TAILIEUCHUNG - báo cáo khoa học: " Auxin and nitric oxide control indeterminate nodule formation"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Auxin and nitric oxide control indeterminate nodule formation | BMC Plant Biology BioMed Central Research article Auxin and nitric oxide control indeterminate nodule formation Youry Pii Massimo Crimi Giorgia Cremonese Angelo Spena and Tiziana Pandolfini Open Access Address Dipartimento Scientifico Tecnologico University of Verona Verona Italy Email Youry Pii - pii@ Massimo Crimi - Giorgia Cremonese - giorgia7@ Angelo Spena - Tiziana Pandolfini - Corresponding author Published 8 May 2007 Received 10 November 2006 BMC Plant Biology 2007 7 21 doi l47l-2229-7-2l Accepted 8 May 2007 This article is available from http l47l-2229 7 2l 2007 Pii et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract__ Background Rhizobia symbionts elicit root nodule formation in leguminous plants. Nodule development requires local accumulation of auxin. Both plants and rhizobia synthesise auxin. We have addressed the effects of bacterial auxin IAA on nodulation by using Sinorhizobium meliloti and Rhizobium leguminosarum bacteria genetically engineered for increased auxin synthesis. Results IAA-overproducing S. meliloti increased nodulation in Medicago species whilst the increased auxin synthesis of R. leguminosarum had no effect on nodulation in Phaseolus vulgaris a legume bearing determinate nodules. Indeterminate legumes Medicago species bearing IAA-overproducing nodules showed an enhanced lateral root development a process known to be regulated by both IAA and nitric oxide NO . Higher NO levels were detected in indeterminate nodules of Medicago plants formed by the IAA-overproducing rhizobia. The .

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