Stomatal Abundance and Distribution in Prosopis strombulifera Plants Growing under Different Iso-Osmotic Salt Treatments

Abstract

Changes in several environmental parameters are thought to affect stomatal development. Under salt stress, plants can regulate their transpiration flux through a better control of the stomatal opening (as a short-term response) and through modifications of leaf anatomy (as a long-term response). We investigate how leaf micromorphology (stomatal abundance and distribution) of the halophyte Prosopis strombulifera (a spiny shrub particularly abundant in high-salinity areas of central Argentina) responds to different water status when plants are subjected to different salt treatments (NaCl, Na2SO4 and their iso-osmotic mixture). Different salt treatments on P. strombulifera plants influenced leaf micromorphological traits differently. In this study, Na2SO4-treated plants showed an increase in stomatal density (SD) and epidermal cell density (ECD) (with smaller stomata) at moderate and high salinity (-1.9 and -2.6 MPa), whereas in NaCl and NaCl + Na2SO4 treated plants, a decrease in these variables was observed. In Na2SO4-treated plants, transpiration was the highest at moderate and high salinity, with the highest content of ABA registered. A possible explanation is that, despite of these high ABA levels, there is no inhibition in stomatal opening, resulting in increased water loss, growth inhibition, and acceleration of senescence processes. We demonstrate that P. strombulifera responds to progressive salt stress by different salts changing the leaf development, particularly in Na2SO4-treated plants, leading to structural modifications in leaf size and micro-morphology of leaf cells.

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M. Reginato, H. Reinoso, A. Llanes and M. Luna, "Stomatal Abundance and Distribution in Prosopis strombulifera Plants Growing under Different Iso-Osmotic Salt Treatments," American Journal of Plant Sciences, Vol. 4 No. 12C, 2013, pp. 80-90. doi: 10.4236/ajps.2013.412A3010.

Conflicts of Interest

The authors declare no conflicts of interest.

References

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