Emanuil Naila, Akram Muhammad Sohail, Ali Shafaqat, El-Esawi Mohamed A, Iqbal Muhammad, Alyemeni Mohammed Nasser
Department of Botany, Government College University, Faisalabad 38000, Pakistan.
Department of Environmental Sciences and Engineering, Government College University, Faisalabad 38000, Pakistan.
Plants (Basel). 2020 Dec 19;9(12):1806. doi: 10.3390/plants9121806.
The accumulation of cadmium (Cd) in edible plant parts and fertile lands is a worldwide problem. It negatively influences the growth and productivity of leafy vegetables (e.g., spinach, L.), which have a high tendency to radially accumulate Cd. The present study investigated the influences of peptone application on the growth, biomass, chlorophyll content, gas exchange parameters, antioxidant enzymes activity, and Cd content of spinach plants grown under Cd stress. Cd toxicity negatively affected spinach growth, biomass, chlorophyll content, and gas exchange attributes. However, it increased malondialdehyde (MDA), hydrogen peroxide (HO), electrolyte leakage (EL), proline accumulation, ascorbic acid content, Cd content, and activity of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) in spinach plants. The exogenous foliar application of peptone increased the growth, biomass, chlorophyll content, proline accumulation, and gas exchange attributes of spinach plants. Furthermore, the application of peptone decreased Cd uptake and levels of MDA, HO, and EL in spinach by increasing the activity of antioxidant enzymes. This enhancement in plant growth and photosynthesis might be due to the lower level of Cd accumulation, which in turn decreased the negative impacts of oxidative stress in plant tissues. Taken together, the findings of the study revealed that peptone is a promising plant growth regulator that represents an efficient approach for the phytoremediation of Cd-polluted soils and enhancement of spinach growth, yield, and tolerance under a Cd-dominant environment.
镉（Cd）在可食用植物部分和肥沃土地中的积累是一个全球性问题。它对叶菜类蔬菜（如菠菜）的生长和生产力产生负面影响，这类蔬菜具有较高的径向积累镉的倾向。本研究调查了蛋白胨施用对在镉胁迫下生长的菠菜植株的生长、生物量、叶绿素含量、气体交换参数、抗氧化酶活性和镉含量的影响。镉毒性对菠菜的生长、生物量、叶绿素含量和气体交换特性产生负面影响。然而，它增加了菠菜植株中丙二醛（MDA）、过氧化氢（HO）、电解质渗漏（EL）、脯氨酸积累、抗坏血酸含量、镉含量以及超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）等抗氧化酶的活性。外源叶面喷施蛋白胨增加了菠菜植株的生长、生物量、叶绿素含量、脯氨酸积累和气体交换特性。此外，蛋白胨的施用通过提高抗氧化酶的活性降低了菠菜中镉的吸收以及MDA、HO和EL的水平。植物生长和光合作用的这种增强可能是由于镉积累水平较低，这反过来又降低了植物组织中氧化应激的负面影响。综上所述，该研究结果表明蛋白胨是一种有前景的植物生长调节剂，代表了一种在镉主导环境下对镉污染土壤进行植物修复以及提高菠菜生长、产量和耐受性的有效方法。
