Soaking Maize Seeds in Zeatin-Type Cytokinin Biostimulators Improves Salt Tolerance by Enhancing the Antioxidant System and Photosynthetic Efficiency

被引:29
作者
Azzam, Clara R. [1 ]
Zaki, Safi-Naz S. [2 ]
Bamagoos, Atif A. [3 ]
Rady, Mostafa M. [4 ]
Alharby, Hesham F. [3 ]
机构
[1] Agr Res Ctr, Field Crops Res Inst, Cell Res Dept, Giza 12619, Egypt
[2] Natl Res Ctr, Dept Water Relat & Field Irrigat, Giza 12622, Egypt
[3] King Abdulaziz Univ, Fac Sci, Dept Biol Sci, Jeddah 21589, Saudi Arabia
[4] Fayoum Univ, Fac Agr, Bot Dept, Al Fayyum 63514, Egypt
来源
PLANTS-BASEL | 2022年 / 11卷 / 08期
关键词
salinity; biostimulants; maize crop; growth and yield components; photosynthetic efficiency; antioxidant system; hormonal content; SALICYLIC-ACID; CIS-ZEATIN; DROUGHT TOLERANCE; SALINITY STRESS; GENE-EXPRESSION; GRAIN-YIELD; GROWTH; WHEAT; PLANTS; PROLINE;
D O I
10.3390/plants11081004
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
There is an urgent need for innovative strategies to raise the performance of environmentally stressed plants. The seeds of single-cross yellow Zea mays (L.) hybrid Giza-168 were soaked in Cis-(c-Z-Ck) or trans-zeatin-type cytokinin (t-Z-Ck) solutions at a concentration of 50 or 40 mu M, respectively. Salinity stress was imposed at 0, 75 or 150 mM NaC1 in the Hoagland nutrient solution (full strength) used for irrigation. The total carotenoids content was negatively affected by only 150 mM NaCl, while both 75 and 150 mM NaCl negatively affected the growth and yield components, relative water content, membrane stability index, photochemical activity, gas exchange, K+ and chlorophyll contents, K+ /Na+ ratio, and photosynthetic efficiency. However, all of these traits were significantly improved by c-Z-Ck pretreatment and further enhanced by t-Z-Ck pretreatment compared with the corresponding controls. Furthermore, the contents of proline, soluble sugars, ascorbate, and glutathione, as well as enzymatic antioxidant activities, were significantly elevated by both salt stress concentrations and increased more by both biostimulators compared to the control. Compared to c-Z-Ck, t-Z-Ck was superior in mitigating the harmful effects of the high H2O2 levels caused by salt stress on the levels of malondialdehyde and ion leakage compared to the control. Under normal or stress conditions, t-Z-Ck pretreatment was better than c-Z-Ck pretreatment, while both positively affected maize hormonal contents. As a result, t-Z-Ck is recommended to enhance the growth and productivity of maize plants by suppressing the effects of oxidative stress caused by saline water irrigation.
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页数:19
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