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Zea mays L. amylacea from the Lluta Valley (Arica-Chile) tolerates salinity stress when high levels of boron are available

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Abstract

Elevated levels of boron occurring naturally in soil or irrigation waters are detrimental to many crops grown in agricultural regions of the world. If such levels of boron are accompanied by conditions of excessive salinity, as occurs in the Lluta valley in Northern Chile, the consequences can be drastic for crops. A variety of sweet corn from this valley (Zea mays L. amylacea) has arisen as a consequence of practiced seed selection, suggesting that it is extremely tolerant to high salt and boron levels. In the present study, seeds ofZea mays L. amylacea were collected in order to study their physiological mechanisms of tolerance to high levels of NaCl and boron. Concentrations of 100 and 430 mM NaCl and 20 and 40 mg kg−1 boron were imposed as treatments. The plants did not exhibit symptoms of toxicity to either NaCl and boron during the 20 days of treatment. Na+ accumulation was substantial in roots, while boron was translocated to leaves. Boron alleviated the negative effect of salinity on tissue K+ and maintained membrane integrity. The higher values of water potential seem to be related to the capacity of this ecotype to maintain a better relative water content in leaves. Despite the fact that boron enhanced slightly the effect of salinity on CO2 assimilation, no effect on photochemical parameters was observed in this ecotype. Osmotic adjustment allows this ecotype to survive in high saline soils; however the presence of boron makes this strategy unnecessary since boron contributed to the maintenance of cell wall elasticity.

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Abbreviations

A :

net CO2 assimilation rate

Ci :

intercellular CO2 concentration

EC (%):

percentage of electrolyte leakage

ε:

modulus of elasticity at full hydration

Fv/Fm:

maximum quantum yield of PSII

Ψp :

turgor potential

Ψs :

osmotic potential

Ψ 100s :

osmotic potential at full turgor

Ψ 100s - Ψ 100cs :

degree of osmotic adjustment

Ψw :

leaf water potential

g s :

stomatal conductance

qP,qN:

coefficients of photochemical and non-photochemical quenching, respectively

ΦPSII:

quantum fluorescence yield

RWC:

relative water content

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Authors and Affiliations

  1. Facultad de Agromomía, Universidad de Tarapacá, Casilla 6-D, Arica, Chile

    E. I. Bastías

  2. Departamento de Biología Vegetaly Ecología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/EHU, Apdo. 644, E-48080, Bilbao, Vizcaya, Spain

    M. B. González-Moro & C. González-Murua

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  1. E. I. Bastías
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  2. M. B. González-Moro
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Correspondence to E. I. Bastías.

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Bastías, E.I., González-Moro, M.B. & González-Murua, C. Zea mays L. amylacea from the Lluta Valley (Arica-Chile) tolerates salinity stress when high levels of boron are available. Plant Soil 267, 73–84 (2004). https://doi.org/10.1007/s11104-005-4292-y

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