Salicylic acid ameliorates salinity tolerance in maize by regulation of phytohormones and osmolytes

Salinity is one of the most widespread stresses responsible for water and soil pollution across the globe. Salicylic acid (SA) has a major role in defence responses against various abiotic stresses. In the current study, SA (0.05 mmol) influences were evaluated in mitigation of the negative impact o...

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Published inPlant, soil and environment Vol. 66; no. 10; pp. 533 - 541
Main Author Elhakem, Abeer Hamdy
Format Journal Article
LanguageEnglish
Czech
Published Prague Czech Academy of Agricultural Sciences (CAAS) 01.01.2020
Czech Academy of Agricultural Sciences
Subjects
Abscisic acid
Accumulation
adaptation
Calcium
Calcium ions
Corn
Gibberellic acid
Indoleacetic acid
Mitigation
organic and inorganic solutes
osmoprotectant
Phytochromes
Phytohormones
Proline
Salicylic acid
Salinity
Salinity effects
Salinity tolerance
salt stress
salt-sensitive c4 species
Sodium chloride
Soil pollution
soil salinisation
Soil water
Stresses
Sugar
Toxicity
Water pollution
zea mays l
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Summary:Salinity is one of the most widespread stresses responsible for water and soil pollution across the globe. Salicylic acid (SA) has a major role in defence responses against various abiotic stresses. In the current study, SA (0.05 mmol) influences were evaluated in mitigation of the negative impact of salinity (40 and 80 mmol NaCl) in the maize plant. NaCl stress-induced significant accumulation of organic osmolytes (total soluble sugars (TSS), total soluble protein (TSP), and proline) by 35.6, 66.2, and 89.2%, respectively, with 80 mmol NaCl. In addition, salinity is also responsible for the elevated accumulation of inorganic osmolytes (Na+ and Na+/K+ ratio) by 202.4% and 398.8%, respectively, and for the reduction in the K+ and Ca2+ levels by 48.6% and 58.9%, respectively, with 80 mmol NaCl. Moreover, salinity stress reduced phytohormones (indoleacetic acid (IAA) and gibberellic acid (GA3)) by 48.8% and 59.8%, respectively, with 80 mmol NaCl; however, abscisic acid (ABA) was increased by 340.5% with 80 mmol NaCl. Otherwise, SA application caused an additional enhancement in TSS, TSP, proline, K+, Ca2+, IAA, and GA3 contents but decreased the Na+, Na+/K+ ratio, and ABA to an appreciable level. In conclusion, SA pre-soaking mitigates the negative impact of NaCl toxicity in maize through the regulation of phytochromes and various organic and inorganic osmolytes, which may ameliorate salinity tolerance in maize.
ISSN:1214-1178
1805-9368
DOI:10.17221/441/2020-PSE