Photosynthate Regulation of the Root System Architecture Mediated by the Heterotrimeric G Protein Complex in Arabidopsis

Mudgil, Yashwanti; Karve, Abhijit; Teixeira, Paulo J. P. L.; Jiang, Kun; Tunc-Ozdemir, Meral; Jones, Alan M.

doi:10.3389/fpls.2016.01255

Title: Photosynthate Regulation of the Root System Architecture Mediated by the Heterotrimeric G Protein Complex in Arabidopsis

Journal Article · Thu Aug 25 00:00:00 EDT 2016 · Frontiers in Plant Science

DOI:https://doi.org/10.3389/fpls.2016.01255· OSTI ID:1904659

Mudgil, Yashwanti ^[1]; Karve, Abhijit ^[2]; Teixeira, Paulo J. P. L. ^[3]; Jiang, Kun ^[3]; Tunc-Ozdemir, Meral ^[3]; Jones, Alan M. ^[3]

University of Delhi, New Delhi (India); University of North Carolina, Chapel Hill, NC (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
University of North Carolina, Chapel Hill, NC (United States)

Assimilate partitioning to the root system is a desirable developmental trait to control but little is known of the signaling pathway underlying partitioning. A null mutation in the gene encoding the Gβ subunit of the heterotrimeric G protein complex, a nexus for a variety of signaling pathways, confers altered sugar partitioning in roots. While fixed carbon rapidly reached the roots of wild type and agb1-2 mutant seedlings, agb1 roots had more of this fixed carbon in the form of glucose, fructose, and sucrose which manifested as a higher lateral root density. Upon glucose treatment, the agb1-2 mutant had abnormal gene expression in the root tip validated by transcriptome analysis. In addition, PIN2 membrane localization was altered in the agb1-2 mutant. The heterotrimeric G protein complex integrates photosynthesis-derived sugar signaling incorporating both membrane-and transcriptional-based mechanisms. The time constants for these signaling mechanisms are in the same range as photosynthate delivery to the root, raising the possibility that root cells are able to use changes in carbon fixation in real time to adjust growth behavior.

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Research Organization:: University of North Carolina, Chapel Hill, NC (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Institute of General Medical Sciences (NIGMS); National Science Foundation (NSF); Government of India; Delhi University; Pew Latin American Fellows Program

Grant/Contract Number:: FG02-05ER15671; R01GM065989; MCB-0723515; MCB-1158054; MCB-0718202

OSTI ID:: 1904659

Journal Information:: Frontiers in Plant Science, Vol. 7; ISSN 1664-462X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Photosynthate Regulation of the Root System Architecture Mediated by the Heterotrimeric G Protein Complex in Arabidopsis

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