scholarly journals The Ethylene-Insensitive sickle Mutant of Medicago truncatula Shows Altered Auxin Transport Regulation during Nodulation

2006 ◽  
Vol 142 (1) ◽  
pp. 168-180 ◽  
Author(s):  
Joko Prayitno ◽  
Barry G. Rolfe ◽  
Ulrike Mathesius
Keyword(s):  
Medicago Truncatula ◽  
Auxin Transport ◽  
Transport Regulation

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

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

scholarly journals The Compact Root Architecture1 Gene Regulates Lignification, Flavonoid Production, and Polar Auxin Transport in Medicago truncatula

2010 ◽  
Vol 153 (4) ◽  
pp. 1597-1607 ◽  
Author(s):  
Carole Laffont ◽  
Sandrine Blanchet ◽  
Catherine Lapierre ◽  
Lysiane Brocard ◽  
Pascal Ratet ◽  
...  
Keyword(s):  
Medicago Truncatula ◽  
Auxin Transport ◽  
Polar Auxin Transport

scholarly journals Pseudonodule Formation by Wild-Type and Symbiotic Mutant Medicago truncatula in Response to Auxin Transport Inhibitors

2011 ◽  
Vol 24 (11) ◽  
pp. 1372-1384 ◽  
Author(s):  
Adriana P. Rightmyer ◽  
Sharon R. Long
Keyword(s):  
Medicago Truncatula ◽  
Sinorhizobium Meliloti ◽  
Auxin Transport ◽  
Transcriptional Response ◽  
Nodule Formation ◽  
Transcriptional Responses ◽  
Nod Factor ◽  
Phthalamic Acid ◽  
Transport Inhibitors ◽  
Auxin Transport Inhibitors

Rhizobium and allied bacteria form symbiotic nitrogen-fixing nodules on legume roots. Plant hormones play key roles in nodule formation. We treated Medicago truncatula roots with auxin transport inhibitors (ATI) N-(1-naphthyl)phthalamic acid (NPA) and 2,3,5-triiodobenzoic acid (TIBA) to induce the formation of pseudonodules. M. truncatula mutants defective for rhizobial Nod factor signal transduction still formed pseudonodules in response to ATI. However, a M. truncatula ethylene-insensitive supernodulator, sickle 1-1, did not form pseudonodules in response to TIBA, suggesting that the ethylene response pathway is involved in ATI-induced pseudonodule formation. We compared the transcriptional responses of M. truncatula roots treated with ATI to roots inoculated with Sinorhizobium meliloti. Some genes showed consistently parallel expression in ATI-induced and Rhizobium-induced nodules. For other genes, the transcriptional response of M. truncatula roots 1 and 7 days after ATI treatment was in the opposite direction to roots treated with S. meliloti; then, by 21 days, the transcriptional patterns for the two conditions became similar. We silenced 17 genes that were upregulated in both ATI and S. meliloti treatments to determine their effect on nodule formation. Some gene-silenced roots showed a decrease in nodulation efficiency, suggesting a role in nodule formation but not in later nodule functions.

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