Qadir Muhammad, Hussain Anwar, Shah Mohib, Hamayun Muhammad, Iqbal Amjad, Irshad Muhammad, Ahmad Ayaz, Alrefaei Abdulwahed Fahad, Ali Sajid
Department of Botany, Abdul Wali Khan University, Mardan, Pakistan.
Department of Food Science and Technology, Abdul Wali Khan University, Mardan, Pakistan.
Front Plant Sci. 2024 Jun 17;15:1391348. doi: 10.3389/fpls.2024.1391348. eCollection 2024.
Arsenate, a metalloid, acting as an analog to phosphate, has a tendency to accumulate more readily in plant species, leading to adverse effects.
In the current study, sunflower seedlings were exposed to 25, 50 and 100 ppm of the arsenic.
Likewise, a notable reduction (p<0.05) was observed in the relative growth rate (RGR) by 4-folds and net assimilation rate (NAR) by 75% of when subjected to arsenic (As) stress. Nevertheless, the presence of , a plant growth-promoting rhizobacterium with As tolerance, yielded an escalation in the growth of within As-contaminated media. facilitated the conversion of As into a form accessible to plants, thereby, increasing its uptake and subsequent accumulation in plant tissues. encouraged the enzymatic antioxidant systems (Superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxidase (APX) and catalase (CAT)) and non-enzymatic antioxidants (flavonoids, phenolics, and glutathione) in seedlings following substantial As accumulation. The strain also induced the host plant to produce osmolytes like proline and sugars, mitigating water loss and maintaining cellular osmotic balance under As-induced stress. rectified imbalances in lignin content, reduced high malonaldehyde (MDA) levels, and minimized electrolyte leakage, thus counteracting the toxic impacts of the metal.
The strain exhibited the capability to concurrently encourage plant growth and remediate Ascontaminated growth media through 2-folds rate of biotransformation and bio-mobilization.
砷酸盐作为一种类金属,可作为磷酸盐的类似物,更容易在植物物种中积累,从而产生不利影响。
在本研究中,向日葵幼苗暴露于25、50和100 ppm的砷中。
同样,在砷胁迫下,相对生长率(RGR)显著降低(p<0.05),降低了4倍,净同化率(NAR)降低了75%。然而,耐砷的植物促生根际细菌的存在使受砷污染培养基中的植物生长有所增加。它促进了砷向植物可利用形式的转化,从而增加了植物对砷的吸收及其在植物组织中的积累。在大量砷积累后,它促进了向日葵幼苗中的酶促抗氧化系统(超氧化物歧化酶(SOD)、过氧化物酶(POD)、抗坏血酸过氧化物酶(APX)和过氧化氢酶(CAT))和非酶促抗氧化剂(类黄酮、酚类和谷胱甘肽)。该菌株还诱导宿主植物产生脯氨酸和糖类等渗透调节物质,减少水分流失,并在砷诱导的胁迫下维持细胞渗透平衡。它纠正了木质素含量的失衡,降低了高丙二醛(MDA)水平,并使电解质渗漏最小化,从而抵消了金属的毒性影响。
该菌株具有通过2倍的生物转化和生物活化速率同时促进植物生长和修复受砷污染生长培养基的能力。