KNOTTED1-LIKE HOMEOBOX 3: a new regulator of symbiotic nodule development

Journal of Experimental Botany
M AzarakhshL A Lutova

Abstract

KNOX transcription factors (TFs) regulate different aspects of plant development essentially through their effects on phytohormone metabolism. In particular, KNOX TF SHOOTMERISTEMLESS activates the cytokinin biosynthesis ISOPENTENYL TRANSFERASE (IPT) genes in the shoot apical meristem. However, the role of KNOX TFs in symbiotic nodule development and their possible effects on phytohormone metabolism during nodulation have not been studied to date. Cytokinin is a well-known regulator of nodule development, playing the key role in the regulation of cell division during nodule primordium formation. Recently, the activation of IPT genes was shown to take place during nodulation. Therefore, it was hypothesized that KNOX TFs may regulate nodule development and activate cytokinin biosynthesis upon nodulation. This study analysed the expression of different KNOX genes in Medicago truncatula Gaertn. and Pisum sativum L. Among them, the KNOX3 gene was upregulated in response to rhizobial inoculation in both species. pKNOX3::GUS activity was observed in developing nodule primordium. KNOX3 ectopic expression caused the formation of nodule-like structures on transgenic root without bacterial inoculation, a phenotype similar to one described...Continue Reading

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Citations

Dec 22, 2017·International Journal of Molecular Sciences·Irina V LeppyanenElena A Dolgikh
Apr 27, 2019·Frontiers in Plant Science·Alexandra V DolgikhElena A Dolgikh
Jan 25, 2018·Genome Génome / Conseil National De Recherches Canada·Krishnanand P KulkarniJeong-Dong Lee
Jan 28, 2021·International Journal of Molecular Sciences·Diptee Chaulagain, Julia Frugoli
Dec 16, 2020·Plants·Viktor E Tsyganov, Anna V Tsyganova

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Datasets Mentioned

BETA
PRJNA66035
PRJNA81209
PRJNA211622
KP296692

Methods Mentioned

BETA
PCR
transgenic
reverse transcription PCR

Software Mentioned

ZEN
Clustal W
BLASTN
MEGA6

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