Exophiala sp.LHL08 association gives heat stress tolerance by avoiding oxidative damage to cucumber plants

Abstract

Exophiala sp. LHL08, a gibberellin-producing strain, was investigated to assess its effects on cucumber plant growth and heat (40°C) stress tolerance. The results reveal that Exophiala sp. associated plants had significantly higher plant growth attributes (shoot length, plant biomass, chlorophyll contents, and leaf area) than control under heat stress. Endophytic association helped the plants to obtain adequate water to reduce the leaf electrolytic leakage under stress. High-temperature-induced oxidative stress was less pronounced in Exophiala sp. associated plants as shown by enhanced levels of total polyphenol and reduced activities of glutathione, superoxide anion, and lipid peroxidation. To tolerate heat stress and rescue plant growth, the endophyte association significantly increased catalase and peroxidase activities of the host plants as compared to control plants. Contents of palmitic, stearic, oleic, and α-linolenic were significantly decreased in the Exophiala sp.-inoculated plants than control plants under heat stress. Contents of flavonoids like genistein and daidzein were produced in higher quantities, while glycitein content was almost same in endophyte-associated plants under heat stress than control plants. Contrarily, stress-responsive endogenous abscisic acid and jasmonic acid were significantly activated in noninoculated control treatments as compared to endophyteinoculated plants under heat stress. The findings of the study reveal that association of Exophiala sp. with cucumber host plants can modulate heat stress by influencing physiological and biochemical contents of plants under heat stress.

Additive effects due to biochar and endophyte application enable soybean to enhance nutrient uptake and modulate nutritional parameters

“…In the current study, the combination of gibberellin and IAA-producing endophyte (e.g. G. geotrichum) with BC increased fatty acid content; however, various studies obtained the same results for the association of endophytic fungi with their host plants (Khan et al, 2012a;2012b). In these and other studies, the production of secondary metabolites (mainly phytohormones) by endophytes was found to be the main reason for this effect (Khan et al, 2012a;2012b;Jusoh et al, 2015).…”

“…G. geotrichum) with BC increased fatty acid content; however, various studies obtained the same results for the association of endophytic fungi with their host plants (Khan et al, 2012a;2012b). In these and other studies, the production of secondary metabolites (mainly phytohormones) by endophytes was found to be the main reason for this effect (Khan et al, 2012a;2012b;Jusoh et al, 2015). Furthermore, GA production by endophytes (Khan et al, 2012a;2012b) and the exogenous application of IAA (Jusoh et al, 2015) have been reported to modulate fatty acids in plants under normal and stress conditions.…”

“…In these and other studies, the production of secondary metabolites (mainly phytohormones) by endophytes was found to be the main reason for this effect (Khan et al, 2012a;2012b;Jusoh et al, 2015). Furthermore, GA production by endophytes (Khan et al, 2012a;2012b) and the exogenous application of IAA (Jusoh et al, 2015) have been reported to modulate fatty acids in plants under normal and stress conditions. Both types of phytohormones were detected in G. geotrichum and may be factors for the same results being reported.…”

“…For example, endophytes found in plant roots help with water uptake, nutrient acquisition, and plant growth promotion, while those found in the leaves and stems strengthen plant defense mechanisms 2014;Waqas et al, 2014;Hartley et al, 2015;Zhou et al, 2015). Endophytes enhance the performance of host tissue functions by producing a vast array of biologically active secondary metabolites (Khan et al, 2012a;Waqas et al, 2014;. Phytohormones and similar substances are examples of biologically active secondary metabolites, which are mostly responsible for enhancing plant growth and development under normal, abiotic, and biotic stress conditions.…”

A Multifactor Analysis of Fungal and Bacterial Community Structure in the Root Microbiome of Mature Populus deltoides Trees

“…and Mortierella. Some of these organisms are known to have positive benefits to the plants by increasing plant growth, preventing oxidative damage, mitigating salt stress, transferring nitrogen from insect to plant and/or acting as entomopathogens [62], [63]. Neonectria is known as an opportunistic plant pathogen in some environments; however their function within native rhizosphere habitats of P. deltoides remains undefined.…”