Improvement of the physiological response of barley plants to both Zinc deficiency and toxicity by the application of calcium silicate
Metadata
Show full item recordEditorial
Elsevier
Materia
Barley Organic acids Oxidative stress Phytohormones Silicon Zinc
Date
2022-03-17Referencia bibliográfica
Valeria Paradisone... [et al.]. Improvement of the physiological response of barley plants to both Zinc deficiency and toxicity by the application of calcium silicate, Plant Science, Volume 319, 2022, 111259, ISSN 0168-9452, [https://doi.org/10.1016/j.plantsci.2022.111259]
Sponsorship
Universidad de Granada / CBUAAbstract
An adequate availability of Zinc (Zn) is crucial for plant growth and development given the essentiality of this
element. Thus, both Zn deficiency and Zn toxicity can limit crop yields. In plants, the responses to Zn imbalances
involve important physiological aspects such as reactive oxygen species (ROS) accumulation, phytohormone
balance, tricarboxylic acid cycle (TCA) metabolism, and organic acids (OAs) accumulation. However, a way to
improve tolerance to stresses such as those produced by nutritional imbalances is the application of beneficial
elements such as silicon (Si). In this study, we grew barley plants in hydroponics under Zn deficiency and toxicity
conditions, applying Si in the form of CaSiO3 in order to assess its effectiveness against Zn imbalances. Parameters
related to plant growth, oxidative stress, TCA enzyme activities, phytohormones and OAs accumulation
were analyzed. Both Zn deficiency and toxicity reduced leaf biomass, increased ROS accumulation, and affected
phytohormone and OAs concentrations and TCA enzyme activities. CaSiO3 treatment was effective in counteracting
these effects enhancing Zn accumulation under Zn deficient conditions and limiting its accumulation
under toxic conditions. In addition, this treatment decreased ROS levels, and improved ascorbate/glutathione
and phytohormonal responses, citrate synthase activity, and malate/oxalate ratio. Therefore, this study enhanced
the notion of the efficacy of CaSiO3 in improving tolerance to Zn imbalances.