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Agave plants, found primarily in arid and semi‐arid regions, have been utilized by indigenous communities for various purposes for thousands of years. They currently serve as crops to produce alcoholic beverages and fibers. Despite their importance, there is limited understanding of the relationship between agave and soil. This article addresses some of the knowledge gaps regarding the interactions and benefits of the agave‐soil approach. Among all the documents reviewed, 153 discussed individual soil parameters (45 physical, 68 chemical, and 40 biological), 59 explored interactions between them, and 130 did not address soil aspects (i.e., soil was merely presented as a substrate for the growth and development of plants and was not examined in the study's findings). Moreover, the historical evolution of the research highlights two distinct periods (from 1985 to 2000 and between 2010 to 2023) of notable publication activity, with recent years witnessing a surge in studies involving soil management techniques, genetic improvement of agave species, bioremediation, and the use of residues for bioenergy, biofuel, and soil amendments. There is a notable increasing trend in diverse research areas interested in these interactions, reflecting a broader recognition of the importance of understanding soil functioning in agave cultivation. Indeed, from 2010 to 2023, the use of the keyword ‘soil’ increased by 96% in studies of agave cultivation. This shift in research trends suggests that scientific advances in agave cultivation and soil science can be expected, contributing to sustainable agriculture and the long‐term viability of agave‐based industries. This article underscores an opportunity for further research to optimize agave cultivation and processing (e.g., soil management and productivity), for different purposes while conserving soil health and promoting sustainable land‐use practices.
Agave plants, found primarily in arid and semi‐arid regions, have been utilized by indigenous communities for various purposes for thousands of years. They currently serve as crops to produce alcoholic beverages and fibers. Despite their importance, there is limited understanding of the relationship between agave and soil. This article addresses some of the knowledge gaps regarding the interactions and benefits of the agave‐soil approach. Among all the documents reviewed, 153 discussed individual soil parameters (45 physical, 68 chemical, and 40 biological), 59 explored interactions between them, and 130 did not address soil aspects (i.e., soil was merely presented as a substrate for the growth and development of plants and was not examined in the study's findings). Moreover, the historical evolution of the research highlights two distinct periods (from 1985 to 2000 and between 2010 to 2023) of notable publication activity, with recent years witnessing a surge in studies involving soil management techniques, genetic improvement of agave species, bioremediation, and the use of residues for bioenergy, biofuel, and soil amendments. There is a notable increasing trend in diverse research areas interested in these interactions, reflecting a broader recognition of the importance of understanding soil functioning in agave cultivation. Indeed, from 2010 to 2023, the use of the keyword ‘soil’ increased by 96% in studies of agave cultivation. This shift in research trends suggests that scientific advances in agave cultivation and soil science can be expected, contributing to sustainable agriculture and the long‐term viability of agave‐based industries. This article underscores an opportunity for further research to optimize agave cultivation and processing (e.g., soil management and productivity), for different purposes while conserving soil health and promoting sustainable land‐use practices.
The use of plant growth-promoting rhizobacteria in crop production necessitates an understanding of the underlying mechanisms. We investigated the potential mechanisms of plant growth promotion by Streptomyces rochei S32 in wheat and tomato crops. MethodsThe effects of S. rochei S32 on plant growth and its antagonistic activity against soil-borne pathogenic fungi were tested in petri dishes. The underlying molecular mechanisms were identi ed based on wholegenome sequencing and bioinformatics analysis. The results of genomic analysis were veri ed by widely targeted metabolomics and mechanism studies of plant growth promotion. ResultsThe growth of crop seedlings treated with the cell-free fermentation broth of S. rochei S32 was markedly improved in 15 d. This effect was demonstrated by increased plant height (24.7%) and root length (17.4%) of wheat (400-fold dilution), as well as extended root length (40.9%) of tomato (200-fold dilution). S. rochei S32 showed antagonistic activity against multiple pathogenic fungi, especially Macropoma kawatsukai. The bacterial genome contains an 8,041,158-bp chromosome and two plasmids. A total of 7486 annotated genes were classi ed into 31 Gene Ontology functional categories. Genomic analysis revealed the potential for the production of indole-3-acetic acid, fungal cell wall hydrolases, antibiotics (e.g., candicidin, streptothricin, borrellin, alba avenone), and siderophores. Thirtynine phytohormones and 2205 secondary metabolites were detected, including indole-3-acetic acid, phytosphingosine, haloprogin, acivicin, and corynebactin. Normal bacterial growth occurred on a nitrogen-free medium. ConclusionS. rochei S32 can promote plant growth directly or indirectly through nitrogen xation and production of phytohormones, extracellular hydrolases, antibiotics, and siderophores.
Aims The use of plant growth-promoting rhizobacteria in crop production necessitates an understanding of the underlying mechanisms. We investigated the potential mechanisms of plant growth promotion by Streptomyces rochei S32 in wheat and tomato crops. Methods The effects of S. rochei S32 on plant growth and its antagonistic activity against soil-borne pathogenic fungi were tested in petri dishes. The underlying molecular mechanisms were identified based on whole-genome sequencing and bioinformatics analysis. The results of genomic analysis were verified by widely targeted metabolomics and mechanism studies of plant growth promotion. Results The growth of crop seedlings treated with the cell-free fermentation broth of S. rochei S32 was markedly improved in 15 d. This effect was demonstrated by increased plant height (24.7%) and root length (17.4%) of wheat (400-fold dilution), as well as extended root length (40.9%) of tomato (200-fold dilution). S. rochei S32 showed antagonistic activity against multiple pathogenic fungi, especially Macropoma kawatsukai. The bacterial genome contains an 8,041,158-bp chromosome and two plasmids. A total of 7486 annotated genes were classified into 31 Gene Ontology functional categories. Genomic analysis revealed the potential for the production of indole-3-acetic acid, fungal cell wall hydrolases, antibiotics (e.g., candicidin, streptothricin, borrellin, albaflavenone), and siderophores. Thirty-nine phytohormones and 2205 secondary metabolites were detected, including indole-3-acetic acid, phytosphingosine, haloprogin, acivicin, and corynebactin. Normal bacterial growth occurred on a nitrogen-free medium. Conclusion S. rochei S32 can promote plant growth directly or indirectly through nitrogen fixation and production of phytohormones, extracellular hydrolases, antibiotics, and siderophores.
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