Rhizosphere hydrophobicity limits root water uptake after drying and subsequent rewetting

Zarebanadkouki, Mohsen; Ahmed, Mutez Ali; Hedwig, Clemens; Benard, Pascal; Kostka, Stanley J.; Kastner, Anders; Carminati, Andrea

doi:10.1007/s11104-018-3677-7

Cited by 20 publications

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“…After rewetting, RWU usually took several days to reach the maximum value. Similar results were also obtained by previous researchers (Carminati et al., ; Zarebanadkouki et al., ; Zarebanadkouki, Ahmed, & Carminati, ). They found that the rhizosphere was wetter than the soil during drying, but stayed temporarily dry after rewetting.…”

Section: Discussionsupporting

confidence: 92%

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Modelling root water uptake under deficit irrigation and rewetting in Northwest China

et al. 2020

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The spatial and temporal distribution of root water uptake (RWU) under deficit irrigation are critical factors for crop growth. The SWAP (soil–water–atmosphere–plant) model was applied to analyze the pattern of RWU for winter wheat (Triticum aestivum L.) under three irrigation levels: no water deficit (100% evapotranspiration [ET]), moderate water deficit (80% ET) and severe water deficit (60% ET). The 2–yr experiments indicated that SWAP was highly accurate (mean relative error [MRE] <21.7%, root mean square error [RMSE] <0.07 cm3 cm−3) in simulating the soil water content (SWC). Root water uptake was significantly (P < 0.01) different in the 0‐ to 60‐cm soil layer. The 0‐ to 60‐cm soil layer was the main source of RWU, and the average value accounted for 89.4% of the total root zone. Water stress had the greatest adverse effect on heading to grain filling, reducing RWU by 0.0026 cm3 cm−3 d−1. The critical SWC was 67.9% of the field capacity, when the RWU dropped to 95% of the control treatment. After rewetting, compensation and hysteresis effects on RWU were observed. The ranking of RWU recovery ability after rewetting was: emergence to jointing > jointing to heading > grain filling to maturity > heading to grain filling. Recovery time of RWU was 2 to 11 d and gradually increased with growth stage. The simplified RWU model established using path analysis and regression performed well (R2 = 0.836; P < 0.01) for RWU. This provided a more convenient way to accurately estimate RWU with fewer variables.

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Section: Discussionsupporting

confidence: 92%

“…Hydrophobicity temporarily limited the water throughout the rhizosphere interface (Zarebanadkouki et al., ). However, this was not always negative because it prevented severe root dehydration and kept root vitality during drought (Zarebanadkouki et al., ).…”

Section: Discussionmentioning

confidence: 99%

Modelling root water uptake under deficit irrigation and rewetting in Northwest China

et al. 2020

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“…A possible explanation for differences in water uptake despite similar distributions in rooting depth is differences in soil hydraulic properties due to root exudation. One effect of microbial stimulation by root exudates is to greatly reduce water uptake by roots and water flow in soil (Choudhury et al 2018 ; Zarebanadkouki et al 2018 ). Kroener et al ( 2016 ) have shown that the hydraulic properties of the rhizosphere can greatly affect water uptake by roots and the reduced conductivity of the rhizosphere soil to water can reduce the effects of drought stress.…”

Section: Introductionmentioning

confidence: 99%

A comparison between water uptake and root length density in winter wheat: effects of root density and rhizosphere properties

et al. 2020

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Background and aims We aim to quantify the variation in root distribution in a set of 35 experimental wheat lines. We also compared the effect of variation in hydraulic properties of the rhizosphere on water uptake by roots. Methods We measured the root length density and soil drying in 35 wheat lines in a field experiment. A 3D numerical model was used to predict soil drying profiles with the different root length distributions and compared with measured soil drying. The model was used to test different scenarios of the hydraulic properties of the rhizosphere. Results We showed that wheat lines with no detectable differences in root length density can induce soil drying profiles with statistically significant differences. Our data confirmed that a root length density of at least 1 cm/cm 3 is needed to drain all the available water in soil. In surface layers where the root length density was far greater than 1 cm/ cm 3 water uptake was independent of rooting density due to competition for water. However, in deeper layers where root length density was less than 1 cm/cm 3 , water uptake by roots was proportional to root density. Conclusion In a set of wheat lines with no detectable differences in the root length density we found significant differences in water uptake. This may be because small differences in root density at depth can result in larger differences in water uptake or that the hydraulic properties of the rhizosphere can greatly affect water uptake.

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“…1d). Zarebanadkouki et al (2018) proved that rhizosphere water repellency limits the recovery of K i after rewetting. It follows that K i is not simply a function of the contact area between root and soil, but it depends on the specific hydraulic properties of the volume of soil surrounding the roots, the rhizosphere.…”

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“…(d) Neutron radiography of lupin roots in a sandy soil showing that the rhizosphere remained temporarily dry (due to its water repellency) after irrigation. The gray values are proportional to volumetric water contents (wet is dark) (modified from Zarebanadkouki et al, 2018).…”

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Stomatal closure prevents the drop in soil water potential around roots

et al. 2020

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Rhizosphere hydrophobicity limits root water uptake after drying and subsequent rewetting

Cited by 20 publications

References 32 publications

Modelling root water uptake under deficit irrigation and rewetting in Northwest China

Modelling root water uptake under deficit irrigation and rewetting in Northwest China

A comparison between water uptake and root length density in winter wheat: effects of root density and rhizosphere properties

Stomatal closure prevents the drop in soil water potential around roots

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