Phytohormone-producing fungal endophytes and hardwood-derived biochar interact to ameliorate heavy metal stress in soybeans

This study identifies the potential use of the combined application of hardwood-derived biochar (BC) and phytohormone-producing endophytes for enhancing crop production under heavy metal stress. For this purpose, the endophyte Galactomyces geotrichum WLL1 was isolated from Trapa japonica inhabiting...

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Bibliographic Details
Published in:Biology and fertility of soils 2014-10, Vol.50 (7), p.1155-1167
Main Authors: Waqas, Muhammad, Khan, Abdul Latif, Kang, Sang-Mo, Kim, Yoon-Ha, Lee, In-Jung
Format: Article
Language:English
Subjects:
Agriculture
Agronomy. Soil science and plant productions
biochar
Biological and medical sciences
Biomedical and Life Sciences
biotic stress
Charcoal
cost effectiveness
crop production
endophytes
Fundamental and applied biological sciences. Psychology
Fungi
Galactomyces
Galactomyces geotrichum
Geotrichum
growth chambers
hardwood
Heavy metals
Hormones
immobilization in soil
jasmonic acid
Life Sciences
Original Paper
plant growth
plant tissues
rain
rivers
Soil and water pollution
Soil contamination
Soil science
Soil Science & Conservation
Soybeans
Trapa
Trapa japonica
watersheds
zinc
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Summary:This study identifies the potential use of the combined application of hardwood-derived biochar (BC) and phytohormone-producing endophytes for enhancing crop production under heavy metal stress. For this purpose, the endophyte Galactomyces geotrichum WLL1 was isolated from Trapa japonica inhabiting a Korean river whose rainfall catchment area included an abandoned zinc mine. Pyrolyzed BC derived from pine hardwoods was obtained commercially. Under growth chamber conditions, the combined or individual application of G. geotrichum WLL1 and BC (15 % w/w) significantly improved soybean growth with or without excess Zn (5,253.6 mg kg⁻¹). The beneficial effect of treatments was observed in the low uptake of Zn by different plant tissues and its immobilization in the soil. Biochar and G. geotrichum WLL1 shared their beneficial properties synergistically and improved plant growth characteristics with or without Zn heavy metal stress (HMS). Further, intensive root colonization of G. geotrichum WLL1 in the presence of BC was observed irrespective of HMS. Most interestingly, BC and G. geotrichum WLL1 had a priming effect by inducing systemic resistance in soybeans as revealed by significantly large amounts of jasmonic acid. These properties of BC could be exploited under abiotic and biotic stress. Here, for the first time, the combined application of hardwood-derived BC and phytohormone-producing endophytes is recommended for environmentally friendly and cost-effective crop production under HMS.
ISSN:0178-2762
1432-0789
DOI:10.1007/s00374-014-0937-4