Silicon nanoparticles enhanced the growth and reduced the cadmium accumulation in grains of wheat (Triticum aestivum L.)
Silicon nanoparticles enhanced the growth and reduced the cadmium accumulation in grains of wheat (Triticum aestivum L.)
复制标题
DOI：
10.1016/j.plaphy.2019.04.041
复制
发表时间：
2019-07-01
影响因子：
6.5
通讯作者：
Ahmad, Parvaiz
中科院分区：
文献类型：
--
作者：
Ali, Shafaqat;Rizwan, Muhammad;Ahmad, Parvaiz
硅（Si）在重金属应力下的应用是众所周知的，但硅纳米颗粒（NPs）在金属应力下的应用还没有很好的文献记载。本试验旨在探讨土壤和叶面施用硅纳米粒子对镉毒害下小麦（Triticum aestivum L.）生长和籽粒镉积累的影响。植株在自然环境条件下生长，在生理成熟（播种后124天）后收获。结果表明，相对于对照，喷施氮化硅显著提高了茎、根、穗和籽粒的干生物量，分别提高了24-69%、14-59%、34-87%和31-96%，土壤施氮化硅显著提高了10-51%、11-49%、25-69%和27-74%。氮化硅提高了叶片气体交换特性和叶绿素a、b浓度，降低了叶片的氧化应激，这主要表现在氮化硅处理降低了叶片的电解质泄漏，提高了叶片超氧化物歧化酶和过氧化物酶活性。与对照相比，叶面喷施Si NPs使茎、根和籽粒Cd含量分别降低了16-58%、19-64%和20-82%，而土壤喷施Si NPs使茎、根和籽粒Cd含量分别降低了11-53%、10-59%和22-83%。与对照组相比，Si浓度显著(p
The application of silicon (Si) under heavy metal stress is well known, but the use of Si nanoparticles (NPs) under metal stress in not well documented. Thus, the experiments were performed to investigate the impacts of soil and foliar applied Si NPs on wheat (Triticum aestivum L.) growth and cadmium (Cd) accumulation in grains under Cd toxicity. The plants were grown under natural environmental conditions and were harvested after physiological maturity (124 days after sowing). The results demonstrated that Si NPs significantly improved, relative to the control, the dry biomass of shoots, roots, spikes and grains by 24-69%, 14-59%, 34-87%, and 31-96% in foliar spray and by 10-51%, 11-49%, 25-69%, and 27-74% in soil applied Si NPs, respectively. The Si NPs enhanced the leaf gas exchange attributes and chlorophyll a and b concentrations, whereas diminished the oxidative stress in leaves which was indicated by the reduced electrolyte leakage and enhancement in superoxide dismutase and peroxidase activities in leaf under Si NPs treatments over the control. When compared with the control, the foliar spray of Si NPs reduced the Cd contents in shoots, roots, and grains by 16-58%, 19-64%, and 20-82%, respectively, whereas soil applied Si NPs reduced the Cd concentrations in shoots, roots, and grains by 11-53%, 10-59%, and 22-83%, respectively. In comparison with the control, Si concentrations significantly (p