Rhizosheath: Distinct features and environmental functions

Mo, Xiaohan; Wang, Mengke; Zeng, Hui; Wang, Junjian

doi:10.1016/j.geoderma.2023.116500

Cited by 12 publications

(6 citation statements)

References 96 publications

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“…Planting of wheat crops that can establish on little or no follow-up rain will minimise the risk of crop failure and contribute to improved weed control and nutrient use. Although grain yield data were not collected, the results support long-standing suggestions that rhizosheath formation may aid plant survival in conditions of declining water availability (Hartnett et al 2013;Lynch et al 2014;Rellán-Álvarez et al 2016;Brown et al 2017;Basirat et al 2019;Ndour et al 2020;Aslam et al 2022;Cheraghi et al 2023;Mo et al 2023). Improving crop establishment under harsh conditions will translate to higher density of plants that survive and are able to produce grains.…”

Section: Discussionmentioning

confidence: 53%

“…; Liu et al 2019a), maize (Zea mays L.; Watt et al 1994;Adu et al 2017), and rice (Oryza sativa L.; Zhang et al 2020). Multiple research reviews have highlighted the distinct properties of rhizosheaths compared with bulk soil, such as 66% higher water content, 34% higher soil organic carbon, 56% higher water-extractable organic carbon and 71% higher microbial biomass, and their probable role in water and nutrient uptake (Lynch et al 2014;Brown et al 2017;Basirat et al 2019;Ndour et al 2020;Aslam et al 2022;Cheraghi et al 2023;Mo et al 2023).…”

Section: Introductionmentioning

confidence: 99%

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Ability of wheat genotypes to form large rhizosheaths may enhance survival of false-break events in rainfed production

Emebiri,

Rohan,

Hildebrand

et al. 2024

Crop & Pasture Science

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Context Crop production is one of the agricultural sectors most vulnerable to climate change. In order to minimise risks, innovative technologies and management strategies are continually being developed. Early sowing is a strategy used in wheat production; however, with irregular rainfall patterns, false breaks can occur. Aims We sought to determine the optimal volume of autumn-break rainfall for the start of season, and whether formation of a larger rhizosheath (i.e. the thick layer of soil adhering to roots) can buffer wheat seedlings from false-break conditions, thereby keeping plants alive until the next rainfall. Methods In glasshouse experiments, six varieties of common wheat (Triticum aestivum L.), two with contrasting rhizosheath-forming ability and the other four untested, were grown on two soil types (Kandosol and Vertosol) under simulated autumn-break rainfall and false-break durations. Rhizosheath size and plant establishment traits were measured. Key results The ability to form large rhizosheaths explained ~80% of the variability in crop establishment under various scenarios of false-break conditions. Comparative growth performance of the cultivars forming the largest (cv. Flanker) and smallest (cv. Westonia) rhizosheaths showed that they were largely similar for the first 28 days of drought but differed significantly thereafter. Flanker was progressively better able to establish as false-break duration increased and showed significantly greater tiller and leaf production than Westonia. Conclusions We demonstrate that genotype selection for formation of large rhizosheaths can help to reduce plant seedling death under false-break conditions. Implications Although the amount of starting rainfall is critical, cultivars differ significantly with regard to how far they can develop without follow-up rain. Future research is suggested for a field-scale study of the potential for selection for larger rhizosheaths to improve wheat crop establishment under harsh conditions.

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Section: Discussionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Ability of wheat genotypes to form large rhizosheaths may enhance survival of false-break events in rainfed production

Emebiri,

Rohan,

Hildebrand

et al. 2024

Crop & Pasture Science

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“…Surface soil samples (0-20 cm) were collected from each plot using a five-point sampling method both before sowing and at the time of wheat maturity. At wheat maturity, we collected soil samples from the vicinity of wheat roots via the root-shaking method [28,29]. The collected soil samples were placed in plastic sample trays to remove stones, plant debris, and other impurities mixed in the soil.…”

Section: Sample Collection and Preparationmentioning

confidence: 99%

Low-Cadmium Wheat Cultivars Limit the Enrichment, Transport and Accumulation of Cadmium

Bai,

Ding,

et al. 2024

Agronomy

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Low-cadmium (Cd) accumulating wheat cultivars (LAWC-Cds) can effectively reduce the total Cd content in wheat grains (Grain-Cd). Thirteen LAWC-Cds were planted in three fields to study the enrichment, transport, and accumulation patterns of Cd in LAWC-Cds. Compared with the soil properties before planting, the soil pH and the total Cd content in the soil decreased, while the Cd content in the diethylenetriaminepentaacetic acid extract, soil conductivity, and soil organic matter increased at wheat maturity. The Cd enrichment capacity of the different organs of wheat decreased in the following order: root > leaf > rachis > stem > glume > grain. The dynamics of Cd accumulation in roots affected Grain-Cd, and these factors were negatively correlated. The Cd content and Cd accumulation in all organs of LAWC-Cds showed strong negative correlations with the lengths of the first and second internodes and highly significant positive correlations with both grains per spike and awn length. Structural equation modeling showed that the Cd content of wheat organs had the most direct effect (0.639) in determining Grain-Cd, and soil properties had the largest effect (0.744) in influencing Grain-Cd. This study is important for screening wheat cultivars with stable low Cd-accumulation characteristics.

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“…and eudicotyledons (Fabales, Caryophyllales, Brassicales, Solanales, etc.) [22,29,35,[45][46][47][48]. In view of its beneficial functions on abiotic-stressed plants, rhizosheath have also been investigated in crop species grown in various severe conditions (e.g., drought, low nutrients or acid soil conditions).…”

Section: Rhizosheathmentioning

confidence: 99%

“…In a recent, accurate study, Mo et al [48] compared several physical, chemical and microbial features of rhizosheath soils from bulk, loose rhizosphere and outer rhizosphere soils, collecting and statistically elaborating upon data from numerous works in the literature. Significant differences were noted between the typologies of the considered soils: in particular, rhizosheath soils presented higher values of gravimetric water content (+66%); porosity (+11%); organic carbon and total nitrogen content (+34 and +78%, respectively); water-extractable organic carbon and total nitrogen content (+56 and +40%, respectively); available nitrogen, phosphorus and potassium content (+30, 12 and 27%, respectively); microbial biomass carbon and nitrogen content (+71 and +38%, respectively); respiration rate (+67%); and higher polyphenol oxidase and peroxidase activity (+20 and +26%).…”

Section: Benefits and Ecological Functions Of Rhizosheathsmentioning

confidence: 99%

Rhizosheath: Roles, Formation Processes and Investigation Methods

Addesso,

Sofo,

Amato

2023

Soil Systems

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Climate change negatively affects crop productivity, threatening the survival of entire populations from many vulnerable hotspot regions of the world with the risk of exacerbating hunger, malnutrition and international inequality. Selecting plant species manifesting abiotic stress-tolerant adaptive traits represents a challenge towards ensuring that crops are more resistant and resilient to environmental perturbations. The rhizosheath, defined as the complex of root hair, exudates and soil that strongly adheres to plant roots, is a promising root adaptive trait in facing conditions of water and nutrient deficits, as well as acidic soil. Several beneficial ecological functions are attributed to the rhizosheath, such as enhancing water and nutrient uptake; protecting from dehydration, heat and acid stresses; and stimulating microbial activities. It has been described in several Angiosperm species, including crops grown in severe habitats. The aim of this review was to collect the relevant literature produced to date regarding rhizosheaths, focusing on (i) the various processes involved in its formation, including both physicochemical and biological ones; (ii) the evolutionary and ecological role of rhizosheaths; and (iii) the most frequently used methodologies for its investigation and characterization. The present work provides a comprehensive overview of this revolutionary root’s great agronomic importance in order to address future research aiming to fill the existing knowledge gaps and define a common and shared methodology.

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Rhizosheath: Distinct features and environmental functions

Cited by 12 publications

References 96 publications

Ability of wheat genotypes to form large rhizosheaths may enhance survival of false-break events in rainfed production

Ability of wheat genotypes to form large rhizosheaths may enhance survival of false-break events in rainfed production

Low-Cadmium Wheat Cultivars Limit the Enrichment, Transport and Accumulation of Cadmium

Rhizosheath: Roles, Formation Processes and Investigation Methods

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