Effect of an auxin transport inhibitor on aggregation and attachment processes during ectomycorrhiza formation between Laccaria bicolor S238N and Picea abies

2001 ◽  
Vol 79 (10) ◽  
pp. 1152-1160
Author(s):  
Ana Rincón ◽  
Joëlle Gérard ◽  
Jean Dexheimer ◽  
François Le Tacon
Keyword(s):  
Picea Abies ◽  
Auxin Transport ◽  
Protein Structures ◽  
Laccaria Bicolor ◽  
Transport Inhibitor ◽  
Transmission Electron ◽  
Auxin Transport Inhibitor ◽  
Host Effect ◽  
Indole 3 Acetic Acid ◽  
Attachment Process

Transmission electron microscopy observations performed with cytochemical stains to detect polysaccharides and cysteine-rich proteins have been done to study the effect of an auxin transport inhibitor (2,3,5-triiodobenzoic acid, TIBA) on Laccaria bicolor (Marie) Orton. hypha attachment and aggregation during mycorrhiza formation in Picea abies (L.) Karst. roots. When the two partners were growing separately without any exchange of information, TIBA did not affect the cell wall's polysaccharide or protein structures, which could play a role in the aggregation or attachment process. The presence of the host strongly increased the production of fungal polysaccharide fibrils, allowing hypha aggregation and attachment with the roots. TIBA inhibited this host effect. Thus, we can hypothesize that TIBA, by preventing fungal indole-3-acetic acid (IAA) transport towards the root, inhibited the production or the efflux of host elicitors responsible for the increase of fungal polysaccharide fibril production. However, we cannot exclude that TIBA had other effects than inhibiting fungal IAA transport.Key words: ectomycorrhizas, auxin transport inhibitor, polysaccharide fibrils.

Effects of indole-3-acetic acid and auxin transport inhibitor on auxin distribution and development of peanut at pegging stage

2013 ◽  
Vol 162 ◽  
pp. 76-81 ◽  
Author(s):  
Qiong Peng ◽  
Huiqun Wang ◽  
Jianhua Tong ◽  
Mohammed Humayun Kabir ◽  
Zhigang Huang ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Auxin Transport ◽  
Auxin Distribution ◽  
Transport Inhibitor ◽  
Auxin Transport Inhibitor ◽  
Indole 3 Acetic Acid

Corrigendum to: Auxin is required for pollination-induced ovary growth in Dendrobium orchids

2006 ◽  
Vol 33 (10) ◽  
pp. 981 ◽  
Author(s):  
Saichol Ketsa ◽  
Apinya Wisutiamonkul ◽  
Wouter G. van Doorn
Keyword(s):  
Auxin Transport ◽  
Isobutyric Acid ◽  
Signalling Pathway ◽  
Aminooxyacetic Acid ◽  
Ethylene Synthesis ◽  
Transport Inhibitor ◽  
Auxin Signalling ◽  
Auxin Transport Inhibitor ◽  
Ethylene Action ◽  
Ovary Growth

In Dendrobium and other orchids the ovule becomes mature long after pollination, whereas the ovary starts growing within two days of pollination. The signalling pathway that induces rapid ovary growth after pollination has remained elusive. We placed the auxin antagonist �-(p-chlorophenoxy) isobutyric acid (PCIB) or the auxin transport inhibitor 2,3,5-triiodobenzoic acid (TIBA) on the stigma, before pollination. Both treatments nullified pollination-induced ovary growth. The ovaries also did not grow after similar stigma treatment with 1-methylcyclopropene (1-MCP), AgNO3 (both inhibitors of ethylene action), aminooxyacetic acid (AOA) or CoCl2 (which both inhibit ethylene synthesis), before pollination. Pollination could be replaced by placement of the auxin naphthylacetic acid (NAA) on the stigma. All mentioned inhibitors nullified the effect of NAA, indicating that if auxin is the initiator of ovary growth, it acts through ethylene. The results suggest that the pollination effect on ovary growth requires auxin (at least auxin transport and maybe also auxin signalling), and both ethylene synthesis and ethylene action.

The white-tip nematode, Aphelenchoides besseyi, exhibits an auxin-orientated behaviour affecting its migration and propagation

Nematology ◽  
2014 ◽  
Vol 16 (7) ◽  
pp. 837-845 ◽  
Author(s):  
Hui Feng ◽  
Ying Shao ◽  
Li-hui Wei ◽  
Cun-yi Gao ◽  
Yi-jun Zhou
Keyword(s):  
Auxin Transport ◽  
Naphthaleneacetic Acid ◽  
Male Sterile ◽  
Auxin Level ◽  
Rice Plants ◽  
Transport Inhibitor ◽  
Large Numbers ◽  
Auxin Concentration ◽  
Aphelenchoides Besseyi ◽  
Auxin Transport Inhibitor

Aphelenchoides besseyi is an obligate parasite that often causes white-tip symptoms in rice plants. The nematode exhibits ectoparasitic behaviour with its infection rate matching the development of rice plants. Few studies have analysed how A. besseyi migration is influenced by chemical and host factors. Here, we focused on the effects of auxins on nematode migration and propagation. Exposure of A. besseyi to an auxin gradient created by a Pluronic F-127 gel resulted in nematode aggregation at the highest auxin concentration tested, 100 μm. Inoculation on the susceptible cv. Ningjing1 produced more nematodes than on the resistant rice cv. Tetep, which correlated with their endogenous auxin levels. Young panicles treated with 1-naphthaleneacetic acid produced more grains and nematodes, whereas plants treated with the auxin transport inhibitor, 2,3,5-triiodobenzoic acid, led to fewer nematodes in the seeds. In addition, A. besseyi rarely migrated and multiplied in the plants of the male sterile rice cv. Zhenshan97A, which had insufficient auxin level in pollen and thus could not generate any grains in most panicles. However, large numbers of nematodes were observed in seeds of cv. Zhenshan97A that had received pollens from the maintainer cv. Zhenshan97B. The results indicate that auxin might play a key role in the migration and propagation of A. besseyi.

Biokinetics and Efficacy of Aminocyclopyrachlor-Methyl Ester as Influenced by Diflufenzopyr

Weed Science ◽  
2014 ◽  
Vol 62 (3) ◽  
pp. 538-547 ◽  
Author(s):  
Jose J. Vargas ◽  
James T. Brosnan ◽  
Thomas C. Mueller ◽  
Dean A. Kopsell ◽  
William E. Klingeman ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Auxin Transport ◽  
Free Acid ◽  
Acid Metabolite ◽  
Black Nightshade ◽  
Species Accumulation ◽  
Transport Inhibitor ◽  
Auxin Transport Inhibitor ◽  
Time Point ◽  
Large Crabgrass

Research studies evaluated effects of the auxin transport inhibitor, diflufenzopyr, on the biokinetics and efficacy of aminocyclopyrachlor-methyl ester (AMCP-ME) applications to black nightshade and large crabgrass. Absorption, translocation, and metabolism of 14C-AMCP-ME was quantified with and without diflufenzopyr (35 g ai ha−1). Diflufenzopyr had minimal effects on translocation of radioactivity in either species. Accumulation of radioactivity in aboveground plant sections of black nightshade was greater than or equal to that in large crabgrass by 72 h after treatment (HAT). In both species, metabolism of 14C-AMCP-ME was rapid, as 60 to 78% of the extracted radioactivity was the free acid metabolite 8 HAT. In the greenhouse, black nightshade and large crabgrass were treated with AMCP-ME (9, 18, and 35 g ai ha−1) alone and in combination with diflufenzopyr (35 g ha−1). Mixtures of AMCP-ME plus diflufenzopyr did not increase large crabgrass control compared with AMCP-ME alone at any time. Diflufenzopyr (35 g ha−1) increased black nightshade control with AMCP-ME (18 and 35 g ha−1) 7 d after treatment (DAT). However, this increase in control was not observed 14 or 28 DAT. All treatments containing AMCP-ME controlled large crabgrass 70 to 79% 28 DAT compared with > 93% for black nightshade at the same time point.

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