Root Exudates Alters Nutrient Transport in Soil

Paporisch, Amit; Bavli, Harel; Strickman, Rachel; Neumann, Rebecca B.; Schwartz, Nimrod

doi:10.1029/2021wr029976

Cited by 8 publications

(10 citation statements)

References 58 publications

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“…Therefore, mucilage, both from chia seeds (Salvia hispanica L.) and from ax seeds (Linum usitatissimum), were used in this study as plant model mucilage. Both chia and ax seed mucilage are commonly used to resemble root mucilage in arti cial root-soil systems (Hayat et al, 2021;Naveed et al, 2017Naveed et al, , 2019Oleghe et al, 2017;Paporisch et al, 2021) The chemical composition of chia seed mucilage is similar to maize (Zea mays L.) root mucilage. They both are composed of xylose, glucose and uronic acids, with around 25% of uronic acids (Carminati & Vetterlein, 2013;Lin et al, 1994).…”

Section: Extraction Of Mucilage From Chia Seedsmentioning

confidence: 99%

Rhizosheath formation in soil depends on mucilage concentration and water content

Rahim

Jahromi²,

Amelung³

et al. 2023

Preprint

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Aims: Root exudates contain polymers that form crosslinks and can create a jelly-like substance named mucilage, which adheres to soil and thus promotes the formation of rhizosheath, i.e., of soil that remains attached to roots after gentle shaking. We hypothesized that rhizosheath formation shows an optimum at intermediate mucilage concentration and water content, but that its formation is limited at both high mucilage concentration and dryness as well as at low mucilage concentration and wetness. As parameters are difficult to control in real root-soil systems, we used an artificial root-soil-system where soil moisture and mucilage concentrations could be varied independently from one another in their effect on rhizosheath formation. Methods: Flax cords were disposed in sandy loam soil and in quartz sand, and in later study they were also amended to different moisture contents with five different concentrations of mucilage (from 0 to 0.2g dry mucilage g-1 water), isolated from chia and flaxseed mucilage after swelling of the respective seeds in distilled water for 15 min. Results: We found that in dry soil, rhizosheath formation peaked at intermediate mucilage concentration. This behavior was supported by our conceptual model of mucilage spreading and rhizosheath formation, which relies on a radial diffusion equation and assumes that at low mucilage concentration in the added water, molecule numbers are insufficient to support polymer-like networks that stick soil particles together. In a very concentrated gel, in turn, mucilage is too sticky to diffuse far into soil. Increasing soil moisture promotes rhizosheath formation both in low and high mucilage concentration range, though only to intermediate volumetric water contents of 0.15cm cm–3. Conclusions: We conclude that both water and mucilage concentration are important drivers in rhizosheath formation, but effects are not additive but can combine to an optimum range, with maximum rhizosheath here formed at 0.12 g mucilage g-1 rhizosphere water.

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Section: Extraction Of Mucilage From Chia Seedsmentioning

confidence: 99%

Rhizosheath formation in soil depends on mucilage concentration and water content

Rahim

Jahromi²,

Amelung³

et al. 2023

Preprint

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“…Não obstante de toda importância atribuída ao solo rizosférico, que apresenta diversos íons em sua solução, e do fato de as raízes alterarem dinamicamente as propriedades hidráulicas do solo rizosférico, é pouco estudado o transporte de nutrientes neste solo (Benard et al, 2019;Nietfeld et al, 2017;Paporisch et al, 2021;Zarebanadkouki et al, 2019). Aparentemente, a literatura permanece ainda ausente de estudos do deslocamento miscível em agregados de solo oriundos da rizosfera.…”

Section: Movimento De Solutos Na Rizosferaunclassified

“…Ao que tudo indica, apenas dois estudos anteriores abordaram o DM na rizosfera (Paporisch et al, 2021;Zarebanadkouki et al, 2019). Todavia, Zarebanadkouki et al (2019) utilizaram mucilagem extraída da semente de chia (Salvia hispanica), um análogo da mucilagem da raiz amplamente utilizado (ex.…”

Section: Movimento De Solutos Na Rizosferaunclassified

“…Entretanto, nas BTC do K + , observou-se avanço mais lento (em maior Vp) e pico (maior C/C0) também em maior Vp para o SRZ (Figura 40b). Em solos misturados com exsudados, foi observado um avanço inicial da BTC mais rápido (em menor Vp) e a chegada ao pico de concentração de soluto após maiores Vp em relação a solos sem adição de exsudados (Paporisch et al, 2021). Todavia, o aumento da sorção está relacionado com o atraso da chegada do íon no efluente (Sposito, 1984).…”

Section: Deslocamento Miscível (Dm)unclassified

“…Todavia, o solo da rizosfera, pela sua natureza dinâmica, apresenta alterações estruturais pelo rearranjo de suas partículas modificando seus agregados e até mesmo a estrutura deles, para a captação e dinâmica da água e dos solutos nela dissolvidos, as trocas gasosas e o conteúdo de água na rizosfera (Batista et al, 2020;Bengough, 2012;Carminati et al, 2010;Grassmann et al, 2020;Jon R. Helliwell et al, 2019;Kroener et al, 2018;Paporisch et al, 2021;Zarebanadkouki et al, 2019).…”

Section: Introductionunclassified

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Movimento de água e solutos na rizosfera

Batista¹

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Movimento de água e solutos na rizosfera / Aline Martineli Batista. -versão revisada de acordo com a Resolução CoPGr 6018 de 2011. --Piracicaba, 2022. p.Tese (Doutorado) --USP / Escola Superior de Agricultura "Luiz de Queiroz".1. Deslocamento miscível 2. Curva breakthrough 3. Estabilidade de agregados 4. Atividade microbiológica I. Título Dedico este trabalho aos grandes professores e pesquisadores pelos quais eu tive a honra de ser orientada ao longo da minha jornada acadêmica:

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Purification effects show seed and root mucilage's ability to respond to changing rhizosphere conditions

2023

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Mucilage, a polysaccharide‐containing hydrogel, is hypothesized to play a key role in the rhizosphere as a self‐organized system because it may vary its supramolecular structure with changes in the surrounding solution. However, there is currently limited research on how these changes are reflected in the physical properties of real mucilage. This study examines the role of solutes in maize root, wheat root, chia seed, and flax seed mucilage in relation to their physical properties. Two purification methods, dialysis and ethanol precipitation, were applied to determine the purification yield, cation content, pH, electrical conductivity, surface tension, viscosity, transverse 1H relaxation time, and contact angle after drying of mucilage before and after purification. The two seed mucilage types contain more polar polymers that are connected to larger assemblies via multivalent cation crosslinks, resulting in a denser network. This is reflected in higher viscosity and water retention ability compared to root mucilage. Seed mucilage also contains fewer surfactants, making them better wettable after drying compared to the two root mucilage types. The root mucilage types, on the other hand, contain smaller polymers or polymer assemblies and become less wettable after drying. However, wettability not only depends on the amount of surfactants but also on their mobility, as well as the strength and mesh size of the network structure. The changes in physical properties and cation composition observed after ethanol precipitation and dialysis suggest that the polymer network of seed mucilage is more stable and specialized in protecting the seeds from unfavorable environmental conditions. In contrast, root mucilage is characterized by fewer cationic interactions and its network relies more on hydrophobic interactions. This allows root mucilage to be more flexible in responding to changing environmental conditions, facilitating nutrient and water exchange between root surfaces and the rhizosphere soil.

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Root Exudates Alters Nutrient Transport in Soil

Cited by 8 publications

References 58 publications

Rhizosheath formation in soil depends on mucilage concentration and water content

Rhizosheath formation in soil depends on mucilage concentration and water content

Movimento de água e solutos na rizosfera

Purification effects show seed and root mucilage's ability to respond to changing rhizosphere conditions

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