Photosynthetica 2020, 58(5):1078-1089 | DOI: 10.32615/ps.2020.030

Ecophysiological study of SiK impact on Castanea sativa Mill. tolerance to drought stress

A. CARNEIRO-CARVALHO1, R. ANJOS1, J. LOUSADA1, T. MARQUES2, T. PINTO1, J. GOMES-LARANJO1
1 CITAB - Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Tras-os-Montes and Alto Douro (UTAD), Vila Real, Portugal
2 Student of Biochemistry, University of Trás-os-Montes and Alto Douro (UTAD), Vila Real, Portugal

Drought is an abiotic stress that may be aggravated by climate changes with increasingly warmer and drier summers. This is a severe problem in the chestnut crop in Portugal due to its need for water during this time, which is essential for good formation and development of the fruit. Si fertilization is referenced by several authors as important in the tolerance of plants under drought. The experiments were carried out in the field trial and chestnuts were fertilized with 0, 5, 7.5, and 10 mM potassium silicate (SiK), which was applied to the soil and to the leaves and exposed to a non-irrigation and an irrigation phase during the summer. Results indicate that Si fertilization increased the relative water content and water potential, while the transpiration rate, stomatal conductance, and stomatal density were reduced under deficit irrigation in Si-treated plants (10 mM SiK). Moreover, the Si induces a higher photosynthetic activity and vessel frequency with a smaller diameter, promoting a higher relative hydraulic conductivity and a lower vulnerability to cavitation. This work suggests that Si can be used as a potential source to induce drought tolerance in chestnuts.

Additional key words: phytoliths; transpiration; water stress; water uptake.

Received: August 17, 2019; Revised: February 25, 2020; Accepted: March 25, 2020; Prepublished online: September 15, 2020; Published: December 8, 2020  Show citation

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CARNEIRO-CARVALHO, A., ANJOS, R., LOUSADA, J., MARQUES, T., PINTO, T., & GOMES-LARANJO, J. (2020). Ecophysiological study of SiK impact on Castanea sativa Mill. tolerance to drought stress. Photosynthetica, 58(5), 1078-1089. doi: 10.32615/ps.2020.030
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