scholarly journals Defective Long-Distance Auxin Transport Regulation in the Medicago truncatula super numeric nodules Mutant

2006 ◽  
Vol 140 (4) ◽  
pp. 1494-1506 ◽  
Author(s):  
Giel E. van Noorden ◽  
John J. Ross ◽  
James B. Reid ◽  
Barry G. Rolfe ◽  
Ulrike Mathesius
Keyword(s):  
Medicago Truncatula ◽  
Auxin Transport ◽  
Long Distance ◽  
Transport Regulation

Regulation of Nodule Development by Short- and Long-Distance Auxin Transport Control

2015 ◽  
pp. 465-474 ◽  
Author(s):  
Ulrike Mathesius ◽  
Jian Jin ◽  
Giel E. Noorden ◽  
Liang P. J. Ng ◽  
Anton P. Wasson
Keyword(s):  
Auxin Transport ◽  
Nodule Development ◽  
Long Distance ◽  
Transport Control

scholarly journals Photoreceptors Regulate Plant Developmental Plasticity through Auxin

Plants ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 940 ◽  
Author(s):  
Jesse J. Küpers ◽  
Lisa Oskam ◽  
Ronald Pierik
Keyword(s):  
Developmental Plasticity ◽  
Auxin Transport ◽  
Green Light ◽  
Direct Interaction ◽  
Target Cells ◽  
Resistance Locus ◽  
Long Distance ◽  
Response Factors ◽  
Auxin Response Factors ◽  
Auxin Signalling

Light absorption by plants changes the composition of light inside vegetation. Blue (B) and red (R) light are used for photosynthesis whereas far-red (FR) and green light are reflected. A combination of UV-B, blue and R:FR-responsive photoreceptors collectively measures the light and temperature environment and adjusts plant development accordingly. This developmental plasticity to photoreceptor signals is largely regulated through the phytohormone auxin. The phytochrome, cryptochrome and UV Resistance Locus 8 (UVR8) photoreceptors are inactivated in shade and/or elevated temperature, which releases their repression of Phytochrome Interacting Factor (PIF) transcription factors. Active PIFs stimulate auxin synthesis and reinforce auxin signalling responses through direct interaction with Auxin Response Factors (ARFs). It was recently discovered that shade-induced hypocotyl elongation and petiole hyponasty depend on long-distance auxin transport towards target cells from the cotyledon and leaf tip, respectively. Other responses, such as phototropic bending, are regulated by auxin transport and signalling across only a few cell layers. In addition, photoreceptors can directly interact with components in the auxin signalling pathway, such as Auxin/Indole Acetic Acids (AUX/IAAs) and ARFs. Here we will discuss the complex interactions between photoreceptor and auxin signalling, addressing both mechanisms and consequences of these highly interconnected pathways.

scholarly journals An Emerging Model of Auxin Transport Regulation

2002 ◽  
Vol 14 (2) ◽  
pp. 293-299 ◽  
Author(s):  
Gloria K. Muday ◽  
Angus S. Murphy
Keyword(s):  
Auxin Transport ◽  
Transport Regulation

Xylogénèse chez les Dicotylédones arborescentes. IV. Influence des bourgeons, de l'acide (β-indolyl acétique et de l'acide gibberellique sur la réactivation cambiale et la xylogénèse dans les jeunes tiges de Hêtre

1983 ◽  
Vol 61 (6) ◽  
pp. 1768-1774 ◽  
Author(s):  
Suzanne Lachaud
Keyword(s):  
Transport System ◽  
Short Distance ◽  
Auxin Transport ◽  
Cambial Activity ◽  
Long Distance ◽  
Cambial Reactivation

The application, in the middle of April, of a mixture of IAA (10−4 M) and GA3 (10−4 M), to apical stem of young beeches, disbudded more than 1 month ago, brings about the formation of an unusual early wood, composed of small xylary elements only, on a short distance. If the phytohormones are applied immediately on the following day after disbudding, the young trees produce normal early wood, on a long distance. GA3 applied alone has hardly any effect on cambial reactivation; IAA applied alone stimulates less cambial reactivation and xylogenesis than the mixture of IAA and GA3. The study of [3H]-IAA transport in apical shoots of the same trees shows that beeches disbudded 1 month ago have lost the ability to activate the auxin transport. Disbudding, carried out in the middle or at the end of the preactivation phase, affects the IAA transport system within a few days; a further exogenous phytohormone application cannot then replace buds and promote the renewal of cambial activity. In young beeches, the resumption of tissue ability to polarize the auxin transport, which in February characterizes the beginning of the preactivation phase, depends on buds; the maintenance and development of this ability are related to their presence.

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