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Soil Acidification Stimulates the emission of ethylene from Temperate Forest Soils

Advances in Atmospheric Sciences 2009年第6期26卷 1253-1261页

作者：徐星凯 Kazuyuki INUBUSHI State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of Sciences Graduate School of Horticulture Chiba UniversityMatsudo

Soil acidification via acid precipitation is recognized to have detrimental impacts on forest ecosystems, which is in part associated with the function of ethylene released from the soil. However, the impacts of acidification on the cycling of ethylene in forest soils have not been fully taken into consideration in global change studies. Forest topsoils （0-5 cm） under four temperate forest stands were sampled to study the effects of a pH change on the emissions of ethylene and carbon dioxide from the soils and concentrations of dissolved organic carbon （DOC） released into the soils. Increasing acidification or alkalinization of forest soils could increase concentrations of DOC released into the soils under anoxic and oxic conditions. The ethylene emission from these forest topsoils could significantly increase with a decreasing pH, when the soils were acidified experimentally to a pH〈4.0, and it increased with an increasing concentration of DOC released into the soils, which was different from the carbon dioxide emission from the soils. Hence, the short-term stimulating responses of ethylene emission to a decreasing pH in such forest soils resulted from the increase in the DOC concentration due to acidification rather than carbon mineralization. The results would promote one to study the effects of soil acidification on the cycling of ethylene under different forest stands, particularly under degraded forest stands with heavy acid depositions.

关键词： soil acidification carbon dioxide dissolved organic carbon ethylene emission volcanic soil

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Halophile plant growth-promoting rhizobacteria induce salt tolerance traits in wheat seedlings(Triticum aestivum L.)

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Pedosphere 2020年第5期30卷 684-693页

作者： Maryam SAFDARIAN Hossein ASKARl Ghorbanali NEMATZADEH Adriano SOFO Sari Agricultural Sciences and Natural Resources University Mazandaran ProvinceSari ***(Iran) Department of Biotechnology Faculty of New Technologies and Energy EngineeringShahid Beheshti UniversityTehran 198396941(Iran) Department of European and Mediterranean Cultures:Architecture EnvironmentCultural Heritage(DiCEM)Universita degli Studi dello BasilicataVia Lanera 20Matera 75100(Italy)

Salinity is one of the most important growth-limiting factors for most crops in arid and semi-arid regions;however,the use of plant growth-promoting rhizobacteria isolated from saline soils could reduce the effects of saline stress in *** study aimed to evaluate the efficiency of plant growth-promoting rhizobacteria(PGPRs),isolated from the rhizosphere of halophile plants,for the growth,Na^+/K^+balance,ethylene emission,and gene expression of wheat seedlings{Triticum aestivum L.)grown under saline conditions(100 mmol L^-1 NaCl)for 14 d.A total of 118 isolates obtained from saline soils of the deserts of Iran were tested for their capacity as *** of the 118 isolates,17 could solubilize phosphate(Ca3(P〇4)2),5 could produce siderophores,and 16 could synthesize indole-3-acetic ***,PGPRs were also evaluated for aminocyclopropane-l-carboxylate deaminase activity.A pot experiment was conducted to evaluate the ability of 28 PGPR isolates to promote growth,regulate Na^+/K^+balance,and decrease ethylene emissions in *** most efficient PGPRs were Arthrobacter *** atrophaeus,Enterobacter ashuriae,and Pseudomonas *** expression analysis revealed the up-regulation of H^+-PPase,HKT1,NHX7,CAT,and APX expression in roots of Enterobacter-inocuVdied salt-stressed ***-tolerant rhizobacteria exhibiting plant growth-promoting traits can facilitate the growth of wheat plants under saline *** results indicate that the isolation of these bacteria may be useful for formulating new inoculants to improve wheat cropping systems in saline soils.

关键词： ethylene emission gene expression growth-promoting trait indole-3-acetic acid phosphate solubility saline soil siderophore

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