The Conserved and Specific Roles of the LUX ARRHYTHMO in Circadian Clock and Nodulation

International Journal of Molecular Sciences

Zhe Meng¹  Yiming Kong²  Yuxue Zhang²  Xiaolin Yu²  Chuanen Zhou²  Xiu Liu²  Lu Han² 

[1] Shandong Provincial Key Laboratory of Plant Stress, College of Life Science, Shandong Normal University, Ji’nan 250300, China;The Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao 266237, China;

关键词: legume;    Medicago truncatula;    MtLUX;    MtFTa1;    circadian clock;    photoperiodic flowering;   

DOI  :  10.3390/ijms23073473

来源: DOAJ

【 摘 要 】

LUX ARRHYTHMO (LUX) plays a key role in circadian rhythms and flowering. Here, we identified the MtLUX gene which is the putative ortholog of LUX in Medicago truncatula. The roles of MtLUX, in both the nodulation belowground and leaf movement aboveground, were investigated by characterizing a loss-of-function mtlux mutant. MtLUX was required for the control of flowering time under both long-day and short-day conditions. Further investigations showed that the early flowering in the mtlux mutant was correlated with the elevated expression level of the MtFTa1 gene but in a CO-like independent manner. MtLUX played a conserved role in the regulatory interactions with MtLHY, MtTOC1, and MtPRR genes, which is similar to those in other species. Meanwhile, the unexpected functions of MtLUX were revealed in nodule formation and nyctinastic leaf movement, probably through the indirect regulation in MtLHY. Its participation in nodulation is of interest in the context of functional conservation and the neo-functionalization of the products of LUX orthologs.

【 授权许可】

Unknown