Journal
PLANT SIGNALING & BEHAVIOR
Volume 8, Issue 11, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.26114
Keywords
arabidopsis; boron deficiency; calcium signaling; Ca2+-dependent protein kinases; calmodulin-like proteins; transcription factors
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Funding
- Ministerio de Economia y Competitividad [BFU2009-08397, BFU2012-37445]
- Junta de Andalucia, Spain [BIO-266, P09-CVI-4721]
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Boron (B) plays a well-known structural role in the cell wall, however the way of perceiving B deficiency by roots and transmitting this environmental signal to the nucleus to elicit a response is not well established. It is known that the direct interaction between Ca2+ sensors and transcription factors (TFs) is a necessary step to regulate the expression of downstream target genes in some signaling pathways. Interestingly, B deprivation affected gene expressions of several TFs belonging to MYB, WRKY, and bZIP families, as well as expressions of Ca2+-related genes such as several CML (calmodulin-like protein) and CPK (Ca2+-dependent protein kinase) genes. Taken together, these results suggest that B deficiency could affect the expression of downstream target genes by alteration of a calcium signaling pathway in which the interaction between CMLs and/or CPKs with TFs (activator or repressor) would be a crucial step, which would explain why some genes are upregulated whereas others are repressed upon B deprivation.
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