4.8 Article

PUCHI regulates very long chain fatty acid biosynthesis during lateral root and callus formation

Publisher

NATL ACAD SCIENCES
DOI: 10.1073/pnas.1906300116

Keywords

lateral root formation; morphogenesis; VLCFA; callus formation; cell division

Funding

  1. Institute of Research for Development, the University of Montpellier
  2. University of Science and Technology of Hanoi
  3. French Embassy in Hanoi
  4. ENS Paris
  5. French National Research Agency (ANR) through NewRoot project [ANR-17-CE13-0004-01]
  6. Biological and Biotechnology Science Research Council (BBSRC)
  7. Engineering and Physical Sciences Research Council [BB/D019613/1]
  8. BBSRC [BB/H020314/1]
  9. LabEx Saclay Plant Sciences-SPS Grant [ANR-10-LABX-0040-SPS]
  10. Bordeaux Metabolome Facility-MetaboHUB [ANR-11-INBS-0010]
  11. [19060006]
  12. [25110330]
  13. Agence Nationale de la Recherche (ANR) [ANR-17-CE13-0004] Funding Source: Agence Nationale de la Recherche (ANR)
  14. BBSRC [BB/D019613/1, BB/M019837/1, BB/H020314/1] Funding Source: UKRI

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Lateral root organogenesis plays an essential role in elaborating plant root system architecture. In Arabidopsis, the AP2 family transcription factor PUCHI controls cell proliferation in lateral root primordia. To identify potential targets of PUCHI, we analyzed a time course transcriptomic dataset of lateral root formation. We report that multiple genes coding for very long chain fatty acid (VLCFA) biosynthesis enzymes are induced during lateral root development in a PUCHI-dependent manner. Significantly, several mutants perturbed in VLCFA biosynthesis show similar lateral root developmental defects as puchi-1. Moreover, puchi-1 roots display the same disorganized callus formation phenotype as VLCFA biosynthesis-deficient mutants when grown on auxin-rich callus-inducing medium. Lipidomic profiling of puchi-1 roots revealed reduced VLCFA content compared with WT. We conclude that PUCHI-regulated VLCFA biosynthesis is part of a pathway controlling cell proliferation during lateral root and callus formation.

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