Effect of salt stress (NaCl) on whole plant CO2-gas exchange in mango

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10 Citations (Scopus)

Abstract

Saline tolerance of mango rootstocks is, or will be, of major importance in many mango growing areas. In four experiments, different, Mangifera species (M. indica L. cv. '13-1' and 'Turpentine', M. zeylanica Hooker f.) were characterized in a controlled environment. During increasing levels of NaCl salinity (15 to 120 mM) physiological description data of whole plant CO 2 gas exchange (CO2 assimilation A, dark respiration RD, root respiration RR and carbon gain cG) were simultaneously recorded over a period of up to one month. At the end of the experiments mineral composition was recorded in various plant parts. Three representative days with 24 measurements for every hour a day were selected in each experiment, snowing that low NaCl concentrations (15 and 30 mM) reduced A and RD six days after the treatments started. After 3 more days and an increase to 60 mM NaCl a significant reduction of A was measured compared to control plants. In another experiment NaCl-salinity reduced A in both rootstock cultivars without clear difference, but M. indica '13-1' had lower RR compared to M. indica 'Turpentine' and higher CG. No significant differences in mineral contents were measured, but M. indica '13-1' had absolute higher Na+, CI- and Ca2+ contents in leaves. M. indica '13-1' compared directly with M. zeylanica showed clear differences. At 60 mM NaCl A was 8 μmol CO2 m-2s-1 in M. zeylanica and only 3 μmol CO2 m-2s-1 in M. indica '13-1'. In M. zeylanica a higher RR was measured. Significant lower Na+ contents were found in roots and young leaves of M. zeylanica as compared to M. indica '13-1'. The K+ contents and K/Na ratio were significantly higher in roots of M. zeylanica. Physiological characterization of whole plant CO2 gas exchange under controlled environment conditions may be a useful tool for plant description. Data indicated only small differences in salt tolerance between M. indica '13-1' and M. indica 'Turpentine'. Promising higher tolerance may exist in M. zeylanica.

Original languageEnglish
Title of host publicationVI International Symposium on Mango
Pages269-276
Number of pages8
Volume509
DOIs
Publication statusPublished - 2000

Publication series

NameActa Horticulturae
Volume509
ISSN (Print)05677572

Keywords

  • Carbon gain
  • CO assimilation
  • Controlled environment
  • Dark respiration
  • Mangifera indica
  • Mangifera zeylanica
  • Root respiration

ASJC Scopus subject areas

  • Horticulture

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  • Cite this

    Schmutz, U. (2000). Effect of salt stress (NaCl) on whole plant CO2-gas exchange in mango. In VI International Symposium on Mango (Vol. 509, pp. 269-276). (Acta Horticulturae; Vol. 509). https://doi.org/10.17660/ActaHortic.2000.509.29