Silicon Improves Chilling Tolerance During Early Growth of Maize by Effects on Micronutrient Homeostasis and Hormonal Balances

Frontiers in Plant Science
Narges MoradtalabGuenter Neumann

Abstract

Low soil temperature in spring is a major constraint for the cultivation of tropical and subtropical crops in temperate climates, associated with inhibition of root growth and activity, affecting early growth and frequently plant performance and final yield. This study was initiated to investigate the physiological base of cold-protective effects induced by supplementation with silicon (Si), widely recommended as a stress-protective mineral nutrient. Maize was used as a cold-sensitive model plant, exposed to chilling stress and low root-zone temperature (RZT) during early growth in a lab to field approach. In a pot experiment, 2-weeks exposure of maize seedlings to low RZT of 12-14°C, induced leaf chlorosis and necrosis, inhibition of shoot and root growth and micronutrient limitation (particularly Zn and Mn). These phenotypes were mitigated by seed treatments with the respective micronutrients, but surprisingly, also by Si application. Both, silicon and micronutrient treatments were associated with increased activity of superoxide dismutase in shoot and roots (as a key enzyme for detoxification of reactive oxygen species, depending on Zn and Mn as cofactors), increased tissue concentrations of phenolics, proline, and antioxida...Continue Reading

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Citations

Feb 1, 2021·Journal of Hazardous Materials·Durgesh Kumar TripathiFrancisco J Corpas
May 28, 2021·Plant Physiology and Biochemistry : PPB·B N DevannaRupesh Deshmukh
Aug 3, 2021·The Science of the Total Environment·Vanessa S BrownAlison L Ritchie
Jul 17, 2021·Journal of Experimental Botany·Yaping ZhouFrank Hochholdinger
Aug 21, 2021·Scientific Reports·Kamilla Silva OliveiraPriscila Lupino Gratão

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Methods Mentioned

BETA
environmental stress
atomic absorption spectrometry
membrane filtration

Software Mentioned

WinRHIZO
Plot
Sigma

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