PDF(Pubmed)
Abstract：
Salinity has become a major environmental concern of agricultural lands, impairing crop production. The current study aimed to examine the role of zinc oxide nanoparticles (ZnO NPs) in reducing the oxidative stress induced by salinity and the overall improvement in phytochemical properties in barley. A total of nine different barley genotypes were first subjected to salt (NaCl) stress in hydroponic conditions to determine the tolerance among the genotypes. The genotype Annora was found as most sensitive, and the most tolerant genotype was Awaran 02 under salinity stress. In another study, the most sensitive (Annora) and tolerant (Awaran 02) barley genotypes were grown in pots under salinity stress (100 mM). At the same time, half of the pots were provided with the soil application of ZnO NPs (100 mg kg-1), and the other half pots were foliar sprayed with ZnO NPs (100 mg L-1). Salinity stress reduced barley growth in both genotypes compared to control plants. However, greater reduction in barley growth was found in Annora (sensitive genotype) than in Awaran 02 (tolerant genotype). The exogenous application of ZnO NPs ameliorated salt stress and improved barley biomass, photosynthesis, and antioxidant enzyme activities by reducing oxidative damage caused by salt stress. However, this positive effect by ZnO NPs was observed more in Awaran 02 than in Annora genotype. Furthermore, the foliar application of ZnO NPs was more effective than the soil application of ZnO NPs. Findings of the present study revealed that exogenous application of ZnO NPs could be a promising approach to alleviate salt stress in barley genotypes with different levels of salinity tolerance.
摘要：
盐度已成为农业用地的主要环境问题，损害作物生产。目前的研究旨在研究氧化锌纳米颗粒（ZnONPs）在减少由盐度引起的氧化应激和大麦植物化学性质的整体改善中的作用。首先在水培条件下对总共9种不同的大麦基因型进行盐（NaCl）胁迫，以确定基因型之间的耐受性。基因型Annora被发现是最敏感的，在盐度胁迫下，最耐受的基因型是Awaran02。在另一项研究中,最敏感（Annora）和耐受性（Awaran02）的大麦基因型在盐分胁迫（100mM）下在盆中生长。同时,一半的花盆提供了土壤施用的ZnONPs（100mgkg-1），另一半盆用ZnONPs(100mgL-1)叶面喷雾。与对照植物相比，盐度胁迫降低了两种基因型的大麦生长。然而,与Awaran02（耐受基因型）相比，在Annora（敏感基因型）中发现大麦生长的减少更大。外源施用ZnONPs可改善盐胁迫,提高大麦生物量,光合作用,和抗氧化酶活性通过减少盐胁迫引起的氧化损伤。然而,在Awaran02中比在Annora基因型中更观察到ZnONP的这种积极作用。此外，叶面施用ZnONPs比土壤施用ZnONPs更有效。本研究的结果表明，外源施用ZnONPs可能是缓解具有不同耐盐性的大麦基因型的盐胁迫的有希望的方法。
