role of xylopodium in Na⁺ exclusion and osmolyte accumulation in faveleira [Cnidoscolus phyllacanthus (d. arg.) Pax et K. Hoffm] under salt stress

The aim of this work was to evaluate physiological and biochemical responses of faveleira under salinity. Plants were grown in nutrient solution containing 0, 50, 100 or 150 mM NaCl. After 8 days of stress, plants were harvested and separated into roots, xylopodium, stem + petiole (SP), and basal, m...

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Bibliographic Details
Published in:Acta physiologiae plantarum 2014-11, Vol.36 (11), p.2871-2882
Main Authors: Oliveira, Mônica Danielly de Mello, Bezerra, Lisiane Lucena, Dantas, Cibelley Vanucia Santana, Voigt, Eduardo Luiz, Maia, Josemir Moura, de Macêdo, Cristiane Elizabeth Costa
Format: Article
Language:English
Subjects:
Agriculture
Biomedical and Life Sciences
Cnidoscolus
free amino acids
Life Sciences
nutrient solutions
Original Paper
petioles
Plant Anatomy/Development
Plant Biochemistry
Plant Genetics and Genomics
plant organs
Plant Pathology
Plant Physiology
potassium
proline
proteins
roots
salinity
salt stress
sodium
sodium chloride
sugars
toxicity
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Summary:The aim of this work was to evaluate physiological and biochemical responses of faveleira under salinity. Plants were grown in nutrient solution containing 0, 50, 100 or 150 mM NaCl. After 8 days of stress, plants were harvested and separated into roots, xylopodium, stem + petiole (SP), and basal, median and apical leaves. Salinity reduced the dry weight of all plant parts, although the indicators of water status were not changed. Salt stress increased the content of Na⁺ in the different plant parts, especially in xylopodium, in which it increased approximately eightfold while the content of K⁺ decreased by approximately 40 % under 150 mM NaCl. As a consequence, the K⁺/Na⁺ ratio decreased in all plant organs. In stressed plants, the content of soluble sugars was increased in the roots, SP and leaf strata and the content of soluble proteins increased in all organs. The content of total free amino acids increased in the roots, SP and apical leaves, while the proline content increased in all organs except in xylopodium. It is suggested that the xylopodium may be involved in a mechanism of exclusion and/or compartmentalization of Na⁺ in faveleira under salinity to avoid ionic toxicity in the leaves.
ISSN:0137-5881
1861-1664
DOI:10.1007/s11738-014-1657-y