regulation of root growth by gibberellin in Lemna minor.
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TLDR
Results suggested that root growth in L. minor is regulated by endogenous gibberellin, especially in epidermal cells, which are affected by inhibition of cell division.Abstract:
Hormonal control of root growth was studied in Lemna minor. Although addition of gibberellic acid (GA3) to the culture medium did not promote the root growth, a gibberellin biosynthesis inhibitor, uniconazole P (Un-P), significantly inhibited root growth. Both length and diameter of roots in Un-P-treated plants were significantly smaller than those in control plants, mainly caused by inhibition of cell division. In epidermal cells, the length was slightly decreased and the width increased by Un-P treatment, indicating inhibition of elongation growth. GA3 completely nullified the inhibition caused by Un-P. Transverse cortical microtubules (CMTs) of epidermal cells in the elongation zone were significantly fragmented by treatment with Un-P, but not by that in the presence of GA3. The cellulose microfibril array in the Un-P-treated cells was more random and more oblique than that in the control cells. These results suggested that root growth in L. minor is regulated by endogenous gibberellin.read more
Citations
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On the alignment of cellulose microfibrils by cortical microtubules: a review and a model.
TL;DR: A model is presented that postulates that the nascent microfibril is incorporated into the cell wall by binding to a scaffold that is oriented; further, the scaffold is built and oriented around either already incorporatedmicrofibrils or plasma membrane proteins, or both.
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Regulation of Root Growth by Plant Hormones—Roles for Auxin and Gibberellin
TL;DR: The classical views of root-growth regulation by auxin and gibberellin are summarized and current theory of the regulation mechanism is described in this review, which focuses on the concentration-dependent deceleration of root growth.
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OsGSR1 is involved in crosstalk between gibberellins and brassinosteroids in rice.
Li Wang,Zhen Wang,Yunyuan Xu,Se-Hwan Joo,Seong-Ki Kim,Zhen Xue,Zhihong Xu,Zhi-Yong Wang,Zhi-Yong Wang,Kang Chong +9 more
TL;DR: OsGSR1 RNAi plants show a reduced sensitivity to GA treatment, an increased expression of the GA biosynthetic gene OsGA20ox2, which is feedback inhibited by GA signaling, and an elevated level of endogenous GA, which suggest that OsGSR 1 is a positive regulator of GA signaling.
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Brassinazole, an inhibitor of brassinosteroid biosynthesis, inhibits development of secondary xylem in cress plants (Lepidium sativum).
TL;DR: Cress plants grown in medium containing Brz exhibited a slight predominance of phloem differentiation at the expense of Xylem differentiation and remarkable inhibition of the development of secondary xylem, indicating that brassinosteroids function in xyleM development in vivo.
Journal ArticleDOI
Regulation of Elongation Growth by Gibberellin in Root Segments of Lemna minor
Sayaka Inada,Teruo Shimmen +1 more
TL;DR: In the epidermis, cell elongation was inhibited, but lateral cell expansion was not affected by uniconazole-P, and the inhibitory effect was completely nullified by GA3, suggesting that endogenous gibberellin controls the elongation growth of root by regulating cell elongations.
References
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Brassinosteroids Rescue the Deficiency of CYP90, a Cytochrome P450, Controlling Cell Elongation and De-etiolation in Arabidopsis
Miklós Szekeres,Kinga Németh,Zsuzsanna Koncz-Kalman,Jaideep Mathur,Annette Kauschmann,Thomas Altmann,George P. Rédei,Ferenc Nagy,Jeff Schell,Csaba Koncz,Csaba Koncz +10 more
TL;DR: Brassinosteroids compensate for different cell elongation defects of Arabidopsis det, cop, fus, and axr2 mutants, indicating that these steroids play an essential role in the regulation of plant development.
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A role for brassinosteroids in light-dependent development of Arabidopsis
TL;DR: The Arabidopsis DET2 gene encodes a protein that shares significant sequence identity with mammalian steroid 5α-reductases, and brassinosteroids may constitute a distinct class of phytohormones with an important role in light-regulated development of higher plants.
Journal ArticleDOI
Gibberellins : perception, transduction and responses
TL;DR: As the understanding of GA-regulated events in aleurone cells has advanced through molecular and cell biology approaches, other GA-responsive plant tissues have also proved to be tractible for studying GA-action.
Journal ArticleDOI
Blockage of Brassinosteroid Biosynthesis and Sensitivity Causes Dwarfism in Garden Pea.
TL;DR: The findings indicate that the lkb plants are BR-deficient mutants, probably as a consequence of a block in the BR biosynthetic pathway prior to the production of teasterone.
Journal ArticleDOI
Genetic Dissection of the Relative Roles of Auxin and Gibberellin in the Regulation of Stem Elongation in Intact Light-Grown Peas.
TL;DR: Because lkb plants contain low levels of IAA, growth suppression in dwarf lkb mutants seems to be due to a deficiency in endogenous auxin, and the effect of GA may, in part, be mediated by auxin.
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