Genetic Components of Root Architecture Remodeling in Response to Salt Stress

Julkowska, Magdalena; Koevoets, Iko Tamar; Mol, Selena; Hoefsloot, Huub C. J.; Feron, Richard; Tester, Mark; Keurentjes, Joost J. B.; Korte, Arthur; Haring, Michel A.; Boer, Gert-Jan de; Testerink, Christa

doi:10.1105/tpc.16.00680

Cited by 191 publications

(184 citation statements)

References 68 publications

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“…showed that a cyp79b2 cyp79b3 double-knockout mutant showed reduced growth and reduced IAA production specifically under higher temperatures [27]. Recently, the same mutant was observed to have decreased lateral root growth during salt stress [25]. Whereas the IPyA pathway is mainly active in the differentiation and elongation zone of the main (and lateral) root, genes in the IAOx pathway are, in addition to expression in the QC, strongly expressed in cells underlying newly developing lateral roots and lateral root primordia [43].…”

Section: Controlling the Levels Of Auxinmentioning

confidence: 98%

“…In addition, for the Brassicaceae family, the indole-3-acetaldoxime (IAOx) pathway has been increasingly identified to play a role during several stress responses 25, 26, 27, whereas the significance of the other pathways remains under debate and needs further research 21, 22. We focus here on the IPyA and IAOx pathways, and on how these pathways are modulated during abiotic stress.…”

Section: Controlling the Levels Of Auxinmentioning

confidence: 99%

“…More recently, however, several papers have pointed out a possible involvement of this pathway in local IAA production, specifically under stress conditions 25, 26, 27, 42. Sugawara et al .…”

Section: Controlling the Levels Of Auxinmentioning

confidence: 99%

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Out of Shape During Stress: A Key Role for Auxin

Korver

Koevoets

Testerink

2018

Trends in Plant Science

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197

120

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In most abiotic stress conditions, including salinity and water deficit, the developmental plasticity of the plant root is regulated by the phytohormone auxin. Changes in auxin concentration are often attributed to changes in shoot-derived long-distance auxin flow. However, recent evidence suggests important contributions by short-distance auxin transport from local storage and local auxin biosynthesis, conjugation, and oxidation during abiotic stress. We discuss here current knowledge on long-distance auxin transport in stress responses, and subsequently debate how short-distance auxin transport and indole-3-acetic acid (IAA) metabolism play a role in influencing eventual auxin accumulation and signaling patterns. Our analysis stresses the importance of considering all these components together and highlights the use of mathematical modeling for predictions of plant physiological responses.

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Section: Controlling the Levels Of Auxinmentioning

confidence: 98%

Section: Controlling the Levels Of Auxinmentioning

confidence: 99%

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Out of Shape During Stress: A Key Role for Auxin

Korver

Koevoets

Testerink

2018

Trends in Plant Science

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197

120

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“…Osmotic stress signals through the SnRK2 family kinases and MAPK (MPK3/MPK6 and MPK4) cascades (de Zelicourt et al, 2016;Zhu, 2016). In addition, ROS, ABA, GAs, BRs, JA and ethylene constitute complex signaling networks to mediate salt tolerance and acclimation, largely through ion compartmentalization, osmolyte accumulation and remodeling of the RSA (Jiang et al, 2012(Jiang et al, , 2013Duan et al, 2013;Geng et al, 2013;Julkowska et al, 2017;. The possible molecular links between these components and the aforementioned immune regulators remain understudied in salt tolerance.…”

Section: Reviewmentioning

confidence: 99%

Plant immunity in signal integration between biotic and abiotic stress responses

2019

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Summary Plants constantly monitor and cope with the fluctuating environment while hosting a diversity of plant‐inhabiting microbes. The mode and outcome of plant–microbe interactions, including plant disease epidemics, are dynamically and profoundly influenced by abiotic factors, such as light, temperature, water and nutrients. Plants also utilize associations with beneficial microbes during adaptation to adverse conditions. Elucidation of the molecular bases for the plant–microbe–environment interactions is therefore of fundamental importance in the plant sciences. Following advances into individual stress signaling pathways, recent studies are beginning to reveal molecular intersections between biotic and abiotic stress responses and regulatory principles in combined stress responses. We outline mechanisms underlying environmental modulation of plant immunity and emerging roles for immune regulators in abiotic stress tolerance. Furthermore, we discuss how plants coordinate conflicting demands when exposed to combinations of different stresses, with attention to a possible determinant that links initial stress response to broad‐spectrum stress tolerance or prioritization of specific stress tolerance.

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“…Eventually, growth reinitiates at a lower rate as before the stress (Geng et al, 2013;Julkowska & Testerink, 2015). Main root and lateral roots are affected differently by soil salinity, resulting in differences in overall root system architecture (RSA) as compared with control conditions (Julkowska et al, 2014;Julkowska et al, 2017). Besides adaptation of overall RSA to saline soils, plants are also capable of changing their direction of root growth, that is, away from salt, a phenomenon called halotropism (Galvan-Ampudia et al, 2013).…”

mentioning

confidence: 99%

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

Korver

Berg

Meyer

et al. 2019

Plant Cell & Environment

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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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Genetic Components of Root Architecture Remodeling in Response to Salt Stress

Cited by 191 publications

References 68 publications

Out of Shape During Stress: A Key Role for Auxin

Out of Shape During Stress: A Key Role for Auxin

Plant immunity in signal integration between biotic and abiotic stress responses

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

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