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Morphophysiological Changes Resulting from the Application of Silicon in Corn Plants Under Water Stress

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Abstract

Silicon (Si) is a beneficial element for plants, the accumulation of which in plant cell walls prevents water loss through transpiration, which may represent an adaptive strategy for coping with drought stress. Future climate change scenarios predict that drought will become an increasingly important stress factor affecting crop productivity. This problem will be exacerbated by the tendency to irrigate crops with excessive amounts of water, a practice that is both environmentally and economically unsustainable. In this study, we aimed to evaluate the agronomic, physiological, and metabolic aspects of Si translocation in corn crops subjected to drought conditions and excess irrigation. The study was organized in a completely randomized factorial scheme, with five concentrations of applied Si and five levels of irrigation. The findings of the study indicated that the application of Si increased plant growth, stomatal density, and bulliform cell diameter, which provide a better balance in water use and photosynthesis, thereby favoring greater Si translocation and, consequently, an increase in the grain production of corn plants. Furthermore, we found that the application of water to the soil equivalent to 130% and 160% of the recommended level (excess water stress) does not increase plant metabolism or grain production, but does increase water consumption and production costs.

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Abbreviations

Si:

Silicon

CaSiO3 :

Calcium silicate

Ψm :

Soil matric potential

kPa:

Kilopascal

%:

Percentages

OM:

Organic matter level

P:

Phosphor

K:

Potassium

Mg:

Magnesium

Ca:

Calcium

Al:

Aluminum

KCl:

Potassium chloride

Zn:

Zinc

Cu:

Copper

S:

Sulphur

B:

Boron

Fe:

Iron

T:

Cation exchange capacity at pH 7.0

t:

Effective cation exchange capacity

m:

Aluminum saturation index

V:

Base saturation index

NC:

Content of Si

NL:

Level of Si

DM:

Leaf dry mass

NT:

Nutrient translocation

TNP:

Total nutrient

WUE:

Efficiency of physiological water use

ITS:

Total stress index

dm3 :

Cubic decimeter

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Acknowledgements

This research had financial supports from Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG/Brazil) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/Brazil).

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Authors and Affiliations

Authors

Contributions

DJM was the advisor of this research. HCB conducted the experiment in the greenhouse and performed physiological, biochemical, and morphological determinations, measured anatomical parameters, and productive. GMM, TFNM, and MFS análises, metodologia, and estatística.

Corresponding author

Correspondence to Douglas José Marques.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Handling Editor: Rhonda Peavy.

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Marques, D.J., Bianchini, H.C., Maciel, G.M. et al. Morphophysiological Changes Resulting from the Application of Silicon in Corn Plants Under Water Stress. J Plant Growth Regul 41, 569–584 (2022). https://doi.org/10.1007/s00344-021-10322-5

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  • DOI: https://doi.org/10.1007/s00344-021-10322-5

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