Synergistic application of Pseudomonas strains and compost mitigates lead (Pb) stress in sunflower (Helianthus annuus L.) via improved nutrient uptake, antioxidant defense and physiology

Ayub, Aqsa; Shabaan, Muhammad; Malik, Mehreen; Asghar, Hafiz Naeem; Zulfiqar, Usman; Ejaz, Mukkaram; Alarjani, Khaloud Mohammed; Al Farraj, Dunia A.

doi:10.1016/j.ecoenv.2024.116194

Cited by 1 publication

(1 citation statement)

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“…Intensive industrialization and urbanization have significantly raised heavy metal (HM) contamination in soils, which is a major concern globally [ 1 ]. Heavy metals perist in soil for a longer time period and are transferred to human body after their entrance in food chain causing multiple deformities and diseases [ 2 ]. Nickel (Ni) is the 24th most abundant element in earth’s crust (3%) after silicon (Si), magnesium (Mg), oxygen (O) and iron (Fe), and ranks as 5th most abundant element on weight basis [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Exploring the synergistic effects of indole acetic acid (IAA) and compost in the phytostabilization of nickel (Ni) in cauliflower rhizosphere

Khan,

Sarwar,

Shabaan

et al. 2024

BMC Plant Biol

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Heavy metals (HMs) contamination, owing to their potential links to various chronic diseases, poses a global threat to agriculture, environment, and human health. Nickel (Ni) is an essential element however, at higher concentration, it is highly phytotoxic, and affects major plant functions. Beneficial roles of plant growth regulators (PGRs) and organic amendments in mitigating the adverse impacts of HM on plant growth has gained the attention of scientific community worldwide. Here, we performed a greenhouse study to investigate the effect of indole-3-acetic acid (IAA @ 10− 5 M) and compost (1% w/w) individually and in combination in sustaining cauliflower growth and yield under Ni stress. In our results, combined application proved significantly better than individual applications in alleviating the adverse effects of Ni on cauliflower as it increased various plant attributes such as plant height (49%), root length (76%), curd height and diameter (68 and 134%), leaf area (75%), transpiration rate (36%), stomatal conductance (104%), water use efficiency (143%), flavonoid and phenolic contents (212 and 133%), soluble sugars and protein contents (202 and 199%), SPAD value (78%), chlorophyll ‘a and b’ (219 and 208%), carotenoid (335%), and NPK uptake (191, 79 and 92%) as compared to the control. Co-application of IAA and compost reduced Ni-induced electrolyte leakage (64%) and improved the antioxidant activities, including APX (55%), CAT (30%), SOD (43%), POD (55%), while reducing MDA and H2O2 contents (77 and 52%) compared to the control. The combined application also reduced Ni uptake in roots, shoots, and curd by 51, 78 and 72% respectively along with an increased relative production index (78%) as compared to the control. Hence, synergistic application of IAA and compost can mitigate Ni induced adverse impacts on cauliflower growth by immobilizing it in the soil.

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Section: Introductionmentioning

confidence: 99%