Background: Drought constitutes a major abiotic stress factor adversely affecting plant growth and productivity. Plant-microbe symbiotic associations have evolved regulatory mechanisms to adapt to environmental stress conditions. However, the interactive effects of different fungi on host growth and stress tolerance under drought conditions remain unclear.
Objective: This study explored the effects of varying polyethylene glycol (PEG-6000) concentrations (0%, 15%, 25%, and 35%) on the growth and physiological responses of two ectomycorrhizal fungi ( (Sg) and (Pt)) and two dark septate endophytes ( (Po) and sp. (Ps)) isolated from the root system of . Specifically, the study aimed to evaluate six inoculation treatments, including no inoculation (CK), single inoculations with Sg, Pt, Po, Ps, and a mixed inoculation (Sg: Pt : Po: Ps = 1:1:1:1), on the growth and physiological characteristics of seedlings under different water regimes: well-watered at 70% ± 5%, light drought at 50% ± 5%, and severe drought at 30% ± 5% of the maximum field water holding capacity.
Results: All four fungi exhibited the capacity to cope with drought stress by enhancing antioxidant activities and regulating osmotic balance. Upon successful root colonization, they increased plant height, shoot biomass, root biomass, total biomass, and mycorrhizal growth response in seedlings. Under drought stress conditions, fungal inoculation improved seedling drought resistance by increasing superoxide dismutase and catalase activities, free proline and soluble protein contents, and promoting nitrogen and phosphorus uptake. Notably, mixed inoculation treatments significantly enhanced antioxidant capacity, osmotic adjustment, and nutrient acquisition abilities, leading to superior growth promotion effects under drought stress compared to single inoculation treatments.
Conclusion: All four fungi tolerated PEG-induced drought stress, with increased antioxidant enzyme activities and osmotic adjustment substances and they promoted the growth and enhanced drought resistance of seedlings.
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http://dx.doi.org/10.3389/fpls.2024.1446437 | DOI Listing |
J Adv Res
December 2024
College of Forestry and Grasslands, Jilin Provincial Key Laboratory of Tree and Grass Genetics and Breeding, Jilin Agriculture University, Changchun 130118, China. Electronic address:
Background: Trehalose is a nonreducing disaccharide containing two glucose molecules linked through an α,α-1,1-glycosidic bond. This unique chemical structure causes trehalose levels to fluctuate significantly in plants under stress, where it functions as an osmoprotectant, enhancing plant resistance to stress. Previous studies have confirmed that the trehalose synthesis pathway is widely conserved across most plants.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
College of Horticulture, Hebei Agricultural University, Baoding, Hebei 071001, China; Research Center of Chinese Jujube, Hebei Agricultural University, Baoding, Hebei 071001, China. Electronic address:
Chinese jujube (Ziziphus jujuba Mill.) exhibits a remarkable resilience to both drought and salinity. Additionally, it is characterized by a high sugar content, with sucrose being the predominant component of its soluble sugars.
View Article and Find Full Text PDFPlant Physiol Biochem
December 2024
College of Enology, Northwest A & F University, Yangling, 712100, Shaanxi, China. Electronic address:
As a new plant hormone, strigolactone not only promotes leaf senescence, inhibits plant branching and regulates root structure, but also plays an important role in abiotic stress resistance. However, little is known about the function of VvCCD7 under abiotic stress, a key gene for the synthesis of strigolactone in grapevine. In this study, VvCCD7 gene was cloned from grape leaves of 'Cabernet Sauvignon'.
View Article and Find Full Text PDFBiosens Bioelectron
December 2024
Laboratory of Agricultural Information Intelligent Sensing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, PR China; Innovation Platform of Micro/Nano Technology for Biosensing, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, 311215, PR China. Electronic address:
Plant electrical signals serve as a medium for long-distance signal transmission and are intricately linked to plant stress responses. High-fidelity acquisition and analysis of plant electrophysiological signals contribute to early stress identification, thereby enhancing agricultural production efficiency. While traditional plant electrophysiology monitoring methods like gel electrodes can capture electrical signals on plant surfaces, which face limitations due to the plant cuticle barrier, impacting signal accuracy.
View Article and Find Full Text PDFJ Plant Physiol
December 2024
Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture and Rural Affairs, College of Horticulture & Landscape Architecture, Northeast Agricultural University, Harbin, 150030, China; National-Local Joint Engineering Research Center for Development and Utilization of Small Fruits in Cold Regions, Northeast Agricultural University, Harbin, 150030, China. Electronic address:
MYB transcription factors exert crucial functions in enhancing plant stress tolerance, which is impacted by soil drought and salinity. In our study, the R2R3-type MYB transcription factor gene LcMYB5 from blue honeysuckle (Lonicera caerulea L.) was successfully cloned and identified, and confirmed its nuclear localization.
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