Current Progress in Nitrogen Fixing Plants and Microbiome Research

Mahmud, Kishan; Makaju, Shiva O.; Ibrahim, Razi; Missaoui, Ali

doi:10.3390/plants9010097

Cited by 215 publications

(126 citation statements)

References 155 publications

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“…Among the season-associated Bacteria, WMSS identified the nitrogen-fixing Bradyrhizobium genus [ 77 ], already reported in olive by [ 41 ], the anaerobes Peptoniphilus [ 78 ], which include human pathogenic species, and the Streptomyces genus, whose members are known as bioremediators and plant-growth-promoters [ 79 ]. The only WMSS and 16S/ITS rRNA gene shared genus was Malassezia that was positively associated to plants with high Xylella abundance.…”

Section: Discussionmentioning

confidence: 99%

Differences in the Endophytic Microbiome of Olive Cultivars Infected by Xylella fastidiosa across Seasons

et al. 2020

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The dynamics of Xylella fastidiosa infections in the context of the endophytic microbiome was studied in field-grown plants of the susceptible and resistant olive cultivars Kalamata and FS17. Whole metagenome shotgun sequencing (WMSS) coupled with 16S/ITS rRNA gene sequencing was carried out on the same trees at two different stages of the infections: In Spring 2017 when plants were almost symptomless and in Autumn 2018 when the trees of the susceptible cultivar clearly showed desiccations. The progression of the infections detected in both cultivars clearly unraveled that Xylella tends to occupy the whole ecological niche and suppresses the diversity of the endophytic microbiome. However, this trend was mitigated in the resistant cultivar FS17, harboring lower population sizes and therefore lower Xylella average abundance ratio over total bacteria, and a higher α-diversity. Host cultivar had a negligible effect on the community composition and no clear associations of a single taxon or microbial consortia with the resistance cultivar were found with both sequencing approaches, suggesting that the mechanisms of resistance likely reside on factors that are independent of the microbiome structure. Overall, Proteobacteria, Actinobacteria, Firmicutes, and Bacteriodetes dominated the bacterial microbiome while Ascomycota and Basidiomycota those of Fungi.

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Section: Discussionmentioning

confidence: 99%

Differences in the Endophytic Microbiome of Olive Cultivars Infected by Xylella fastidiosa across Seasons

et al. 2020

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“…Active expressions of the nifH gene were abundantly found in the nitrogen‐fixing sugarcane stems (Dobereiner, 1961), sweet potato stems and storage tubers (Hill et al ., 1982). In a non‐symbiotic system such as rhizosphere‐associative nitrogen fixation, nitrogen‐fixing bacteria fix the nitrogen by using carbon and energy sources supplied from the environment (Mahmud et al ., 2020). Comparison of gene expression patterns suggests differences in N‐cycling processes in C .…”

Section: Discussionmentioning

confidence: 99%

Expression of N‐cycling genes of root microbiomes provides insights for sustaining oilseed crop production

Wang

Gan

Bainard

et al. 2020

Environmental Microbiology

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Summary Agricultural production is dependent on inputs of nitrogen (N) whose cycle relies on soil and crop microbiomes. Crop diversification has increased productivity; however, its impact on the expression of microbial genes involved in N‐cycling pathways remains unknown. Here, we assessed N‐cycling gene expression patterns in the root and rhizosphere microbiomes of five oilseed crops as influenced by three 2‐year crop rotations. The first phase consisted of fallow, lentil or wheat, and the second phase consisted of one of five oilseed crops. Expression of bacterial amoA, nirK and nirS genes showed that the microbiome of Ethiopian mustard had the lowest and that of camelina the highest potential for N loss. A preceding rotation phase of lentil significantly increased the expression of nifH gene by 23% compared with wheat and improved nxrA gene expression by 51% with chemical fallow in the following oilseed crops respectively. Lentil substantially increased biological N2 fixation and reduced denitrification in the following oilseed crops. Our results also revealed that most N‐cycling gene transcripts are more abundant in the microbiomes associated with roots than with the rhizosphere. The outcome of our investigation brings a new level of understanding on how crop diversification and rotation sequences are related to N‐cycling in annual cropping systems.

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“…Bacterial and fungal symbiosis is an essential part of the ecosystem in all tropical forests, and most (indeed, probably all) plants will form at least one type of symbiosis and many will form more than one (James 2017). Nitrogen can be made available by plantassociated bacteria in the soil through nitrogen fixation, that is importantly needed by plant for growing (Mujahid 2015;James 2017;Mahmud et al 2020). Most regions in East Nusa Tenggara, including Sumba Island, have extreme agro-climatic conditions because of the location in an exceedingly distinct semi-arid ecosystem; this has limited the richness of the biodiversity in the area, especially flora (Hendrik et al 2019).…”

Section: Regression Of N Vs Suitability Classmentioning

confidence: 99%

The limiting factors of land suitability for sandalwood (Santalum album) in Sumba Island, Indonesia

Kurniawan¹,

Pamungkas²

2020

Biodiversitas

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Abstract. Kurniawan H, Pamungkas D. 2020. The limiting factors of land suitability for sandalwood (Santalum album) in Sumba Island, Indonesia. Biodiversitas 21: 3364-3372. The land suitability assessment for sandalwood is very important for the successful cultivation and development of sandalwood (Santalum album Linn.) in Sumba Island, East Nusa Tenggara Province, Indonesia. The map of land suitability classification for sandalwood is currently available. The land suitability assessment is determined based on designated indicators and predictors. It is important to identify the most influential measures in a particular area to determine the suitable treatment to be applied to the sandalwood plant, as well as to recognize the land suitability evaluation swiftly and efficiently. This study was aimed to determine the variables of indicators or verifiers that have the strongest relationship with the land suitability class for sandalwood. Regression method was used to develop the relationship model and to determine the level of the relationship through the coefficient of determination. The result shows that P2O5 content was the most influential factor to determine the land suitability class for sandalwood in Sumba Island.

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Current Progress in Nitrogen Fixing Plants and Microbiome Research

Cited by 215 publications

References 155 publications

Differences in the Endophytic Microbiome of Olive Cultivars Infected by Xylella fastidiosa across Seasons

Differences in the Endophytic Microbiome of Olive Cultivars Infected by Xylella fastidiosa across Seasons

Expression of N‐cycling genes of root microbiomes provides insights for sustaining oilseed crop production

The limiting factors of land suitability for sandalwood (Santalum album) in Sumba Island, Indonesia

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