Institut des Sciences du Végétal; CNRS; Gif sur Yvette Cedex, France; Laboratoire de Recherche en Sciences Végétales; Université Paul Sabatier CNRS; Castanet Tolosan, France.
Plant Signal Behav. 2013 Aug;8(8). doi: 10.4161/psb.24969. Epub 2013 May 15.
Legume plants develop symbiosis specific organs on their roots as a result of their interaction with rhizobia. These organs, called nodules, house the nitrogen fixing bacteria. The molecular mechanisms governing the identity and maintenance of this organ are still poorly understood, but it is supposed that root and nodule development share common features. We have identified the Medicago truncatula nodule root (NOOT) and Pisum sativum cochleata (COCH) orthologous genes as necessary for the robust maintenance of nodule identity throughout the nodule developmental program. NOOT and COCH are Arabidopsis blade-on-petiole (BOP) orthologs and NOOT and COCH show functions in leaf and flower development in M. truncatula and P. sativum respectively that are conserved with the functions of BOP in Arabidopsis. The characterization of the noot and coch mutants highlights the root evolutionary origin of nodule vascular strands and suggests that the NOOT and COCH genes were recruited to repress root identity in the legume symbiotic organ.
豆科植物在其根部发育出与根瘤菌相互作用的共生特化器官。这些器官被称为根瘤，其中容纳了固氮细菌。尽管调控这种器官的特性和维持的分子机制仍知之甚少，但人们推测根和根瘤的发育具有共同的特征。我们已经确定了蒺藜苜蓿根瘤（NOOT）和豌豆螺旋状（COCH）同源基因是在整个根瘤发育过程中维持根瘤特性所必需的。NOOT 和 COCH 是拟南芥叶柄上叶片（BOP）的同源物，并且 NOOT 和 COCH 在蒺藜苜蓿和豌豆中的功能分别在于叶片和花的发育，这与拟南芥中 BOP 的功能是保守的。noot 和 coch 突变体的特征强调了根瘤维管束的根进化起源，并表明 NOOT 和 COCH 基因被招募来抑制豆科共生器官中的根特性。
