Role of Local Biofertilizer in Enhancing the Oxidative Stress Defence Systems of Date Palm Seedling (Phoenix dactylifera) against Abiotic Stress

Abstract

Among the abiotic stresses, drought is the first environmental stress responsible for a decrease in agricultural production worldwide; it affects plants in various ways, including slowing down plant growth and disrupting its general physiology. Arbuscular mycorrhizal symbiosis and plant growth-promoting rhizobacteria (PGPR) are considered to be the bioameliorators of the plant’s resistance to water stress. The present study investigated the effects of inoculation with arbuscular mycorrhizal fungi (AMF) and PGPR on the water status and antioxidant enzyme activities of date palm seedlings grown under water stress conditions. The parameters related to the plant’s water status were significantly ( p < 0.05 ) higher in the plants treated with mycorrhizae and mycorrhizae + bacteria compared with their respective controls, especially under water stress conditions. The maximum proline content was obtained in plants inoculated with the AMF species and PGPR (combined) under severe water stress conditions reaching a value of 2.588 ± 0.034 in 25% field capacity, compared with 0.978 ± 0.024 for the control. In addition, the inoculated seedlings showed notably lower activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), and glutathione S-transferase (GST) in response to severe water stress compared with nonmycorrhizal seedling. Overall, the arbuscular mycorrhizal symbiosis and PGPR bacteria inoculation could be promising methods to enhance date palm resistance against oxidative stress.

Natural soil biotin application activates soil beneficial microorganisms to improve the thermotolerance of Chinese cabbage

“…Moreover, the application of NSBS pretreatment resulted in enhanced activity of antioxidant enzymes (SOD and POD) in Chinese cabbage leaves exposed to high temperatures ( Figure 7 ). This finding is consistent with previous research demonstrating the beneficial impact of biofertilizer application on bolstering oxidative stress defense mechanisms in date palm seedlings under abiotic stress conditions ( Harkousse et al, 2021 ), indicating that NSBS application may offer a promising approach to fortify date palm resistance against oxidative stress. The sustained activity of antioxidant enzymes (SOD and POD) by NSBS pretreatment is particularly noteworthy.…”

Harnessing rhizospheric core microbiomes from arid regions for enhancing date palm resilience to climate change effects

“…They induce systemic tolerance by triggering a series of biochemical and physiological responses. In this respect, Harkousse et al (2021) reported that inoculation with a consortium composed of 28 species of rhizosphere AMF, collected from an oasis palm grove, improved the relative water content of the leaves of stressed date palm plants and increased their proline content, a fundamental osmoregulation solute (Liang et al, 2013). Next to this, Anli et al (2020) reported that the co-inoculation with plant growth-promoting rhizobacteria and AMF (composed of Sclerocystis sp., Acaulospora sp., and Glomus sp.)…”

“…The release of exotic species into the rhizosphere of date palms risks disrupting their ecological balance, which would make indigenous communities less competitive and therefore more vulnerable compared to exogenous species. Therefore, the isolation and screening of pre-adapted dryland microorganisms should take into consideration both PGP and ecological criteria, which means strains that are both functional and have increased environmental adaptation potentials (Mefteh et al, 2018;Ben Zineb et al, 2019a;Toubali et al, 2020;Harkousse et al, 2021). Furthermore, due to sampling constraints, extensive niche specialization, and the low adaptability of conventional cultural practices, many date palm microorganisms were neglected in terms of cultivation and characterization in the laboratory (Bull et al, 2016).…”

“…Microbes play crucial roles in the rhizosphere of date palm, contributing to its overall health and nutrient availability. Indeed, several investigations have uncovered a wide spectrum of interactions between plant growth-promoting (PGP) microbes and date palm, including the promotion of shoot and root growth (Cherif et al, 2015), inducing systemic tolerance against abiotic stresses (Harkousse et al, 2021), as well as the inhibition of some pathogenic fungi (Siala et al, 2016). In light of this, date palm sustainability can be met through the intelligent use of native plant microbiomes, which boost plant potential to adapt and survive under intense abiotic stresses (Koziol et al, 2018;Qiu et al, 2019;Alsharif et al, 2020).…”

Biostimulants as Innovative Tools to Boost Date Palm (Phoenix dactylifera L.) Performance under Drought, Salinity, and Heavy Metal(Oid)s’ Stresses: A Concise Review

“…On the other hand, ref. [89] noted that PGPR contributed to decreasing the leaf's CAT activity in seedlings of date palm subjected to severe water stress. PGPR contribute to attenuating the effects of drought stress by modifying the root system, implying the root's architecture, depth, angle, density, volume, and biomass.…”