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Plant Signal Behav. 2015;10(9):e1028703. doi: 10.1080/15592324.2015.1028703.

Does SUNN-SYMRK Crosstalk occur in Medicago truncatula for regulating nodule organogenesis?

Author information

1
a Department of Biochemistry ; University of Calcutta ; Kolkata , India.

Abstract

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-kd 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-kd 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.

KEYWORDS:

SUNN; SYMRK; autoregulation of nodulation; ethylene; sickle; spontaneous nodulation; supernodulation

PMID:
25893374
PMCID:
PMC4883944
DOI:
10.1080/15592324.2015.1028703
[Indexed for MEDLINE]
Free PMC Article

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