Requirement of the Auxin Polar Transport System in Early Stages of Arabidopsis Floral Bud Formation

1991 ◽  
Vol 3 (7) ◽  
pp. 677 ◽  
Author(s):  
Kiyotaka Okada ◽  
Junichi Ueda ◽  
Masako K. Komaki ◽  
Callum J. Bell ◽  
Yoshiro Shimura
Keyword(s):  
Transport System ◽  
Polar Transport ◽  
Bud Formation ◽  
Early Stages ◽  
Auxin Polar Transport ◽  
Floral Bud

scholarly journals Requirement of the Auxin Polar Transport System in Early Stages of Arabidopsis Floral Bud Formation.

1991 ◽  
pp. 677-684 ◽  
Author(s):  
K. Okada ◽  
J. Ueda ◽  
M. K. Komaki ◽  
C. J. Bell ◽  
Y. Shimura
Keyword(s):  
Transport System ◽  
Polar Transport ◽  
Bud Formation ◽  
Early Stages ◽  
Auxin Polar Transport ◽  
Floral Bud

The Transport Behaviour of the Synthetic Auxin 2,4-Dichlorophenoxyacetic Acid in Decapitated Seedlings of Sunflower (Helianthus annuus L.)

1982 ◽  
Vol 9 (1) ◽  
pp. 5 ◽  
Author(s):  
BT Brown ◽  
JN Phillips
Keyword(s):  
Transport System ◽  
Apical Dominance ◽  
Transport Process ◽  
Dichlorophenoxyacetic Acid ◽  
Loading Capacity ◽  
Polar Transport ◽  
Synthetic Auxin ◽  
Transport Behaviour ◽  
Auxin Polar Transport ◽  
2,4 Dichlorophenoxyacetic Acid

The transport behaviour of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D), applied in aqueous solution to the cut stem surface of sunflower seedlings decapitated in the epicotyl, was studied using steam-ringing to differentiate between apoplastic and symplastic movement. Initially the 2,4-D moved in apoplastic tissue and was distributed rapidly throughout the plant, apparently as the result of a non-auxin-specific transport process. When an amount of 2,4-D sufficient to maintain apical dominance in the decapitated seedling was applied, the initially distributed material was subsequently redistributed acropetally in the stem apoplast and accumulated in the stump apex. When a lower level of 2,4-D, insufficient to maintain apical dominance, was applied, the initially distributed material was redistributed basipetally in the stem symplast, probably via the auxin polar transport system, and accumulated in the root. It is suggested that the 2,4-D loading capacity of the polar transport system is an important factor determining both the transport behaviour of the 2,4-D and its ability to maintain apical dominance in this system.

scholarly journals IAA in the control of photoperiodic flower induction of Pharbitis nil chois

2014 ◽  
Vol 64 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Halina Kulikowska-Gulewska ◽  
Mariusz Cymerski ◽  
Joanna Czaplewska ◽  
Jan Kopcewicz
Keyword(s):  
Shoot Apex ◽  
Dark Period ◽  
Floral Induction ◽  
Pharbitis Nil ◽  
Flower Bud ◽  
Long Distance ◽  
Polar Transport ◽  
Bud Formation ◽  
Flower Bud Formation ◽  
Auxin Polar Transport

The endogenous content of IAA in the cotyledons of <i>Pharbitis nil</i> is low before and during the first half of the inductive 16-h-long dark period. From the 8th to the 12th hour the level of IAA increased and then again was going down at the end of a dark period. Exogenous IAA applied to the cotyledones before and during the first half of the inductive dark period inhibits flower bud formation. The application of IAA to shoot apex also resulted in the inhibition of flowering. Experiments with TIBA, an auxin polar transport inhibitor, and PCIB, an auxin action inhibitor, have shown that auxin polar transport in cotyledones and long-distance auxin transport from cotyledones to shoot apex play an important role in IAA inhibition of flower bud formation. It suggests that auxins play their role not only at the level of floral induction in cotyledones, but also in the later events of floral evocation and differentiation in shoot apex.

Identification of dehydrocostus lactone and 4-hydroxy-β-thujone as auxin polar transport inhibitors

2013 ◽  
Vol 35 (7) ◽  
pp. 2251-2258 ◽  
Author(s):  
Junichi Ueda ◽  
Yuta Toda ◽  
Kiyotaka Kato ◽  
Yuichi Kuroda ◽  
Tsukasa Arai ◽  
...  
Keyword(s):  
Polar Transport ◽  
Transport Inhibitors ◽  
Auxin Polar Transport ◽  
Dehydrocostus Lactone

scholarly journals Auxin minimum triggers the developmental switch from cell division to cell differentiation in the Arabidopsis root

2017 ◽  
Vol 114 (36) ◽  
pp. E7641-E7649 ◽  
Author(s):  
Riccardo Di Mambro ◽  
Micol De Ruvo ◽  
Elena Pacifici ◽  
Elena Salvi ◽  
Rosangela Sozzani ◽  
...  
Keyword(s):  
Cell Division ◽  
Auxin Transport ◽  
Positional Information ◽  
Polar Auxin Transport ◽  
Arabidopsis Root ◽  
Polar Transport ◽  
Stringent Control ◽  
Auxin Polar Transport ◽  
Multicellular Organisms ◽  
Developmental Switch

In multicellular organisms, a stringent control of the transition between cell division and differentiation is crucial for correct tissue and organ development. In the Arabidopsis root, the boundary between dividing and differentiating cells is positioned by the antagonistic interaction of the hormones auxin and cytokinin. Cytokinin affects polar auxin transport, but how this impacts the positional information required to establish this tissue boundary, is still unknown. By combining computational modeling with molecular genetics, we show that boundary formation is dependent on cytokinin’s control on auxin polar transport and degradation. The regulation of both processes shapes the auxin profile in a well-defined auxin minimum. This auxin minimum positions the boundary between dividing and differentiating cells, acting as a trigger for this developmental transition, thus controlling meristem size.

scholarly journals Suitable Experimental Design for Determination of Auxin Polar Transport in Space Using a Spacecraft.

2000 ◽  
Vol 14 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Toru Shimazu ◽  
Kensuke Miyamoto ◽  
Takayuki Hoson ◽  
Seiichiro Kamisaka ◽  
Junichi Ueda
Keyword(s):  
Experimental Design ◽  
Polar Transport ◽  
Auxin Polar Transport
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