scholarly journals The Role of PIN Auxin Efflux Carriers in Polar Auxin Transport and Accumulation and Their Effect on Shaping Maize Development

2012 ◽  
Vol 5 (4) ◽  
pp. 787-798 ◽  
Author(s):  
Cristian Forestan ◽  
Serena Varotto
Keyword(s):  
Auxin Transport ◽  
Polar Auxin Transport ◽  
Auxin Efflux Carriers

scholarly journals Ethylene Does Not Promote Adventitious Root Initiation on Apple Microcuttings

1996 ◽  
Vol 121 (5) ◽  
pp. 880-885 ◽  
Author(s):  
James F. Harbage ◽  
Dennis P. Stimart
Keyword(s):  
Carboxylic Acid ◽  
Auxin Transport ◽  
Adventitious Rooting ◽  
Polar Auxin Transport ◽  
Root Initiation ◽  
Ethylene Evolution ◽  
Basal Section ◽  
Naphthylphthalamic Acid ◽  
Transport Inhibitors

We investigated the role of ethylene on adventitious rooting of `Gala' (easy-to-root) and `Triple Red Delicious' (difficult-to-root) apple (Malus domestica Borkh.) microcuttings. Root count increased significantly as IBA level increased, with highest root counts on `Gala'. Ethylene evolution increased significantly with IBA level without significant differences between cultivars. Basal section removal of microcuttings in the area of root origin reduced root count without changing ethylene evolution. Ethylene treatment of proliferated shoots before microcutting excision failed to enhance rooting. IBA-induced ethylene evolution was eliminated nearly by AVG, but root count remained IBA dependent. ACC reversed IBA plus AVG rooting inhibition, but ACC alone failed to influence root count. Polar auxin transport inhibitors NPA and TIBA stimulated ethylene evolution without increasing root count. Adventitious rooting of apple microcuttings was not associated with ethylene. Chemical names used: 1-H-indole-3-butyric acid (IBA); aminoethoxyvinylglycine (AVG); 1-aminocyclopropane-1-carboxylic acid (ACC); 2,3,5-triiodobenzoic acid (TIBA); N-1-naphthylphthalamic acid (NPA).

scholarly journals The role of Arabidopsis Actin-Related Protein 3 in amyloplast sedimentation and polar auxin transport in root gravitropism

2016 ◽  
Vol 67 (18) ◽  
pp. 5325-5337 ◽  
Author(s):  
Jun-Jie Zou ◽  
Zhong-Yu Zheng ◽  
Shan Xue ◽  
Han-Hai Li ◽  
Yu-Ren Wang ◽  
...  
Keyword(s):  
Auxin Transport ◽  
Polar Auxin Transport ◽  
Related Protein ◽  
Root Gravitropism

Auxin and ETTIN in Arabidopsis gynoecium morphogenesis

Development ◽  
2000 ◽  
Vol 127 (18) ◽  
pp. 3877-3888 ◽  
Author(s):  
J.L. Nemhauser ◽  
L.J. Feldman ◽  
P.C. Zambryski
Keyword(s):  
Auxin Transport ◽  
Floral Organ ◽  
Polar Auxin Transport ◽  
Auxin Response ◽  
Auxin Transport Inhibitor ◽  
Increased Sensitivity ◽  
Auxin Flux ◽  
Naphthylphthalamic Acid

The phytohormone auxin has wide-ranging effects on growth and development. Genetic and physiological approaches implicate auxin flux in determination of floral organ number and patterning. This study uses a novel technique of transiently applying a polar auxin transport inhibitor, N-1-naphthylphthalamic acid (NPA), to developing Arabidopsis flowers to further characterize the role of auxin in organogenesis. NPA has marked effects on floral organ number as well as on regional specification in wild-type gynoecia, as defined by morphological and histological landmarks for regional boundaries, as well as tissue-specific reporter lines. NPA's effects on gynoecium patterning mimic the phenotype of mutations in ETTIN, a member of the auxin response factor family of transcription factors. In addition, application of different concentrations of NPA reveal an increased sensitivity of weak ettin alleles to disruptions in polar auxin transport. In contrast, the defects found in spatula gynoecia are partially rescued by treatment with NPA. A model is proposed suggesting an apical-basal gradient of auxin during gynoecium development. This model provides a mechanism linking ETTIN's putative transcriptional regulation of auxin-responsive genes to the establishment or elaboration of tissue patterning during gynoecial development.

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