Root Exudate — Biology

Gupta, Ritu; Mukerji, K. G.

doi:10.1007/978-94-017-3209-3_6

Cited by 18 publications

(8 citation statements)

References 78 publications

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“…It has been well documented root exudates are the most significant determinants of composition and activity of sediment microbial communities (Clairmont et al, 2019; Yang et al, 2013). The effect of root exudates depends on the distance that they can diffuse away from the rhizoplane (Gupta & Mukerj, 2002). Carbon sources, that is, sugars, polymers, and amino acids, which are typically plentifully present in the root exudates, provided the best growth substrates for root‐associated bacterial communities.…”

Section: Discussionmentioning

confidence: 99%

“…Grain size plays an important role in sediment biogeochemistry because unlike coarse sediments, fine sediments accumulate more organic matter in seagrass beds (Dahl et al, 2016; Serrano et al, 2016). The “rhizosphere effect” depends on the distance that root exudates can diffuse away from plant root (Gupta & Mukerj, 2002). Previous studies indicated that sediments with smaller grain size had a lower diffusion capacity of solutes (Hou et al, 2017; Papageorgiou et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

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Gradient of microbial communities around seagrass roots was mediated by sediment grain size

et al. 2022

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Although research on plant rhizosphere is extensive, studies focusing on rhizoplane, rhizosphere, and outer rhizosphere of seagrass remain rare. Here, we present a detailed characterization across root-associated microbiomes of the seagrass Enhalus acoroides at two locations (Xincun Bay and Li'an Harbor in Hainan, South China) with different sediment properties. The metabolic activity and composition of microbial communities within the rhizoplane (R), rhizosphere (SR), and outer rhizosphere (OR) compartments were compared using the Biolog-Eco method and high-throughput sequencing, respectively. These results showed R sediment had the highest metabolic ability in utilizing carbon substrates, followed by SR and OR in both locations, which indicated higher or more diverse carbon resources in sediment in proximity to the roots.With respect to bacterial diversity, our study showed that the OR region supported the highest biodiversity (α indices), followed by SR and R communities, which revealed the strongest selective effect of rhizoplane niche. With respect to community composition, three root-associated communities at Xincun Bay were characterized by a decreasing trend in relative abundance of Sulfurovum and Sulfurimonas (sulfide oxidizers belonging to Episilonproteobacteria) from R to OR, which revealed their better adaption to lower oxygen concentrations and lower available carbon conditions. Vibrio and Photobacterium assigned to Gammaproteobacteria were highly enriched in rhizoplane compared with SR and OR at Li'an Harbor, which may play an important role in nutrient cycling around the seagrass roots. On the other hand, the gradient of bacterial community structure and metabolic capability created by seagrass roots was more obvious at Li'an Harbor than that at Xincun Bay, which may be related to sediment grain size.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Gradient of microbial communities around seagrass roots was mediated by sediment grain size

et al. 2022

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“…The use of sterile sugarcane juice as an additive in the culture medium has been shown to improve the growth of bacterial groups adapted to the sugars, amino acids, vitamins, organic acids, and other small molecules (Gupta and Mukerji, 2002 ; Uren, 2007 ; Kim and Day, 2011 ). Some bacterial groups such as Pseudomonas, Flavobacterium, Agrobacterium , and Enterobacter , for instance, have been shown to respond to rhizosphere exudates (Curl and Truelove, 1986 ; Taghavi et al, 2015 ) that directly affect bacterial growth (Grayston et al, 1998 ; Hadacek and Kraus, 2002 ; Singh and Mukerji, 2006 ).…”

Section: Discussionmentioning

confidence: 99%

A Community-Based Culture Collection for Targeting Novel Plant Growth-Promoting Bacteria from the Sugarcane Microbiome

et al. 2018

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The soil-plant ecosystem harbors an immense microbial diversity that challenges investigative approaches to study traits underlying plant-microbe association. Studies solely based on culture-dependent techniques have overlooked most microbial diversity. Here we describe the concomitant use of culture-dependent and -independent techniques to target plant-beneficial microbial groups from the sugarcane microbiome. The community-based culture collection (CBC) approach was used to access microbes from roots and stalks. The CBC recovered 399 unique bacteria representing 15.9% of the rhizosphere core microbiome and 61.6–65.3% of the endophytic core microbiomes of stalks. By cross-referencing the CBC (culture-dependent) with the sugarcane microbiome profile (culture-independent), we designed a synthetic community comprised of naturally occurring highly abundant bacterial groups from roots and stalks, most of which has been poorly explored so far. We then used maize as a model to probe the abundance-based synthetic inoculant. We show that when inoculated in maize plants, members of the synthetic community efficiently colonize plant organs, displace the natural microbiota and dominate at 53.9% of the rhizosphere microbial abundance. As a result, inoculated plants increased biomass by 3.4-fold as compared to uninoculated plants. The results demonstrate that abundance-based synthetic inoculants can be successfully applied to recover beneficial plant microbes from plant microbiota.

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“…Measurement of the number of bacteria and actinomycetes by the classical method, pointed out significant differences between the soil samples analyzed, with the exception of the soil sample b3., which differs through a the large number of actinomycetes There are studies showing that the distribution of microorganisms in the zone of radicular influence is uneven, but also the microbial community is numerically fluctuating, because the compounds released by plant roots diffuses into the ground at different distances from the root surface (Gupta and Mukerji., 2002), but due to the cell death or lysis intervenes (Semenov et al, 1999). Distance to the plant roots and depth of soil sampling are among the factors that influence the number of bacteria and actinomycetes.…”

Section: Resultsmentioning

confidence: 99%

Plants Root Interference Area, A Benefit To The Microbial Community

Borozan¹,

Popescu²,

Boldura³

2017

BUASVMCN-HORT

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Part of byproducts synthesized by plants through photosynthesis reach the ground, where are creating selective microenvironments for micro-flora and associations of plant -microorganisms, being beneficial for plant growth. In this paper, the effect of the root interference area of vines and herbaceous plants and of radicular exudates from vine rhizosphere on microbial community was studied by estimating the present microbial population. Also, by molecular studies, the diversity of microbiological community was assessed.The microbiological study of biological samples was performed by classical and molecular methods. The biological material was represented by microbial communities from rhizosphere and phyllosphere areas of two varieties of vines White Romanian Tămâioasă and Black Romanian Tămâioasă cultivated in a soil that has never been chemically treated. Overall, bacteria had a significant presence in soil samples taken from the interference area of vines and herbaceous plants roots. Actinomycetes quantitatively dominated the root interference area of herbaceous plant with variety White Romanian Tămâioasă. The range of actinomycetes species and leaves microflora was found to be reduced. In this study we have shown that significant growth of microorganisms occurs in the interference area of vine with other herbal plants as a result of the cumulative effect of radicular exudates and that the surrounding microbial community differs among varieties, areas of interference and also is strongly influenced by the levels of tillage and fertilization of soil.

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Root Exudate — Biology

Cited by 18 publications

References 78 publications

Gradient of microbial communities around seagrass roots was mediated by sediment grain size

Gradient of microbial communities around seagrass roots was mediated by sediment grain size

A Community-Based Culture Collection for Targeting Novel Plant Growth-Promoting Bacteria from the Sugarcane Microbiome

Plants Root Interference Area, A Benefit To The Microbial Community

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