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Anatomical and Physiological Responses of Four Quinoa Cultivars to Salinity at Seedling Stage


  • Catedra de Fisiologia Vegetal, Facultad de Ciencias Naturales e IML, Miguel Lillo 205, San Miguel de Tucumán, T4000ILI, Tucuman, Argentina
  • Catedra de Fisiologia Vegetal, Facultad de Ciencias Naturales e IML, Miguel Lillo 205, San Miguel de Tucumán, T4000ILI, Tucuman,, India
  • Instituto de Morfologia Vegetal, Fundacon Miguel Lillo, Miguel Lillo 205, San Miguel de Tucumán, T4000ILI, Tucumán, Argentina
  • Instituto Ecología Vegetal, Fundación Miguel Lillo, Miguel Lillo 205, San Miguel de Tucumán, T4000ILI, Tucumán, Argentina
  • Departamento de Producción Vegetal, Facultad de Ciencias Agrarias, Universidad Nacional de Litoral, Kreder 2805, Esperanza 3080, Santa Fe,, Argentina


Objectives: Salinity is one of the most important environmental stress factors that limits both seed germination and
seedling develop. Seedling stage is the most susceptible stage of plants to salt stress. The aim of this work is to study
the effect of salt stress on anatomical and physiological features of cotyledons and roots of the seedlings of four quinoa
cultivars (Witulla, Wariponcho, Pasankalla and CICA). Methods/ Statistical Analysis: Seed germination and seedling
growth was carried out under 0 and 200 mM NaCl during 10 days. Root length and diameter, and root proton extrusion
were measured. Soluble sugars and proline concentrations were determined in both cotyledons and roots. Anatomical
attributes of cotyledons (adaxial and abaxial stomatal area and density, palisade and spongy cell layers, palisade cell
density) and roots (stele diameter and surface, metaxylem vessel diameter) were also analyzed. Findings: Salt stress
caused physiological and anatomical changes in cotyledons and roots. Sucrose, glucose and fructose concentrations were
more affected in cotyledons than in roots of salt-treated seedlings. Proline accumulation was more affected in roots. Saline
stress affected differentially the anatomical attributes of quinoa cultivars. Application/Improvements: Quinoa seedlings
when subjected to salt stress are able to develop a set of anatomical, physiological and biochemical adaptive mechanisms
which seem to occur at different combinations among quinoa cultivars, but giving similar abilities to cope with the excess
of salt and survive under extreme conditions.


Cotyledon, Proline, Quinoa, Root, Salinity, Sugars

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