Modelling facilitation or competition within a root system: importance of the overlap of root depletion and accumulation zones

Parseval, Henri De; Barot, Sébastien; Gignoux, Jacques; Lata, Jean‐Christophe; Raynaud, Xavier

doi:10.1007/s11104-017-3321-y

Cited by 18 publications

(19 citation statements)

References 54 publications

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“…This view was confirmed and expanded later [57], confirming that the advantage of new Chinese wheat cultivars came from the attenuation of inter-plant competition and increased plasticity in root morphology. A seminal root architecture with fewer, longer seminal roots with narrower root angle, would overlap less with neighbors, leading to less competition between individuals [58], and these trends agree with the hypothesis of weakening of "selfish" traits [59].…”

Section: Classification Of Durum Wheat Genotypes According To Root Mosupporting

confidence: 78%

Durum Wheat Seminal Root Traits within Modern and Landrace Germplasm in Algeria

et al. 2020

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Seminal roots are known to play an important role in crop performance, particularly under drought conditions. A set of 37 durum wheat cultivars and local landraces was screened for variation in architecture and size of seminal roots using a laboratory setting, with a filter paper method combined with image processing by SmartRoot software. Significant genetic variability was detected for all root and shoot traits assessed. Four rooting patterns were identified, with landraces showing overall steeper angle and higher root length, in comparison with cultivars, which presented a wider root angle and shorter root length. Some traits revealed trends dependent on the genotypes’ year of release, like increased seminal root angle and reduced root size (length, surface, and volume) over time. We confirm the presence of a remarkable diversity of root traits in durum wheat whose relationship with adult root features and agronomic performance should be explored.

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Section: Classification Of Durum Wheat Genotypes According To Root Mosupporting

confidence: 78%

Durum Wheat Seminal Root Traits within Modern and Landrace Germplasm in Algeria

et al. 2020

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“…In order to focus the investigation here, we have ignored many of the fascinating aspects of belowground plant ecology – interactions with microbial communities (Bever et al 2009), depth distributions (Schenk and Jackson 2002), nutrient hot spots (Hodge 2004; Chen et al 2018), hydraulic lift (Yu and D’Odorico 2015), facilitation among individuals (Tang et al 2018; De Parseval et al 2017), and even size variation (Goldberg et al 2017). But, the simplified framework has allowed us to clearly understand surprising and potentially fundamental feedbacks.…”

Section: Discussionmentioning

confidence: 99%

Plants maximize competition while minimizing competitors belowground: a theoretical analysis of incentives for root competition in space

Farrior

2018

Preprint

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1Recent research shows that shared access to belowground resources drives plants to 2 overproliferate fine roots competitively, limiting community-level aboveground biomass. Models 3 of this phenomenon are commonly based on an assumption that belowground resources and 4 fine roots are thoroughly well mixed. In reality, of course, fine roots are spatially structured by 5 individual. Here we investigate how costs of sending roots through horizontal space influence 6 incentives for fine-root overproliferation. We find that these costs restrain overproliferation to 7 the net benefit of community aboveground biomass. And further, the costs eliminate incentives 8 for individuals to grow fine roots beyond their closest neighbors. Plants that interact with the 9 fewest competitors benefit the most in relative fitness from overproliferation of fine roots. 10 Effectively, individual-based optimization of root allocation in space increases the effects of 11 competition while decreasing the number of individual competitors for each individual.12 Because an individual's optimal competitive network consists of only the closest neighbors, 13 we predict the full effects of competition are achieved just shortly after disturbance, making 14 competition belowground an almost inescapable pressure on plants. Together these results have 15 important implications for predicting plant interaction networks, patterns of carbon allocation, 16 and ecosystem carbon storage.17

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“…On the one hand, root architecture controls the amount of rhizodeposit release by the number of root tips (Nielsen et al, 1994). On the other hand, root branching and root growth rate determine whether rhizodeposit release zones can overlap, thereby creating patches of high rhizodeposit concentration, which may facilitate water and nutrient uptake (De Parseval et al, 2017; Holz et al, 2018b).…”

Section: Introductionmentioning

confidence: 99%

Simulating rhizodeposition patterns around growing and exuding root systems

Landl¹,

Haupenthal²,

Leitner³

et al. 2021

Preprint

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In this study, we developed a novel model approach to compute the spatio-temporal distribution patterns of rhizodeposits around growing root systems in three dimensions. Root systems were generated using the root architecture model CPlantBox. The concentration of rhizodeposits at a given location in the soil domain was computed analytically. To simulate the spread of rhizodeposits in the soil, we considered rhizodeposit release from the roots, rhizodeposit diffusion into the soil, rhizodeposit sorption to soil particles, and rhizodeposit degradation by microorganisms. To demonstrate the capabilities of our new model approach, we performed simulations for the two example rhizodeposits mucilage and citrate and the two example root systems Vicia faba and Zea mays. The rhizodeposition model was parameterized using values from the literature. Our simulations showed that the rhizosphere soil volume with rhizodeposit concentrations above a defined threshold value (i.e., the rhizodeposit hotspot volume), exhibited a maximum at intermediate root growth rates. Root branching allowed the rhizospheres of individual roots to overlap, resulting in a greater volume of rhizodeposit hotspots. This was particularly important in the case of citrate, where overlap of rhizodeposition zones accounted for more than half of the total rhizodeposit hotspot volumes. The rhizodeposit hotspot volume around the tap root system Vicia faba was shown to be much larger than around the fibrous root system Zea mays. Coupling a root architecture model with a rhizodeposition model allowed us to get a better understanding of the influence of root architecture as well as rhizodeposit properties on the evolution of the spatio-temporal distribution patterns of rhizodeposits around growing root systems.

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Modelling facilitation or competition within a root system: importance of the overlap of root depletion and accumulation zones

Cited by 18 publications

References 54 publications

Durum Wheat Seminal Root Traits within Modern and Landrace Germplasm in Algeria

Durum Wheat Seminal Root Traits within Modern and Landrace Germplasm in Algeria

Plants maximize competition while minimizing competitors belowground: a theoretical analysis of incentives for root competition in space

Simulating rhizodeposition patterns around growing and exuding root systems

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