Azzam Clara R, Zaki Safi-Naz S, Bamagoos Atif A, Rady Mostafa M, Alharby Hesham F
Cell Research Department, Field Crops Research Institute, Agricultural Research Center, Giza 12619, Egypt.
Department of Water Relations and Field Irrigation, National Research Centre, Giza 12622, Egypt.
Plants (Basel). 2022 Apr 7;11(8):1004. doi: 10.3390/plants11081004.
There is an urgent need for innovative strategies to raise the performance of environmentally stressed plants. The seeds of single-cross yellow (L.) hybrid Giza-168 were soaked in -(--Ck) or -zeatin-type cytokinin (--Ck) solutions at a concentration of 50 or 40 µM, respectively. Salinity stress was imposed at 0, 75 or 150 mM NaCl 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 --Ck pretreatment and further enhanced by --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 --Ck, --Ck was superior in mitigating the harmful effects of the high HO levels caused by salt stress on the levels of malondialdehyde and ion leakage compared to the control. Under normal or stress conditions, --Ck pretreatment was better than --Ck pretreatment, while both positively affected maize hormonal contents. As a result, --Ck is recommended to enhance the growth and productivity of maize plants by suppressing the effects of oxidative stress caused by saline water irrigation.
迫切需要创新策略来提高环境胁迫下植物的性能。单交黄色（L.）杂交种吉萨 - 168的种子分别浸泡在浓度为50或40 μM的 -（- - Ck）或 - 玉米素型细胞分裂素（- - Ck）溶液中。在用于灌溉的霍格兰营养液（全强度）中施加0、75或150 mM NaCl的盐胁迫。仅150 mM NaCl对总类胡萝卜素含量有负面影响，而75和150 mM NaCl均对生长和产量构成、相对含水量、膜稳定性指数、光化学活性、气体交换、钾和叶绿素含量、钾/钠比以及光合效率有负面影响。然而，与相应对照相比，- - Ck预处理显著改善了所有这些性状，并且 - - Ck预处理进一步增强了这些性状。此外，脯氨酸、可溶性糖、抗坏血酸和谷胱甘肽的含量以及酶促抗氧化活性在两种盐胁迫浓度下均显著升高，并且与对照相比，两种生物刺激剂使其增加得更多。与对照相比，与 - - Ck相比，- - Ck在减轻盐胁迫引起的高HO水平对丙二醛水平和离子渗漏的有害影响方面更具优势。在正常或胁迫条件下，- - Ck预处理优于 - - Ck预处理，而两者均对玉米激素含量有积极影响。因此，建议使用 - - Ck通过抑制盐水灌溉引起的氧化应激影响来提高玉米植株的生长和生产力。
