Journal
PLANT SIGNALING & BEHAVIOR
Volume 10, Issue 9, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15592324.2015.1028703
Keywords
sickle; supernodulation; ethylene; spontaneous nodulation; SUNN; SYMRK; autoregulation of nodulation
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Funding
- Center of Excellence and Innovation in Biotechnology, Department of Biotechnology, Government of India [BT/01/CEIB/09/VI/10]
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Recently we reported that overexpression of intracellular kinase domain of Symbiosis Receptor Kinase (SYMRK-kd) hyperactivated spontaneous nodulation in Medicago truncatula indicating the importance of SYMRK ectodomain in restricting nodule number. To clarify whether sunn and sickle pathways were overcome by SYMRK-kd for hyperactivation of nodule organogenesis, we overexpressed SYMRK-kd in these mutants and analyzed for spontaneous nodulation in absence of rhizobia. Spontaneous nodulation in skl/SYMRK-kd roots was 2-fold higher than A17/SYMRK-kd roots indicating nodule organogenesis induced by SYMRK-k(d) to be ethylene sensitive. Intriguingly, sunn/SYMRK-kd roots failed to generate any spontaneous nodule which directly indicate the LRR-RLK SUNN to have a role in SYMRK-k(d) mediated nodule development under non-symbiotic conditions. We hypothesize a crosstalk between SUNN and SYMRK receptors for activation as well as restriction of nodule development.
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