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Title: Infection thread and nodule development in the Medicago truncatula-Sinorhizobium meliloti symbiosis
Author: Richens, Jennifer Helen
ISNI:       0000 0004 2672 4664
Awarding Body: University of East Anglia
Current Institution: University of East Anglia
Date of Award: 2008
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The Medicago truncatula - Sinorhizobium meliloti symbiosis leads to the development ofa novel plant organ on the root, known as the nodule. Within the nodule are cells infected with differentiated rhizobia which are capable of converting atmospheric nitrogen into ammonia, a reduced form of nitrogen which can be utilised by plants. The rhizobia provide the host with a supply of reduced nitrogen, and in return the plants provide a carbon source on which the rhizobia survive, and a lowoxygen environment suitable for nitrogen fixation. The work herein describes the characterisation of the ritl mutant, and positional cloning of the RITl gene found to be essential for normal nodulation in the model legume Medieago /rlillea/lila. RITl was found to be necessary for infection thread development; required for delivery of the rhizobia into the nodule cells. In addition to its role in nodulation, R1Tl is also required for normal root hair, trichome and seed coat development. As infection threads, root hairs and trichomes are all polar growing structures, a role for RITl in polar growth is revealed. Specifically what this role could be is discussed along with future experiments.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available