Regulation of Agronomic Traits, Nutrient Uptake, Osmolytes and Antioxidants of Maize as Influenced by Exogenous Potassium Silicate under Deficit Irrigation and Semiarid Conditions

Agronomy

卷:10

WaelN. Hozzein¹  Amr Elkelish²  AhmedM. El-Sawy³  Reham Farag⁴  MohamedF. M. Ibrahim⁴  Hatem Ashour⁴  Gomaa Abd El-Samad⁵  Mohamed Hikal⁶  HanyAbd El-Gawad⁷  AhmedAbou El-Yazied⁷ 

[1] Bioproducts Research Chair, Zoology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;

[2] Botany Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt;

[3] Climate Modification Department, Central Laboratory for Agriculture Climate, Agriculture Research Center, Giza 12411, Egypt;

[4] Department of Agricultural Botany, Faculty of Agriculture, Ain Shams University, Cairo 11566, Egypt;

[5] Department of Agronomy, Faculty of Agriculture, Ain Shams University, Cairo 11566, Egypt;

[6] Department of Biochemistry, Faculty of Agriculture, Ain Shams University, Cairo 11566, Egypt;

[7] Department of Horticulture, Faculty of Agriculture, Ain Shams University, Cairo11566, Egypt;

关键词: drip irrigation;    silicon;    mineral nutrients;    oxidative stress;    osmolytes;    yield;   

DOI  :  10.3390/agronomy10081212

来源: DOAJ

【 摘 要 】

Understanding the link between the protective role of potassium silicate (K₂SiO₃) against water shortage and the eventual grain yield of maize plants is still limited under semiarid conditions. Therefore, in this study, we provide insights into the underlying metabolic responses, mineral nutrients uptake and some nonenzymatic and enzymatic antioxidants that may differ in maize plants as influenced by the foliar application of K₂SiO₃ (0, 1 and 2 mM) under three drip irrigation regimes (100, 75 and 50% of water requirements). Our results indicated that, generally, plants were affected by both moderate and severe deficit irrigation levels. Deficit irrigation decreased shoot dry weight, root dry weight, leaf area index (LAI), relative water content (RWC), N, P, K, Ca, Fe, Zn, carotenoids, grain yield and its parameters, while root/shoot ratio, malondialdehyde (MDA), proline, soluble sugars, ascorbic acid, soluble phenols, peroxidase (POD), catalase (CAT), polyphenol oxidase (PPO), and ascorbate peroxidase (APX) were improved. The foliar applications of K₂SiO₃ relatively alleviated water stress-induced damage. In this respect, the treatment of 2 mM K₂SiO₃ was more effective than others and could be recommended to mitigate the effect of deficit irrigation on maize plants. Moreover, correlation analysis revealed a close link between yield and the most studied traits.

【 授权许可】

Unknown