Characterization of culturable bacterial endophytes of switchgrass (<i><scp>P</scp>anicum virgatum </i><scp>L</scp>.) and their capacity to influence plant growth

Xia, Ye; Greissworth, Eliana; Mucci, Curtis; Williams, Mark A.; Bolt, Seth De

doi:10.1111/j.1757-1707.2012.01208.x

Cited by 47 publications

(43 citation statements)

References 42 publications

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“…The Proteobacteria, for example, have diazotrophic bacterial members and could help to explain their greater relative abundance and greater nitrogen fixation potential in Alamo relative to Dacotah. Similarly, the positive association of bacilli with many other taxa within the bacterial network, and its greater abundance in the cultivable community in Alamo compared with Dacotah is consistent with a growth supportive role played by these bacteria (Lopez-Bucio et al, 2007;Nautiyal et al, 2013;Xia et al, 2013;Gagne-Bourque et al, 2015). Presumably, the surrounding taxa that benefit would in return provide resources that support the growth of the bacilli.…”

Section: Plant-microbial Amino Acids In the Root-zonementioning

confidence: 58%

“…A recent study, for example, identified diverse sets of nitrogen-fixing bacteria associated with roots and shoots of switchgrass (Bahulikar et al, 2014). Other studies focused on targeted approaches of using nitrogen-fixing bacterial endophytes to improve productivity across cultivars (Ker et al, 2012;Xia et al, 2013;Lowman et al, 2016). Plant bacterial associations and how they differ among plant species and cultivars can help to understand the interplay of traits important for defining the drivers of a globally significant plant-bacterial function like that of ANF.…”

Section: Introductionmentioning

confidence: 99%

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Microbial communities and diazotrophic activity differ in the root‐zone of Alamo and Dacotah switchgrass feedstocks

et al. 2016

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Nitrogen (N) bioavailability is a primary limiting nutrient for crop and feedstock productivity. Associative nitrogen fixation (ANF) by diazotrophic bacteria in root-zone soil microbial communities have been shown to provide significant amounts of N to some tropical grasses, but this potential in switchgrass, a warm-season, temperate, US native, perennial tallgrass has not been widely studied. 'Alamo' and 'Dacotah' are cultivars of switchgrass, adapted to the southern and northern regions of the United States, respectively, and offer an opportunity to better describe this plant-bacterial association. The nitrogenase enzyme activity, microbial communities, and amino acid profiles in the root-zones of the two ecotypes were studied at three different plant growth stages. Differences in the nitrogenase enzyme activity and free soluble amino acid profiles indicated the potential for greater nitrogen fixation in the high productivity Alamo compared with the lower productivity Dacotah. Changes in the amino acid profiles and microbial community structure (rRNA genes) of the root-zone suggest different plant-bacterial interactions can help to explain differences in nitrogenase activity. PICRUSt analysis revealed functional differences, especially nitrogen metabolism, that supported ecotype differences in root-zone nitrogenase enzyme activity. It is thought that the greater productivity of Alamo increased the belowground flow of carbon into roots and root-zone habitats, which in turn support the high energy demands needed to support nitrogen fixation. Further research is thus needed to understand plant ecotype and cultivar trait differences that can be used to breed or genetically modify crop plants to support root-zone associations with diazotrophs.

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Section: Plant-microbial Amino Acids In the Root-zonementioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Microbial communities and diazotrophic activity differ in the root‐zone of Alamo and Dacotah switchgrass feedstocks

et al. 2016

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“…Gammaproteobacteria have been reported as commonly dominant endophyte in plants [32]. On the other hand, [32], whereas, they have been dominantly detected in several crops as canola [33], banana [34], switch grass [35] and tobacco [36]. The determining factors of Bacilli are still unclear and needs to be explored.…”

Section: Discussionmentioning

confidence: 99%

Diversity and Plant Growth Promoting Ability of Culturable Endophytic Bacteria in Nepalese Sweet Potato

Puri¹,

Dangi²,

Dhungana³

et al. 2018

AiM

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There is no information on Nepalese sweet potato endophytes. We isolated 243 endophytic bacteria belonging to 34 genera in six classes from 12 locations of Nepal. Among them, the predominant classes were Bacilli and Gammaproteobacteria. The principal component analysis revealed that the composition of bacterial classes was unrelated to the environmental parameters of the sampling sites. Regarding their plant growth promoting potentials, 57% of the strains demonstrated indole-3-acetic acid (IAA) producing ability while 5% strains had nitrogen fixing gene (nifH) and acetylene reduction assay (ARA) activity. The representative strains in all six classes showed antagonistic effect against bacterial pathogens while only Bacillus strain showed the effect against fungal pathogen. For endophytic traits, cellulase activity was observed in 5 classes, while pectinase activity was only in Proteobacteria. Fresh weight and vine length of sweet potato increased by inoculating mixed cultures of the isolates from each location.

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“…According to Robinson et al [17], soil nutrient availability can affect the wheat endophytic bacterial community through the plant growth response. Xia et al [64] showed that soil pH plays a role in endophyte community diversity in switchgrass. In the current study, endophytic bacterial community structure was significantly correlated with soil AN, AP, AK, and C/N.…”

Section: Discussionmentioning

confidence: 99%

Changes of Root Endophytic Bacterial Community Along a Chronosequence of Intensively Managed Lei Bamboo (Phyllostachys praecox) Forests in Subtropical China

et al. 2019

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Endophytic bacteria widely exist inside plant tissues and have an important role in plant growth and development and the alleviation of environmental stress. However, little is known about the response of root-associated bacterial endophytes of Lei bamboo (Phyllostachys praecox) to intensive management, which is a common management practice for high bamboo shoot production in subtropical China. In this study, we comparatively investigated the root endophytic bacterial community structures in a chronosequence of intensively managed (5a, 10a, 15a, and 20a) and extensively managed plantations (as control, Con). The results showed that endophytic Proteobacteria was the dominant bacterial phylum in the bamboo roots. Intensive management significantly increased (p < 0.05) the bacterial observed species and Chao1 (except 5a) indices associated with bamboo roots. The relative abundances of Firmicutes, Bacteroidetes, and Actinobacteria (except 15a) in the intensively managed bamboo roots significantly increased (p < 0.05) compared with those in Con, while the relative abundance of Proteobacteria significantly decreased in intensively managed bamboo roots (p < 0.05). The phyla Proteobacteria, Actinobacteria, Bacteroidetes, and Firmicutes were the biomarkers in Con, 5a, 15a, and 20a, respectively. Redundancy analysis (RDA) showed that soil alkali-hydrolysable N (AN), available phosphorus (AP), available K (AK), and total organic carbon (TOC) were significantly correlated (p < 0.05) with the bacterial community compositions. Our results suggest that the root endophytic microbiome of Lei bamboo was markedly influenced by intensive management practices, and the available nutrient status could be the main driving factor for such shifts. Although heavy fertilization in the intensive management system increased the diversity indices, the rapid changes in root endophyte communities and their relevant functions might indicate a high risk for sustainable management.

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Characterization of culturable bacterial endophytes of switchgrass (Panicum virgatum L.) and their capacity to influence plant growth

Cited by 47 publications

References 42 publications

Microbial communities and diazotrophic activity differ in the root‐zone of Alamo and Dacotah switchgrass feedstocks

Microbial communities and diazotrophic activity differ in the root‐zone of Alamo and Dacotah switchgrass feedstocks

Diversity and Plant Growth Promoting Ability of Culturable Endophytic Bacteria in Nepalese Sweet Potato

Changes of Root Endophytic Bacterial Community Along a Chronosequence of Intensively Managed Lei Bamboo (Phyllostachys praecox) Forests in Subtropical China

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