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Sci Total Environ

Title:		Influence of Brevibacterium linens RS16 on foliage photosynthetic and volatile emission characteristics upon heat stress in Eucalyptus grandis
Author(s):		Chatterjee P; Kanagendran A; Samaddar S; Pazouki L; Sa TM; Niinemets U;
Address:		"Department of Environmental and Biological Chemistry, Chungbuk National University Cheongju, Chungbuk 28644, Republic of Korea; Department of Microbiology and Molecular Genetics, University of California, Davis, California 95616, USA. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51006, Estonia; FARCE Lab, Institute of Biology, University of Neuchatel, Rue Emile-Argand 11, 2000 Neuchatel, Switzerland. Department of Environmental and Biological Chemistry, Chungbuk National University Cheongju, Chungbuk 28644, Republic of Korea; Department of Land, Air, and Water Resources, University of California, Davis, California 95616, USA. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51006, Estonia; Department of Biology, University of Louisville, Louisville, KY 40292, USA. Department of Environmental and Biological Chemistry, Chungbuk National University Cheongju, Chungbuk 28644, Republic of Korea. Electronic address: tomsa@chungbuk.ac.kr. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51006, Estonia; Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia. Electronic address: ylo.niinemets@emu.ee"
Journal Title:		Sci Total Environ
Year:		2020
Volume:		20191004
Issue:
Page Number:		134453 -
DOI:		10.1016/j.scitotenv.2019.134453
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Heat stress induces secondary metabolic changes in plants, channeling photosynthetic carbon and energy, away from primary metabolic processes, including, growth. Use of ACC (1-aminocyclopropane-1-carboxylate) deaminase containing plant growth promoting bacteria (PGPB) in conferring heat resistance in plants and the role of PGPB, in altering net carbon assimilation, constitutive and stress volatile emissions has not been studied yet. We exposed leaves of Eucalyptus grandis inoculated and non-inoculated with PGPB Brevibacterium linens RS16 to two levels of heat stress (37?ª+ degrees C and 41?ª+ degrees C for 5?ª+min) and quantified temporal changes in foliage photosynthetic characteristics and volatile emission rates at 0.5?ª+h, day 1 and day 5 after the stress application. Heat stress resulted in immediate reductions in dark-adapted photosystem II (PSII) quantum yield (F(v)/F(m)), net assimilation rate (A), stomatal conductance to water vapor (g(s)), and enhancement of stress volatile emissions, including enhanced emissions of green leaf volatiles (GLV), mono- and sesquiterpenes, light weight oxygenated volatile organic compounds (LOC), geranyl-geranyl diphosphate pathway volatiles (GGDP), saturated aldehydes, and benzenoids, with partial recovery by day 5. Changes in stress-induced volatiles were always less in leaves inoculated with B. linens RS16. However, net assimilation rate was enhanced by bacterial inoculation only in the 37?ª+ degrees C treatment and overall reduction of isoprene emissions was observed in bacterially-treated leaves. Principal component analysis (PCA), correlation analysis and partial least squares discriminant analysis (PLS-DA) indicated that different stress applications influenced specific volatile organic compounds. In addition, changes in the expression analysis of heat shock protein 70 gene (DnaK) gene in B. linens RS16 upon exposure to higher temperatures further indicated that B. linens RS16 has developed its own heat resistance mechanism to survive under higher temperature regimes. Taken together, this study demonstrates that foliar application of ACC deaminase containing PGPB can ameliorate heat stress effects in realistic biological settings"
Keywords:		"Brevibacterium/*physiology Carbon-Carbon Lyases Eucalyptus/*physiology *Heat-Shock Response Photosynthesis Plant Development Plant Leaves *Stress, Physiological Volatile Organic Compounds/*analysis ACC deaminase DnaK gene expression Heat stress Isoprene M;"
Notes:		"MedlineChatterjee, Poulami Kanagendran, Arooran Samaddar, Sandipan Pazouki, Leila Sa, Tong-Min Niinemets, Ulo eng 322603/ERC_/European Research Council/International Netherlands 2019/11/02 Sci Total Environ. 2020 Jan 15; 700:134453. doi: 10.1016/j.scitotenv.2019.134453. Epub 2019 Oct 4"