期刊
PLANT SIGNALING & BEHAVIOR
卷 8, 期 3, 页码 -出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.23359
关键词
auxin; CCaMK; Lotus japonicus; nodulation; spontaneous nodule formation
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [22870035, 23012038, 22128006]
In leguminous plants, rhizobial infection of the epidermis triggers proliferation of cortical cells to form a nodule primordium. Recent studies have demonstrated that two classic phytohormones, cytokinin and auxin, have important functions in nodulation. The identification of these functions in Lotus japonicus was facilitated by use of the spontaneous nodule formation 2 (snf2) mutation of the putative cytokinin receptor LOTUS HISTIDINE KINASE 1 (LHK1). Analyses using snf2 demonstrated that constitutive activation of cytokinin signaling causes formation of spontaneous nodule-like structures in the absence of rhizobia and that auxin responses are induced in proliferating cortical cells during such spontaneous nodule development. Thus, cytokinin signaling positively regulates the auxin response. In the present study, we further investigated the induction of the auxin response using a gain-of-function mutation of Ca2+/calmodulindependent protein kinase (CCaMK) that causes spontaneous nodule formation. We demonstrate that CCaMKT265 Dmediated spontaneous nodule development is accompanied by a localized auxin response. Thus, a localized auxin response at the site of an incipient nodule primordium is essential for nodule organogenesis.
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