Microbial Root Symbionts in Plant Production – Getting to the Bottom

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Farming Sustainability".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 1775

Special Issue Editor


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Guest Editor
Faculty of Science and Technology, Free University of Bozen-Bolzano, Universitätsplatz 5-university square, 5, 39100 Bolzano, BZ, Italy
Interests: plant-microbe-soil interactions; ecological intensification; legumes; microbial community assembly; community coalescence; extended phenotypes; holobiont ecology; holobiont ecophysiology; mycorrhizal symbioses; root nodule symbioses; stress alleviation; plant nutrition; resource allocation; eco-evolutionary feedback, selective association; symbiotic preference; domestication; rhizosphere management, change acclimation versus adaptation
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Special Issue Information

Dear Colleagues,

I invite you to contribute to this Special Issue of Agronomy in the section Farming Sustainability. We seek contributions that report context-dependent, below-ground plant–microbe–soil interactions with effects on plant production and symbiotic association and functioning. Particularly welcome are reports of findings from manipulative experiments under close to field conditions, or field surveys with a clear study, sampling, and analytical design, addressing research questions targeted towards mechanistic and putatively causative relationships. Effects on crop plant performance and the agronomic and ecological significance and possible application value should at least be discussed based on existing literature to the topic. Multifactorial experiments and perspectives demonstrating and/or discussing context-dependencies are particularly welcome. Thorough (opinion) reviews with clear messages and offering new conceptual perspectives are considered as well.

The microbial plant symbionts can be mutualists, commensals, parasites, or mixed populations, and combinations of those. Particularly appreciated are reports on the changing symbiotic relationships with the age of the crop and symbiosis, or when growth conditions change.

All contributions must report microbe–crop interactions and address testable mechanistically justified predictions, based on soil biogeochemical, biophysical, or ecophysiological processes. The agronomic study framework and study system must be described to make it possible to understand the agroecological significance of the reported findings. Exceptions may be made, if findings from model systems and from testing ecological theory are interpreted and related to sustainable crop production and plant–microbe–soil management.

We ask the authors to provide sufficient contextual information in the Introduction and Materials and Methods sections to be able to fully appreciate the meaning of reported findings. We encourage interpretation and a critical discussion of study outcomes as to their actual meaning for production (negative, neutral, positive, or variable) under standard agricultural practices or any microbe-conscious cultivation method.

There are no exclusion criteria with respect to employed analytical approaches if those are sound and justified—no matter whether classical or modern. Reciprocally supportive evidence from different analyses is appreciated.

If you are fed up with twisting findings to fit a certain mindset and can share your message based on thorough arguments and sound data and analyses, this Special Issue of Agronomy is just the right place to make your argument and evidence public.

Dr. Hannes A. Gamper
Guest Editor

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Keywords

  • direct and indirect plant-microbe-soil interactions
  • microbe-microbe and microbe-plant competition or facilitation
  • microbial support and control systems
  • root and soil health and functioning
  • plant-microbe-soil feedback
  • biotic soil legacy
  • microbial community (re-)assembly
  • priority effects
  • (co-)dispersal
  • ecological drift
  • ecological divergence
  • biotic homogenisation
  • eco-evolutionary mismatch
  • symbiotic association
  • biological control
  • root-associated microbes
  • mycorrhizal fungi
  • rhizobia
  • endophytes
  • parasites

Published Papers (1 paper)

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Research

10 pages, 541 KiB  
Article
Effects of Inoculating the Diazotrophic Endophyte Bradyrhizobium sp. AT1 on Different Cultivars of Sweet Potato (Ipomoea batatas [L.] Lam.)
by Junko Terakado-Tonooka, Fukuyo Tanaka, Toshihiko Karasawa, Akihiro Suzuki and Yoshinari Ohwaki
Agronomy 2023, 13(4), 963; https://doi.org/10.3390/agronomy13040963 - 24 Mar 2023
Viewed by 1404
Abstract
Owing to the worldwide shortage of nitrogen (N) fertilizers, diazotrophic endophytes have received increasing attention as biofertilizers. In this study, we investigated the inoculation effects of a diazotrophic endophyte (Bradyrhizobium sp. AT1) on three different cultivars of sweet potato (cvs. Beniazuma, Ayamurasaki, [...] Read more.
Owing to the worldwide shortage of nitrogen (N) fertilizers, diazotrophic endophytes have received increasing attention as biofertilizers. In this study, we investigated the inoculation effects of a diazotrophic endophyte (Bradyrhizobium sp. AT1) on three different cultivars of sweet potato (cvs. Beniazuma, Ayamurasaki, and Kokei No. 14) under pot, container, and different field conditions. Following inoculation, the root length was increased in cvs. Beniazuma and Ayamurasaki but suppressed in cv. Kokei No. 14 in pots, filled with a mixture of vermiculite, potting soil, and pearlite. AT1 inoculation also increased shoot growth in cv. Beniazuma and tuber formation in cv. Ayamurasaki in containers filled with vermiculite, potting soil, and light-colored Andosol. In field experiments, carried out at two field sites with the three cultivars, AT1 inoculation increased the growth of cvs. Beniazuma and Ayamurasaki, but it had almost no effect on cv. Kokei No. 14. In addition to growth promotion, inoculation of micropropagated sweet potato cv. Beniazuma with AT1 led to N derived from air (Ndfa) and acetylene reduction activity (ARA) five months after inoculation. Our studies indicate that AT1 inoculation can enhance the growth of sweet potato and promote N2 fixation. Full article
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