Species interactions enhance root allocation, microbial diversity and P acquisition in intercropped wheat and soybean under P deficiency

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Bargaz, AdnaneSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Biosystem och teknologi,Department of Biosystems and Technology,University of Toronto (author)

Species interactions enhance root allocation, microbial diversity and P acquisition in intercropped wheat and soybean under P deficiency

Article/chapterEnglish2017

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Elsevier BV,2017
Elsevier,2024

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LIBRIS-ID:oai:slubar.slu.se:90946
https://res.slu.se/id/publ/90946URI
https://doi.org/10.1016/j.apsoil.2017.08.011DOI

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Language:English

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Belowground interactions in grain legume-cereal intercrops may improve resource acquisition and adaptation to environmental constraints such as phosphorus (P) deficiency. To advance the knowledge of belowground facilitative mechanisms involved in P-deficiency tolerance (root allocation, biochemical and microbial responses), soybean (Glycine max) and wheat (Triticum aestivum) were grown as monocrops and intercrops under P-deficiency and P-sufficiency conditions in soil-filled rhizoboxes. The hypothesis was that intercropping stimulates root microbial diversity, root biomass allocation and P-hydrolyzing acid phosphatases (APase) activity in roots under P-deficient conditions. Total root dry weight (RDW), length, and surface area significantly increased in P-deficient intercropped wheat and soybean. Greater root allocation to deeper soil layers was evident for P-deficient intercropped wheat. Shallow roots of intercropped wheat exhibited highly stimulated APase activity under P-deficient conditions while shallow roots of monocropped soybean exhibited higher APase activity in comparison to deeper roots, irrespective of P treatment. Root fungal diversity was significantly (p < 0.05) higher in intercropped wheat, and was significantly correlated with RDW, root APase activity, shoot P, and soil available P (rho = 0.24, p= 0.01). Root bacterial diversity was higher in both intercrops, and was significantly correlated with RDW and shoot N concentration. The observed shifts in root microbial diversity, root biomass allocation and APase activity provide explanatory mechanisms of relationships between rhizosphere heterogeneity and pathways for increased P acquisition in diversified crops. Advanced belowground metabolomics on root microbial communities are required to reveal the beneficial effect of root microorganisms in associations of different crop species.

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Jensen, Erik SteenSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Biosystem och teknologi,Department of Biosystems and Technology(Swepub:slu)50246 (author)
Carlsson, GeorgSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Biosystem och teknologi,Department of Biosystems and Technology(Swepub:slu)48872 (author)
Sveriges lantbruksuniversitetBiosystem och teknologi (creator_code:org_t)
Sveriges lantbruksuniversitet

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In:Applied Soil Ecology: Elsevier BV120, s. 179-1880929-13931873-0272

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By the author/editor: Bargaz, Adnane; Jensen, Erik Ste ...; Carlsson, Georg

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AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Agricultural Sci ...

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Soil Science

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By the university: Swedish University of Agricultural Sciences

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