Auxin: Regulation and its modulation pathways

2013 ◽  
Vol 3 (6) ◽  
pp. 423-430 ◽  
Author(s):  
S. M. Rozov ◽  
A. A. Zagorskaya ◽  
E. V. Deineko ◽  
V. K. Shumny
Keyword(s):  
Auxin Regulation

Auxin regulation of gibberellin biosynthesis in the roots of pea (Pisum sativum)

2009 ◽  
Vol 36 (4) ◽  
pp. 362 ◽  
Author(s):  
Diana E. Weston ◽  
James B. Reid ◽  
John J. Ross
Keyword(s):  
Pisum Sativum ◽  
Inhibitory Effect ◽  
Gibberellin Biosynthesis ◽  
Growth Inhibitory ◽  
Auxin Regulation ◽  
Auxin Transport Inhibitor ◽  
Naphthylphthalamic Acid ◽  
Pea Roots ◽  
High Auxin ◽  
Ga Biosynthesis

Auxin promotes GA biosynthesis in the aboveground parts of plants. However, it has not been demonstrated previously that this interaction occurs in roots. To understand the interactions between auxin and GAs in these organs, we treated wild-type pea (Pisum sativum L.) roots with the inhibitors of auxin action, p-chlorophenoxyisobutyric acid (PCIB) and yokonolide B (YkB), and with the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA). These compounds generally downregulated GA synthesis genes and upregulated GA deactivation genes, and reduced the level of the bioactive GA1. These effects indicate that in pea roots, auxin at normal endogenous levels stimulates GA biosynthesis. We show also that supra-optimal levels of exogenous auxin reduce the endogenous level of bioactive GA in roots, although the effect appears too small to account for the strong growth-inhibitory effect of high auxin levels.

scholarly journals Hypocotyl Transcriptome Reveals Auxin Regulation of Growth-Promoting Genes through GA-Dependent and -Independent Pathways

PLoS ONE ◽  
2012 ◽  
Vol 7 (5) ◽  
pp. e36210 ◽  
Author(s):  
Elisabeth J. Chapman ◽  
Kathleen Greenham ◽  
Cristina Castillejo ◽  
Ryan Sartor ◽  
Agniezska Bialy ◽  
...  
Keyword(s):  
Auxin Regulation ◽  
Growth Promoting ◽  
Regulation Of Growth

Auxin Regulation of Flower Bud Formation in Tobacco Explants

1988 ◽  
Vol 39 (4) ◽  
pp. 451-459 ◽  
Author(s):  
M. J. M. SMULDERS ◽  
G. F. E. JANSSEN ◽  
A. F. CROES ◽  
G. W. M. BARENDSE ◽  
G. J. WULLEMS
Keyword(s):  
Flower Bud ◽  
Bud Formation ◽  
Auxin Regulation ◽  
Flower Bud Formation

scholarly journals Seasonal variation of auxin in stem cambial region of Pinus sihestris L.

2015 ◽  
Vol 47 (3) ◽  
pp. 225-231 ◽  
Author(s):  
Tomasz J. Wodzicki
Keyword(s):  
Seasonal Variation ◽  
Cambial Activity ◽  
Critical Discussion ◽  
Pinus Silvestris ◽  
Auxin Regulation ◽  
Concentration Changes

Investigation of auxin from the stem cambial region of adult <i>Pinus silvestris</i> trees by diffusion to agar, and by extraction revealed both seasonal variation and gradients along the stem. Variation in dynamics of auxin efflux and the effect of the size of tissue blocks are used as arguments in the critical discussion of the concept of auxin regulation of cambial activity by way of simple seasonal concentration changes.

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