Halotropism requires phospholipase Dζ1-mediated modulation of cellular polarity of auxin transport carriers

Ruud A. Korver, Thea van den Berg, Jessica A. Meyer, Carlos S. Galvan-Ampudia, Kirsten H.W.J. ten Tusscher, Christa Testerink*

*Corresponding author for this work

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1 Citation (Scopus)

Abstract

Endocytosis and relocalization of auxin carriers represent important mechanisms for adaptive plant growth and developmental responses. Both root gravitropism and halotropism have been shown to be dependent on relocalization of auxin transporters. Following their homology to mammalian phospholipase Ds (PLDs), plant PLDζ-type enzymes are likely candidates to regulate auxin carrier endocytosis. We investigated root tropic responses for an Arabidopsis pldζ1-KO mutant and its effect on the dynamics of two auxin transporters during salt stress, that is, PIN2 and AUX1. We found altered root growth and halotropic and gravitropic responses in the absence of PLDζ1 and report a role for PLDζ1 in the polar localization of PIN2. Additionally, irrespective of the genetic background, salt stress induced changes in AUX1 polarity. Utilizing our previous computational model, we found that these novel salt-induced AUX1 changes contribute to halotropic auxin asymmetry. We also report the formation of “osmotic stress-induced membrane structures.” These large membrane structures are formed at the plasma membrane shortly after NaCl or sorbitol treatment and have a prolonged presence in a pldζ1 mutant. Taken together, these results show a crucial role for PLDζ1 in both ionic and osmotic stress-induced auxin carrier dynamics during salt stress.

Original languageEnglish
Pages (from-to)143-158
JournalPlant Cell and Environment
Volume43
Issue number1
Early online date20 Aug 2019
DOIs
Publication statusPublished - Jan 2020

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Indoleacetic Acids
auxins
Salts
salt stress
Phospholipases
Osmotic Pressure
endocytosis
Endocytosis
osmotic stress
transporters
Gravitropism
mutants
gravitropism
Membranes
Sorbitol
Growth
sorbitol
Arabidopsis
genetic background
phospholipases

Cite this

Korver, R. A., van den Berg, T., Meyer, J. A., Galvan-Ampudia, C. S., ten Tusscher, K. H. W. J., & Testerink, C. (2020). Halotropism requires phospholipase Dζ1-mediated modulation of cellular polarity of auxin transport carriers. Plant Cell and Environment, 43(1), 143-158. https://doi.org/10.1111/pce.13646
Korver, Ruud A. ; van den Berg, Thea ; Meyer, Jessica A. ; Galvan-Ampudia, Carlos S. ; ten Tusscher, Kirsten H.W.J. ; Testerink, Christa. / Halotropism requires phospholipase Dζ1-mediated modulation of cellular polarity of auxin transport carriers. In: Plant Cell and Environment. 2020 ; Vol. 43, No. 1. pp. 143-158.
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abstract = "Endocytosis and relocalization of auxin carriers represent important mechanisms for adaptive plant growth and developmental responses. Both root gravitropism and halotropism have been shown to be dependent on relocalization of auxin transporters. Following their homology to mammalian phospholipase Ds (PLDs), plant PLDζ-type enzymes are likely candidates to regulate auxin carrier endocytosis. We investigated root tropic responses for an Arabidopsis pldζ1-KO mutant and its effect on the dynamics of two auxin transporters during salt stress, that is, PIN2 and AUX1. We found altered root growth and halotropic and gravitropic responses in the absence of PLDζ1 and report a role for PLDζ1 in the polar localization of PIN2. Additionally, irrespective of the genetic background, salt stress induced changes in AUX1 polarity. Utilizing our previous computational model, we found that these novel salt-induced AUX1 changes contribute to halotropic auxin asymmetry. We also report the formation of “osmotic stress-induced membrane structures.” These large membrane structures are formed at the plasma membrane shortly after NaCl or sorbitol treatment and have a prolonged presence in a pldζ1 mutant. Taken together, these results show a crucial role for PLDζ1 in both ionic and osmotic stress-induced auxin carrier dynamics during salt stress.",
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Halotropism requires phospholipase Dζ1-mediated modulation of cellular polarity of auxin transport carriers. / Korver, Ruud A.; van den Berg, Thea; Meyer, Jessica A.; Galvan-Ampudia, Carlos S.; ten Tusscher, Kirsten H.W.J.; Testerink, Christa.

In: Plant Cell and Environment, Vol. 43, No. 1, 01.2020, p. 143-158.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - Endocytosis and relocalization of auxin carriers represent important mechanisms for adaptive plant growth and developmental responses. Both root gravitropism and halotropism have been shown to be dependent on relocalization of auxin transporters. Following their homology to mammalian phospholipase Ds (PLDs), plant PLDζ-type enzymes are likely candidates to regulate auxin carrier endocytosis. We investigated root tropic responses for an Arabidopsis pldζ1-KO mutant and its effect on the dynamics of two auxin transporters during salt stress, that is, PIN2 and AUX1. We found altered root growth and halotropic and gravitropic responses in the absence of PLDζ1 and report a role for PLDζ1 in the polar localization of PIN2. Additionally, irrespective of the genetic background, salt stress induced changes in AUX1 polarity. Utilizing our previous computational model, we found that these novel salt-induced AUX1 changes contribute to halotropic auxin asymmetry. We also report the formation of “osmotic stress-induced membrane structures.” These large membrane structures are formed at the plasma membrane shortly after NaCl or sorbitol treatment and have a prolonged presence in a pldζ1 mutant. Taken together, these results show a crucial role for PLDζ1 in both ionic and osmotic stress-induced auxin carrier dynamics during salt stress.

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