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Plant circadian clock control of Medicago truncatula nodulation via regulation of Nodule Cysteine-Rich peptides

J.Exp.Bot apr22Achom, M, Roy, P, Lagunas, B, Picot, E , Richards, L , Bonyadi-Pour, R, Pardal, AJ , Baxter, L, Richmond, B, Aschauer, N, Fletcher, E, Rowson, M , Blackwell, J, Rich-Griffin, C, Mysore, KS , Wen, J, Ott, S, Carre, IA and Gifford, ML

Legumes house nitrogen-fixing endosymbiotic rhizobia in specialized polyploid cells within root nodules, which undergo tightly regulated metabolic activity. By carrying out expression analysis of transcripts over time in Medicago truncatula nodules, we found that the circadian clock enables coordinated control of metabolic and regulatory processes linked to nitrogen fixation. Until now, studies have suggested that NCRs act to regulate bacteroid differentiation and keep the rhizobial population in check. However, these conclusions came from the study of a few members of this very large gene family that has complex diversified spatio-temporal expression. We suggest that rhythmic expression of NCRs may be important for temporal coordination of bacterial activity with the rhythms of the plant host, in order to ensure optimal symbiosis

Journal of Experimental Botany. April 2022

Wed 25 May 2022, 08:39 | Tags: Plant and Crop Science