New insights into the salt tolerance of the extreme halophytic species Lycium humile (Lycieae, Solanaceae)

Research output: Contribution to journalArticleResearchpeer review

Authors

  • M. Virginia Palchetti
  • Mariana Reginato
  • Analía Llanes
  • Johann Hornbacher
  • Jutta Papenbrock
  • Gloria E. Barboza
  • Virginia Luna
  • Juan José Cantero

Research Organisations

External Research Organisations

  • Universidad Nacional de Cordoba
  • Universidad Nacional de Rio Cuarto
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Details

Original languageEnglish
Pages (from-to)166-177
Number of pages12
JournalPlant physiology and biochemistry
Volume163
Early online date2 Apr 2021
Publication statusPublished - Jun 2021

Abstract

Knowledge about Solanaceae species naturally adapted to salinity is scarce, despite the fact that a considerable number of Solanaceae has been reported growing in saline environments. Lycium humile Phil. inhabits extreme saline soils in the Altiplano-Puna region (Central Andes, South America) and represents a promising experimental model to study salt tolerance in Solanaceae plants. Seeds, leaves and roots were collected from a saline environment (Salar del Diablo, Argentina). Seeds were scarified and 30 days after germination salt treatments were applied by adding NaCl salt pulses (up to 750 or 1000 mM). Different growth parameters were evaluated, and leaf spectral reflectance, endogenous phytohormone levels, antioxidant capacity, proline and elemental content, and morpho-anatomical characteristics in L. humile under salinity were analyzed both in controlled and natural conditions. The multiple salt tolerance mechanisms found in this species are mainly the accumulation of the phytohormone abscisic acid, the increase of the antioxidant capacity and proline content, together with the development of a large leaf water-storage parenchyma that allows Na+ accumulation and an efficient osmotic adjustment. Lycium humile is probably one of the most salt-tolerant Solanaceae species in the world, and, in controlled conditions, can effectively grow at high NaCl concentrations (at least, up to 750 mM NaCl) but also, in the absence of salts in the medium. Therefore, we propose that natural distribution of L. humile is more related to water availability, as a limiting factor of growth in Altiplano-Puna saline habitats, than to high salt concentrations in the soils.

Keywords

    Antioxidant, Halophyte, Mineral profile, Morpho-anatomical responses, Phytohormones, Proline, Salinity

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Physiology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Genetics
  • Agricultural and Biological Sciences(all)
  • Plant Science

Cite this

New insights into the salt tolerance of the extreme halophytic species Lycium humile (Lycieae, Solanaceae). / Palchetti, M. Virginia; Reginato, Mariana; Llanes, Analía et al.
In: Plant physiology and biochemistry, Vol. 163, 06.2021, p. 166-177.

Research output: Contribution to journalArticleResearchpeer review

Palchetti MV, Reginato M, Llanes A, Hornbacher J, Papenbrock J, Barboza GE et al. New insights into the salt tolerance of the extreme halophytic species Lycium humile (Lycieae, Solanaceae). Plant physiology and biochemistry. 2021 Jun;163:166-177. Epub 2021 Apr 2. doi: 10.1016/j.plaphy.2021.03.054
Palchetti, M. Virginia ; Reginato, Mariana ; Llanes, Analía et al. / New insights into the salt tolerance of the extreme halophytic species Lycium humile (Lycieae, Solanaceae). In: Plant physiology and biochemistry. 2021 ; Vol. 163. pp. 166-177.
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title = "New insights into the salt tolerance of the extreme halophytic species Lycium humile (Lycieae, Solanaceae)",
abstract = "Knowledge about Solanaceae species naturally adapted to salinity is scarce, despite the fact that a considerable number of Solanaceae has been reported growing in saline environments. Lycium humile Phil. inhabits extreme saline soils in the Altiplano-Puna region (Central Andes, South America) and represents a promising experimental model to study salt tolerance in Solanaceae plants. Seeds, leaves and roots were collected from a saline environment (Salar del Diablo, Argentina). Seeds were scarified and 30 days after germination salt treatments were applied by adding NaCl salt pulses (up to 750 or 1000 mM). Different growth parameters were evaluated, and leaf spectral reflectance, endogenous phytohormone levels, antioxidant capacity, proline and elemental content, and morpho-anatomical characteristics in L. humile under salinity were analyzed both in controlled and natural conditions. The multiple salt tolerance mechanisms found in this species are mainly the accumulation of the phytohormone abscisic acid, the increase of the antioxidant capacity and proline content, together with the development of a large leaf water-storage parenchyma that allows Na+ accumulation and an efficient osmotic adjustment. Lycium humile is probably one of the most salt-tolerant Solanaceae species in the world, and, in controlled conditions, can effectively grow at high NaCl concentrations (at least, up to 750 mM NaCl) but also, in the absence of salts in the medium. Therefore, we propose that natural distribution of L. humile is more related to water availability, as a limiting factor of growth in Altiplano-Puna saline habitats, than to high salt concentrations in the soils.",
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AU - Palchetti, M. Virginia

AU - Reginato, Mariana

AU - Llanes, Analía

AU - Hornbacher, Johann

AU - Papenbrock, Jutta

AU - Barboza, Gloria E.

AU - Luna, Virginia

AU - Cantero, Juan José

N1 - Funding Information: This work was supported by Secretaría de Ciencia y Tecnología-UNC (Res. 411-18) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina (PIP number 11220170100147CO). M.V.P. thanks Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) for a doctoral fellowship. M.R. thanks German Academic Exchange Service (DAAD) for the short-term research stay scholarship.

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N2 - Knowledge about Solanaceae species naturally adapted to salinity is scarce, despite the fact that a considerable number of Solanaceae has been reported growing in saline environments. Lycium humile Phil. inhabits extreme saline soils in the Altiplano-Puna region (Central Andes, South America) and represents a promising experimental model to study salt tolerance in Solanaceae plants. Seeds, leaves and roots were collected from a saline environment (Salar del Diablo, Argentina). Seeds were scarified and 30 days after germination salt treatments were applied by adding NaCl salt pulses (up to 750 or 1000 mM). Different growth parameters were evaluated, and leaf spectral reflectance, endogenous phytohormone levels, antioxidant capacity, proline and elemental content, and morpho-anatomical characteristics in L. humile under salinity were analyzed both in controlled and natural conditions. The multiple salt tolerance mechanisms found in this species are mainly the accumulation of the phytohormone abscisic acid, the increase of the antioxidant capacity and proline content, together with the development of a large leaf water-storage parenchyma that allows Na+ accumulation and an efficient osmotic adjustment. Lycium humile is probably one of the most salt-tolerant Solanaceae species in the world, and, in controlled conditions, can effectively grow at high NaCl concentrations (at least, up to 750 mM NaCl) but also, in the absence of salts in the medium. Therefore, we propose that natural distribution of L. humile is more related to water availability, as a limiting factor of growth in Altiplano-Puna saline habitats, than to high salt concentrations in the soils.

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KW - Mineral profile

KW - Morpho-anatomical responses

KW - Phytohormones

KW - Proline

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