浓度高于阈值水平的重金属(HM)作为环境污染物,经常威胁全球农业生产力。因此,寻找负担得起和环境可持续的可交付成果来解决这一问题是首要重点。植物激素可以减轻HMs引起的毒性,并积极影响植物的生长。考虑到植物激素的重要性,本研究旨在评估24-表油菜素内酯(24-EBL;10µM)作为种子浸泡处理对玉米生长性能的影响(L.)分别以增加的浓度(50-400mg。kg-1)的铅(Pb)和镉(Cd)。随着金属浓度的增加,生长和植物生物测定标准降低。例如,400mg的Cd。kg-1土壤降低了发芽效率(56%),根(77%)和芽(69%)干重,总叶绿素(64%),和类胡萝卜素含量(45%)。相反,两种HMs都导致幼苗中胁迫生物标志物和抗氧化酶的增加。然而,24-EBL的外源管理显着增强了生长属性,光合色素,脯氨酸,MDA,和抗氧化酶活性,同时减少HMs胁迫对Z.mays的有害影响。例如,24-EBL(10µM)提高了发芽率,根系生物量,chla,chlb,总叶绿素,类胡萝卜素含量分别为16、21、17、34、18和15%,分别,在50毫克。Pb。kg-1土壤处理的Z.mays植物。此外,脯氨酸的数量,MDA,和Z.mays叶子中的抗氧化酶通过24-EBL的应用而有趣且显着降低。将24-EBL应用于Pb和Cd处理的Z.mays时,植物器官中金属的吸收显着减少。最近的发现帮助我们更好地了解24-EBL如何调节Z.mays的生长和发育,以及它如何增强HMs的弹性。这可能会增加使用24-EBL来提高Z.Mays生产率的可能性。因此,本研究结果证实了将种子预浸泡在24-EBL溶液中的潜力,该溶液可以中和Z.mays植物中重金属的毒性作用。因此,建议应用包括24-EBL在内的植物激素去除植物中的重金属胁迫是可持续农业的最佳解决方案。
Heavy metals (HMs) at a concentration above the threshold level act as environmental pollutants and very often threaten the agricultural productivity globally. Finding affordable and environmentally sustainable deliverables to address this issue is therefore a top focus. Phytohormones alleviate the HMs-induced toxicity and positively influence the plant growth. Considering the importance of phytohormones, the present study aimed to assess the effect of 24-epibrassinolide (24-EBL; 10 µM) as seed soaking treatment on growth performance of Zea mays (L.) contaminated separately with increasing concentrations (50-400 mg.kg-1) of lead (Pb) and cadmium (Cd). With increasing metal concentrations, growth and plant biometric criteria were reduced. For instance, Cd at 400 mg.kg-1 soil reduced the germination efficiency (56%), root (77%) and shoot (69%) dry weight, total chlorophyll (64%), and carotenoid content (45%). Contrarily, both HMs caused increase in stress biomarkers and antioxidant enzymes in seedling. However, exogenous administration of 24-EBL significantly enhanced the growth attributes, photosynthetic pigments, proline, MDA, and antioxidant enzyme activity while reducing the harmful effects of HMs stress on Z. mays. For instance, 24-EBL (10 µM) improved the germination percentage, root biomass, chl a, chl b, total chlorophyll, and carotenoid content by 16, 21, 17, 34, 18, and 15%, respectively, in 50 mg.Pb.kg-1 soil-treated Z. mays plants. Furthermore, the amounts of proline, MDA, and antioxidant enzymes in foliage of Z. mays were interestingly and dramatically lowered by 24-EBL application. Uptake of metals in plant organs was significantly reduced when 24-EBL was applied to Pb- and Cd-treated Z. mays. The recent findings help us better understand how 24-EBL regulates growth and development of Z. mays as well as how it boosts HMs\' resilience, which could increase the possibility of employing 24-EBL to increase Z. mays productivity. Thus, the present findings confirmed the potentiality of pre-soaking the seed in 24-EBL solution that neutralizes the toxic effects of heavy metals in Z. mays plants. Therefore, it is suggested that applying phytohormones including 24-EBL in removal of heavy metal stress in plants is the best possible solution in sustainable agriculture.