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Ethylene controls adventitious root initiation sites in Arabidopsis hypocotyls independently of strigolactones

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Abstract
Adventitious root formation is essential for cutting propagation of diverse species; however, until recently little was known about its regulation. Strigolactones and ethylene have both been shown to inhibit adventitious roots and it has been suggested that ethylene interacts with strigolactones in root hair elongation. We have investigated the interaction between strigolactones and ethylene in regulating adventitious root formation in intact seedlings of Arabidopsis thaliana. We used strigolactone mutants together with 1-aminocyclopropane-1-carboxylic acid (ACC) (ethylene precursor) treatments and ethylene mutants together with GR24 (strigolactone agonist) treatments. Importantly, we conducted a detailed mapping of adventitious root initiation along the hypocotyl and measured ethylene production in strigolactone mutants. ACC treatments resulted in a slight increase in adventitious root formation at low doses and a decrease at higher doses, in both wild-type and strigolactone mutants. Furthermore, the distribution of adventitious roots dramatically changed to the top third of the hypocotyl in a dose-dependent manner with ACC treatments in both wild-type and strigolactone mutants. The ethylene mutants all responded to treatments with GR24. Wild type and max4 (strigolactone-deficient mutant) produced the same amount of ethylene, while emanation from max2 (strigolactone-insensitive mutant) was lower. We conclude that strigolactones and ethylene act largely independently in regulating adventitious root formation with ethylene controlling the distribution of root initiation sites. This role for ethylene may have implications for flood response because both ethylene and adventitious root development are crucial for flood tolerance.
Keywords
Adventitious roots, Arabidopsis, Ethylene, Etiolation, Hypocotyl zonation, Strigolactone, SUNFLOWER HELIANTHUS-ANNUUS, APICAL HOOK DEVELOPMENT, BOX PROTEIN MAX2, AUXIN TRANSPORT, STRIGA-HERMONTHICA, CELL ELONGATION, WOUND RESPONSE, BIOSYNTHESIS, THALIANA, SEEDLINGS

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Citation

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Chicago
Rasmussen, Amanda, Yuming Hu, Thomas Depaepe, Filip Vandenbussche, Francois-Didier Boyer, Dominique Van Der Straeten, and Danny Geelen. 2017. “Ethylene Controls Adventitious Root Initiation Sites in Arabidopsis Hypocotyls Independently of Strigolactones.” Journal of Plant Growth Regulation 36 (4): 897–911.
APA
Rasmussen, A., Hu, Y., Depaepe, T., Vandenbussche, F., Boyer, F.-D., Van Der Straeten, D., & Geelen, D. (2017). Ethylene controls adventitious root initiation sites in Arabidopsis hypocotyls independently of strigolactones. JOURNAL OF PLANT GROWTH REGULATION, 36(4), 897–911.
Vancouver
1.
Rasmussen A, Hu Y, Depaepe T, Vandenbussche F, Boyer F-D, Van Der Straeten D, et al. Ethylene controls adventitious root initiation sites in Arabidopsis hypocotyls independently of strigolactones. JOURNAL OF PLANT GROWTH REGULATION. 2017;36(4):897–911.
MLA
Rasmussen, Amanda, Yuming Hu, Thomas Depaepe, et al. “Ethylene Controls Adventitious Root Initiation Sites in Arabidopsis Hypocotyls Independently of Strigolactones.” JOURNAL OF PLANT GROWTH REGULATION 36.4 (2017): 897–911. Print.
@article{8547216,
  abstract     = {Adventitious root formation is essential for cutting propagation of diverse species; however, until recently little was known about its regulation. Strigolactones and ethylene have both been shown to inhibit adventitious roots and it has been suggested that ethylene interacts with strigolactones in root hair elongation. We have investigated the interaction between strigolactones and ethylene in regulating adventitious root formation in intact seedlings of Arabidopsis thaliana. We used strigolactone mutants together with 1-aminocyclopropane-1-carboxylic acid (ACC) (ethylene precursor) treatments and ethylene mutants together with GR24 (strigolactone agonist) treatments. Importantly, we conducted a detailed mapping of adventitious root initiation along the hypocotyl and measured ethylene production in strigolactone mutants. ACC treatments resulted in a slight increase in adventitious root formation at low doses and a decrease at higher doses, in both wild-type and strigolactone mutants. Furthermore, the distribution of adventitious roots dramatically changed to the top third of the hypocotyl in a dose-dependent manner with ACC treatments in both wild-type and strigolactone mutants. The ethylene mutants all responded to treatments with GR24. Wild type and max4 (strigolactone-deficient mutant) produced the same amount of ethylene, while emanation from max2 (strigolactone-insensitive mutant) was lower. We conclude that strigolactones and ethylene act largely independently in regulating adventitious root formation with ethylene controlling the distribution of root initiation sites. This role for ethylene may have implications for flood response because both ethylene and adventitious root development are crucial for flood tolerance.},
  author       = {Rasmussen, Amanda and Hu, Yuming and Depaepe, Thomas and Vandenbussche, Filip and Boyer, Francois-Didier and Van Der Straeten, Dominique and Geelen, Danny},
  issn         = {0721-7595},
  journal      = {JOURNAL OF PLANT GROWTH REGULATION},
  keyword      = {Adventitious roots,Arabidopsis,Ethylene,Etiolation,Hypocotyl zonation,Strigolactone,SUNFLOWER HELIANTHUS-ANNUUS,APICAL HOOK DEVELOPMENT,BOX PROTEIN MAX2,AUXIN TRANSPORT,STRIGA-HERMONTHICA,CELL ELONGATION,WOUND RESPONSE,BIOSYNTHESIS,THALIANA,SEEDLINGS},
  language     = {eng},
  number       = {4},
  pages        = {897--911},
  title        = {Ethylene controls adventitious root initiation sites in Arabidopsis hypocotyls independently of strigolactones},
  url          = {http://dx.doi.org/10.1007/s00344-017-9692-8},
  volume       = {36},
  year         = {2017},
}

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