Abdi Neila, Van Biljon Angeline, Steyn Chrisna, Labuschagne Maryke Tine
Department of Plant Science, University of the Free State, Bloemfontein 9301, South Africa.
Plants (Basel). 2022 Jul 15;11(14):1853. doi: 10.3390/plants11141853.
Abiotic constraints such as salinity stress reduce cereal production. Salicylic acid is an elicitor of abiotic stress tolerance in plants. The aim of this study was to investigate the effects of salicylic acid on two bread wheat cultivars (SST806 and PAN3497) grown under salt stress (100 and 200 mM NaCl) in the presence and absence of 0.5 mM salicylic acid. The highest salt concentration (200 mM), in both PAN3497 and SST806, increased the days to germination and reduced the coleoptile and radicle dry weights. The shoot dry weight was reduced by 75 and 39%, root dry weight by 73 and 37%, spike number of both by 50%, spike weight by 73 and 54%, grain number by 62 and 15%, grain weight per spike by 80 and 45%, and 1000 grain weight by 9 and 29% for 200 and 100 mM NaCl, respectively. Salicylic acid in combination with 100 mM and 200 mM NaCl increased the shoot, root, and yield attributes. Salicylic acid increased the grain protein content, especially at 200 mM NaCl, and the increase was higher in SST806 than PAN3497. The macro-mineral concentration was markedly increased by an increase of NaCl. This was further increased by salicylic acid treatment for both SST806 and PAN3497. Regarding micro-minerals, Na was increased more than the other minerals in both cultivars. Mn, Zn, Fe, and Cu were increased under 100 mM and 200 Mm of salt, and salicylic acid application increased these elements further in both cultivars. These results suggested that salicylic acid application improved the salt tolerance of these two bread wheat cultivars.
盐度胁迫等非生物胁迫会降低谷物产量。水杨酸是植物非生物胁迫耐受性的诱导剂。本研究的目的是调查水杨酸对两个面包小麦品种（SST806和PAN3497）在盐胁迫（100和200 mM NaCl）下，有无0.5 mM水杨酸时的影响。在PAN3497和SST806中，最高盐浓度（200 mM）均增加了发芽天数，并降低了胚芽鞘和胚根干重。地上部干重分别降低了75%和39%，根干重降低了73%和37%，两个品种的穗数均减少了50%，穗重分别降低了73%和54%，粒数减少了62%和15%，每穗粒重分别降低了80%和45%，200 mM和100 mM NaCl处理下的千粒重分别降低了9%和29%。水杨酸与100 mM和200 mM NaCl组合提高了地上部、根部和产量性状。水杨酸提高了谷物蛋白质含量，尤其是在200 mM NaCl时，SST806中的增加幅度高于PAN3497。NaCl浓度增加显著提高了大量矿质元素浓度。水杨酸处理对SST806和PAN3497进一步提高了该浓度。关于微量矿质元素，两个品种中Na的增加幅度均大于其他矿质元素。在100 mM和200 mM盐处理下，Mn、Zn、Fe和Cu含量增加，水杨酸处理进一步提高了两个品种中的这些元素含量。这些结果表明，施用水杨酸提高了这两个面包小麦品种的耐盐性。
