SALT TOLERANCE IN THE HALOPHYTE <i>SUAEDA MARITIMA</i> (L.) DUM.

Clipson, Nicholas; Flowers, T. J.

doi:10.1111/j.1469-8137.1987.tb00873.x

Cited by 32 publications

(17 citation statements)

References 23 publications

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“…Control of xylem ion loading is an essential feature of salinity tolerance mechanism (Shabala, ), and concentration of NaCl in the xylem sap in tolerance species/genotypes is usually much lower than that in the external media (Bose et al, ; Clipson & Flowers, ; Shabala et al, ; Zhu, Zhou, Shabala, & Shabala, ). In halophyte species, the xylem concentration ranges typically between 20 and 100 mM (Shabala & Mackay, and references within).…”

Section: Discussionmentioning

confidence: 99%

Revealing mechanisms of salinity tissue tolerance in succulent halophytes: A case study for Carpobrotus rossi

Zeng

Shabala

Maksimović

et al. 2018

Plant Cell & Environment

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Efforts to breed salt tolerant crops could benefit from investigating previously unexplored traits. One of them is a tissue succulency. In this work, we have undertaken an electrophysiological and biochemical comparison of properties of mesophyll and storage parenchyma leaf tissues of a succulent halophyte species Carpobrotus rosii ("pigface"). We show that storage parenchyma cells of C. rossii act as Na sink and possessed both higher Na sequestration (298 vs. 215 mM NaCl in mesophyll) and better K retention ability. The latter traits was determined by the higher rate of H -ATPase operation and higher nonenzymatic antioxidant activity in this tissue. Na uptake in both tissues was insensitive to either Gd or elevated Ca ruling out involvement of nonselective cation channels as a major path for Na entry. Patch-clamp experiments have revealed that Caprobrotus plants were capable to downregulate activity of fast vacuolar channels when exposed to saline environment; this ability was higher in the storage parenchyma cells compared with mesophyll. Also, storage parenchyma cells have constitutively lower number of open slow vacuolar channels, whereas in mesophyll, this suppression was inducible by salt. Taken together, these results provide a mechanistic basis for efficient Na sequestration in the succulent leaf tissues.

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Section: Discussionmentioning

confidence: 99%

Revealing mechanisms of salinity tissue tolerance in succulent halophytes: A case study for Carpobrotus rossi

Zeng

Shabala

Maksimović

et al. 2018

Plant Cell & Environment

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“…Generally, monocot halophytes accumulate high levels of K + than Na + in their leaves (Albert and Kinzel 1973 ;Albert and Popp 1977 ). A positive relationship is believed to exist between Na + inclusion and salt tolerance in includer halophytes (Clipson and Flowers 1987 ). In such plants, K + accumulation was observed to be almost 4 % of total cations, and their Na + /K + ratios were as high as 30 at seawater level salinity (Naidoo and Rughunanan 1990 ).…”

Section: Na + /K + Discriminationmentioning

confidence: 97%

Salt Adaptation Mechanisms of Halophytes: Improvement of Salt Tolerance in Crop Plants

Joshi

Mangu

Bedre

et al. 2015

Elucidation of Abiotic Stress Signaling in Plants

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Soil salinity is one of the most serious environmental factors that affect crop productivity worldwide. Inevitable global climate change leading to rise in sea water level would exacerbate degradation of irrigation systems and contamination of ground water resources, which render conventional agricultural practices impossible due to the sensitivity of most crops to salinity. Breeding for development of salt-tolerant crop plants has been a major challenge due to the complexity and multigenic control of salt tolerance traits. Halophytes are capable of surviving and thriving under salt at concentrations as high as 5 g/L, by maintaining negative water potential. Physiological and molecular studies have suggested that halophytes, unlike glycophytes, have evolved mechanisms, such as ion homeostasis through ion extrusion and compartmentalization, osmotic adjustments, and antioxidant production for adaptation to salinity. Employment of integrated approaches involving different omics tools would amplify our understanding of the biology of stress response networks in the halophytes. Translation of the knowledge and resources generated from halophyte relatives of crop plants through functional genomics will lead to the development of new breeds of crops that are suitable for saline agriculture.

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“…Generally, monocot halophytes accumulate high levels of K + than Na + in their leaves (Albert and Kinzel 1973 ;Albert and Popp 1977 ). A positive relationship is believed to exist between Na + inclusion and salt tolerance in includer halophytes (Clipson and Flowers 1987 ). In such plants, 9 Salt Adaptation Mechanisms of Halophytes… 252 K + accumulation was observed to be almost 4 % of total cations, and their Na + /K + ratios were as high as 30 at seawater level salinity (Naidoo and Rughunanan 1990 ).…”

Section: Na + /K + Discriminationmentioning

confidence: 99%

Elucidation of Abiotic Stress Signaling in Plants

2015

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The above image represents a depiction of activation of different signaling pathways by diverse stimuli that converge to activate intricate signaling and interaction networks to counter stress (top panel). Since environmental stresses infl uence most signifi cantly to the reduction in potential crop yield, progress is now largely anticipated through functional genomics studies in plants through the use of techniques such as large-scale analysis of gene expression pattern in response to stress and construction, analysis and use of plant protein interactome networks maps for effective engineering strategies to generate stress tolerant crops (top panel). The molecular aspects of these signaling pathways are extensively studied in model plant Arabidopsis thaliana and crop plant rice ( Oryza sativa ) (below).

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SALT TOLERANCE IN THE HALOPHYTE SUAEDA MARITIMA (L.) DUM.

Cited by 32 publications

References 23 publications

Revealing mechanisms of salinity tissue tolerance in succulent halophytes: A case study for Carpobrotus rossi

Revealing mechanisms of salinity tissue tolerance in succulent halophytes: A case study for Carpobrotus rossi

Salt Adaptation Mechanisms of Halophytes: Improvement of Salt Tolerance in Crop Plants

Elucidation of Abiotic Stress Signaling in Plants

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