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T O Yastreb, Yu V Karpets, Yu E Kolupaev

    Tsitologiia I Genetika
    |November 29, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Nitric oxide (NO) enhances salt tolerance in Arabidopsis plants by boosting antioxidant enzymes and preserving chlorophyll. This protective effect occurs even without salicylate, indicating alternative NO-mediated signaling pathways in plants.

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    Area of Science:

    • Plant Physiology
    • Molecular Biology
    • Biochemistry

    Background:

    • Salt stress significantly impacts plant growth and survival.
    • Nitric oxide (NO) is a signaling molecule involved in plant stress responses.
    • Salicylate pathways are known to mediate plant defense mechanisms.

    Purpose of the Study:

    • To compare the salt resistance of wild-type Arabidopsis (Col-0) and NahG transformants.
    • To investigate the effect of nitric oxide donor (sodium nitroprusside, SNP) on salt tolerance.
    • To elucidate the role of salicylate in NO-induced salt tolerance.

    Main Methods:

    • Arabidopsis thaliana (Col-0 and NahG) were subjected to salt stress (200 mM NaCl).
    • Plants were treated with sodium nitroprusside (SNP), a nitric oxide donor.

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  • Measurements included growth inhibition, oxidative damage, chlorophyll content, antioxidant enzyme activity (superoxide dismutase, guaiacol peroxidase), and proline content.

    • Main Results:

    • NahG transformants exhibited higher basal salt resistance with increased antioxidant enzyme activity, carbohydrates, and anthocyanins.
    • SNP treatment enhanced salt tolerance in both genotypes, reducing growth inhibition and oxidative damage, and preserving chlorophyll.
    • SNP treatment increased superoxide dismutase and guaiacol peroxidase activity in both genotypes under salt stress.
    • SNP reduced proline content in wild-type plants but increased it in NahG transformants under salt stress.

    Conclusions:

    • Arabidopsis wild-type and NahG transformants display distinct protective system functions under salt stress.
    • Nitric oxide enhances salt tolerance in Arabidopsis, potentially through salicylate-independent pathways.
    • NO-mediated induction of protective systems in plants can occur without salicylate involvement.