Titre du document / Document title

Nutritional and osmotic roles of nitrate in a euhalophyte and a xerophyte in saline conditions

Auteur(s) / Author(s)

JIE SONG ^{(1 2)} ; XIAODONG DING ⁽¹⁾ ; GU FENG ⁽¹⁾ ; FUSUO ZHANG ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ College of Resource and Environmental Science, China Agricultural University, Beijing 100094, CHINE
⁽²⁾ College of Life Science, Shandong Normal University, Jinan 250014, CHINE

Résumé / Abstract

• The effects of salinity and nitrogen (N) on growth and the role of NO₃^- in osmotic adjustment in the leaf-succulent euhalophyte Suaeda physophora and the stem-succulent xerophyte Haloxylon persicum were evaluated. • Seedlings were exposed to 1 or 300 mM NaCI in 0.05, 1 or 10 mM NO₃^--N treatments for 24 d. • At 10 mM NO₃^-, 300 mM NaCI had no adverse effect on the concentration of NO₃^-, the content of organic N, and the estimated contribution of NO₃^- to osmotic potential in leaves of S. physophora, but markedly reduced these in stems of H. persicum. At 300 mM NaCl, more NO₃^- but less Cl^- and Na⁺ were involved in osmotic adjustment in leaves of S. physophora compared with that in stems of H. persicum. The contribution of NO₃^- to osmotic potential was much higher in S. physophora, but lower in H. persicum, than that of amino acids at 300 mM NaCl. • The nutritional and osmotic roles of NO₃^--N seem to be more important in the euhalophyte S. physophora than in the xerophyte H. persicum under saline conditions. These characteristics may determine the natural distributions of the two species in saline or arid environments.

Revue / Journal Title

New phytologist   ISSN 0028-646X   CODEN NEPHAV 

Source / Source

2006, vol. 171, n^o2, pp. 357-366 [10 page(s) (article)] (41 ref.)

Langue / Language

Anglais

Editeur / Publisher

Blackwell, Oxford, ROYAUME-UNI  (1902) (Revue)

Mots-clés anglais / English Keywords

Environmental factor ; Arid environment ; Aminoacid ; Plant juvenile growth stage ; Stem ; Plant leaf ; Growth ; Nitrogen ; Salinity ; Xerophyte ; Nitrates ; Nutrition ;

Mots-clés français / French Keywords

Facteur milieu ; Milieu aride ; Aminoacide ; Stade juvénile plante ; Tige ; Feuille végétal ; Croissance ; Azote ; Salinité ; Xérophyte ; Nitrate ; Nutrition ;

Mots-clés espagnols / Spanish Keywords

Factor medio ; Medio árido ; Aminoácido ; Estado juvenil planta ; Tallo ; Hoja vegetal ; Crecimiento ; Nitrógeno ; Salinidad ; Xerófito ; Nitrato ; Nutrición ;

Mots-clés d'auteur / Author Keywords

euhalophyte ; Haloxylon persicum ; NaCI ; NO3- ; osmotic adjustment ; Suaeda physophora ; xerophyte ;

Localisation / Location

INIST-CNRS, Cote INIST : 3019, 35400014241781.0090