MtHAP2-1 is a key transcriptional regulator of symbiotic nodule development regulated by microRNA169 in Medicago truncatula

Author:

Combier Jean-Philippe,Frugier Florian,de Billy Françoise,Boualem Adnane,El-Yahyaoui Fikri,Moreau Sandra,Vernié Tatiana,Ott Thomas,Gamas Pascal,Crespi Martin,Niebel Andreas

Abstract

In the model legume Medicago truncatula, we identified a new transcription factor of the CCAAT-binding family, MtHAP2-1, for which RNA interference (RNAi) and in situ hybridization experiments indicate a key role during nodule development, possibly by controlling nodule meristem function. We could also show that MtHAP2-1 is regulated by microRNA169, whose overexpression leads to the same nodule developmental block as MtHAP2-1 RNAi constructs. The complementary expression pattern of miR169 and MtHAP2-1 and the phenotype of miR169-resistant MtHAP2-1 nodules strongly suggest, in addition, that the miR169-mediated restriction of MtHAP2-1 expression to the nodule meristematic zone is essential for the differentiation of nodule cells.

Publisher

Cold Spring Harbor Laboratory

Subject

Developmental Biology,Genetics

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