Agave Seed Endophytes: Ecology and Impacts on Root Architecture, Nutrient Acquisition, and Cold Stress Tolerance

Martínez-Rodríguez, América; Macedo-Raygoza, Gloria; Huerta-Robles, Aurora; Reyes-Sepulveda, Ileana; Lozano-Lopez, Jhovana; García-Ochoa, Evelyn Y.; Fierro-Kong, Luis; Medeiros, Marisa Helena Gennari de; Mascio, Paolo Di; White, James F.; Beltrán-García, Miguel J.

doi:10.1007/978-3-030-10504-4_8

Cited by 18 publications

(16 citation statements)

References 91 publications

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“…Over this period, arid adapted species decreased their distribution area and became isolated into smaller populations or refugia, increasing their population differentiation ( Scheinvar et al, 2017 ). It has been shown that physiological and morphological strategies allow Agaves to survive under extreme temperature conditions ( Nobel and Smith, 1983 ; Martinez-Rodriguez et al, 2019 ). Afterward, the species appears to have experienced a significant range expansion during the LGM (∼21 kya), when the climate became drier and colder ( Caballero et al, 2010 ), with a contraction in the MH and remaining stable until the present.…”

Section: Discussionmentioning

confidence: 99%

Phylogeography and Genetic Diversity in a Southern North American Desert: Agave kerchovei From the Tehuacán-Cuicatlán Valley, Mexico

et al. 2020

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Aguirre-Planter et al. Phylogeography of a Tropical Agave seems to be stable since the middle Holocene (6 kya). We conclude that in A. kerchovei there is a core group of populations in the Tehuacán Valley, and peripheric populations that appear to be evolving independently and thus the species is fundamentally an endemic species from the Tehuacán Valley while the populations outside the Valley appear to be in the process of incipient speciation.

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Section: Discussionmentioning

confidence: 99%

Phylogeography and Genetic Diversity in a Southern North American Desert: Agave kerchovei From the Tehuacán-Cuicatlán Valley, Mexico

et al. 2020

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“…Proteobacteria, as a group of microbes responding to unstable carbon sources, was found to be the most abundant in some other cave ecosystems and various environments as well [25,[34][35][36][37]. The Firmicutes was the second abundant phylum found in soil samples in Zhijin cave, possibly due to their resistance towards nutrient stress and capability of survival under most extreme habitats [25,38]. For other bacteria groups found in samples, the Actinobacteria is considered as the production source of bioactive compounds, but knowledge of their diversities in caves is very limited [4].…”

Section: Composition Of Bacterial Community In Different Sample Typesmentioning

confidence: 99%

Co-occurrence pattern and function prediction of bacterial community in Karst cave

Dong

Gao

et al. 2020

BMC Microbiol

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Background: Karst caves are considered as extreme environments with nutrition deficiency, darkness, and oxygen deprivation, and they are also the sources of biodiversity and metabolic pathways. Microorganisms are usually involved in the formation and maintenance of the cave system through various metabolic activities, and are indicators of changes environment influenced by human. Zhijin cave is a typical Karst cave and attracts tourists in China. However, the bacterial diversity and composition of the Karst cave are still unclear. The present study aims to reveal the bacterial diversity and composition in the cave and the potential impact of tourism activities, and better understand the roles and co-occurrence pattern of the bacterial community in the extreme cave habitats. Results: The bacterial community consisted of the major Proteobacteria, Actinobacteria, and Firmicutes, with Proteobacteria being the predominant phylum in the rock, soil, and stalactite samples. Compositions and specialized bacterial phyla of the bacterial communities were different among different sample types. The highest diversity index was found in the rock samples with a Shannon index of 4.71. Overall, Zhijin cave has relatively lower diversity than that in natural caves. The prediction of function showed that various enzymes, including ribulosebisphosphate carboxylase, 4-hydroxybutyryl-CoA dehydratase, nitrogenase NifH, and Nitrite reductase, involved in carbon and nitrogen cycles were detected in Zhijin cave. Additionally, the modularity indices of all co-occurrence network were greater than 0.40 and the species interactions were complex across different sample types. Cooccurring positive interactions in the bacteria groups in different phyla were also observed. Conclusion: These results uncovered that the oligotrophic Zhijin cave maintains the bacterial communities with the diverse metabolic pathways, interdependent and cooperative coexistence patterns. Moreover, as a hotspot for tourism, the composition and diversity of bacterial community are influenced by tourism activities. These afford new insights for further exploring the adaptation of bacteria to extreme environments and the conservation of cave ecosystem.

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“…In addition, Elymus dahuricus were also enriched with the bacteria Sphingomonas (25%). Both the bacteria Bacillus and Sphingomonas were considered as beneficial taxa [53]. In addition, the Tax4fun prediction also indicated a lower rate of metabolic activity and a higher ability of spore-forming within the bacterial cells of Elymus sibiricus…”

Section: Differences In Fungal Communities Across Grass Speciesmentioning

confidence: 99%

“…Rational use of the plant microbiome has the potential to improve the adaption and yield of important agronomical crops [57]. Both Bacillus and Pantoea were reported to have function of Plant growth promotion, antifungal, IAA production and osmotic stress tolerance [53]. It was also reported that the diversity of communities and the relative abundance of specific taxa influence the effects of biocontrol strains [56].…”

Section: Differences In Fungal Communities Across Grass Speciesmentioning

confidence: 99%

“…The beneficial taxa Pantoea was also enriched in Trifolium repens (11%), Trifolium pretense (27%) and Medicago sativa (36%). Although the Vicia villosa seeds harbored lower Pantoea (2%), it has a wealth of other beneficial taxa like Acinetobacter (8%)[53] and Sphingomonas (5%). In addition, the Non-pathogenic fungus Candida was also enriched in Trifolium repens (14%) and Vicia villosa (31%).…”

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Seed-resident microbiomes of leguminous and gramineous grasses are related to host stress tolerance

Dai¹,

Li²,

Wang³

et al. 2019

Preprint

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Background: The grasses in adverse environment such as Qinghai-Tibet Plateau are hypothesized to survive the harsh climate in part upon their seed-borne microorganisms, and yet the characteristics of the grass seed microbial communities remain undetermined. Here, we assessed the seed microbial communities of three native gramineous grass species (Avena sativa, Elymus sibiricus and Elymus dahuricus) and four candidate legumes (Vicia villosa, Trifolium repens, Trifolium pretense and Medicago sativa) on the Qinghai-Tibet Plateau by high-throughput sequencing. Results: A total of 1,013 bacterial operational taxonomic units (OTUs) and 922 fungal OTUs were observed. The OTUs that shared in all the samples were in high abundance but with different relative abundances. The majority of bacterial sequences were assigned to Proteobacteria (54~90%) and Firmicutes (5~41%), and the fungal communities were mainly composed of Ascomycota (23~96%) and Basidiomycota (2~11%). The fungal communities were more affected by host genetic distance than bacteria. The three gramineous grasses were speculated to survive the adversity partly due to their high abundance of beneficial bacteria like Pantoea or Bacillus, and non-pathogenic fungi like Candida or unclassified Helotiaceae. Also enriched with these potential beneficial taxa, the four leguminous grasses may be competent to adapt the Qinghai-Tibet Plateau stress. Furthermore, the higher tolerance grasses (Elymus sibiricus and Elymus dahuricus) possessed a greater number of growth-promoting and tolerance bacterial and non-pathogenic fungi. Conversely, the less tolerance grass Medicago sativa contained lower levels of such microorganisms, and showed higher abundance of pathogenic taxa. Furthermore, the isolated Bacillus subtilis or Pantoea agglomerans could more probably promote seeding growth of hosts with lower abundance of them, while inhibit if the endo-abundance of was high. Conclusions: Seed-resident microbiome structure of the four cold-tolerance legumes and three Qinghai-Tibet Plateau gramineae is host dependent and related to stress resistance. It also has a strong influence on the response of seedlings to biological seed treatments. This study provides valuable data for studying plant resilience, identifying more biocontrol strains, maximizing microbial functions in ‘smart farming’ practices.

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Agave Seed Endophytes: Ecology and Impacts on Root Architecture, Nutrient Acquisition, and Cold Stress Tolerance

Cited by 18 publications

References 91 publications

Phylogeography and Genetic Diversity in a Southern North American Desert: Agave kerchovei From the Tehuacán-Cuicatlán Valley, Mexico

Phylogeography and Genetic Diversity in a Southern North American Desert: Agave kerchovei From the Tehuacán-Cuicatlán Valley, Mexico

Co-occurrence pattern and function prediction of bacterial community in Karst cave

Seed-resident microbiomes of leguminous and gramineous grasses are related to host stress tolerance

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