Root adaptation to soil waterlogging

Armstrong, W.; Justin, S. H. F. W.; Beckett, P. M.; Lythe, S.

doi:10.1016/0304-3770(91)90022-w

Cited by 209 publications

(153 citation statements)

References 34 publications

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“…Upon flooding, diffusion of the gaseous hormone ethylene out of the plant will be reduced due to physical entrapment by the surrounding water layer (Armstrong et al, 1991), and together with sustained ethylene production, as indicated by increased expression of the ethylene biosynthesis genes ACS and ACO, this then leads to increased accumulation of ethylene, shown by the about 3-fold stronger ethylene release from the flooded S. dulcamara stem after 24 h of partial submergence ( Fig. 2A).…”

Section: Ethylene As a Conserved Trigger For Adaptive Responses To Flmentioning

confidence: 99%

“…The primary effect of this stressor is a slower gas diffusion (about 10,000-fold less in water than in air; Armstrong et al, 1991), which leads to reduced gas exchange between the plant and its environment, thereby disturbing internal concentrations of oxygen, carbon dioxide, and ethylene (Bailey-Serres and Voesenek, 2008). This results in detrimental effects on cellular metabolic homeostasis, but at the same time these changes in gas concentrations are used as cues to alter gene expression leading to acclimation.…”

mentioning

confidence: 99%

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A Co-Opted Hormonal Cascade Activates Dormant Adventitious Root Primordia upon Flooding in Solanum dulcamara

et al. 2016

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Section: Ethylene As a Conserved Trigger For Adaptive Responses To Flmentioning

confidence: 99%

mentioning

confidence: 99%

A Co-Opted Hormonal Cascade Activates Dormant Adventitious Root Primordia upon Flooding in Solanum dulcamara

et al. 2016

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“…The contrasting responses of CH 4 fluxes to vegetation in different geographical areas highlight complex interactions between the vegetation type, climatic regions and CH 4 emissions. N 2 O emissions are also strongly linked to substrate supply and concentrations of oxygen in the peat matrix, with high oxygen levels reducing emissions (Armstrong et al 1991;De Bont et al 1978;King and Wiebe 1978). These findings suggest that CO 2 , CH 4 , and N 2 O emissions are controlled by competing processes linked to the type and activity of the vegetation.…”

Section: Introductionmentioning

confidence: 98%

Root oxygen loss from Raphia taedigera palms mediates greenhouse gas emissions in lowland neotropical peatlands

et al. 2016

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Aims Little is known about the influence of vegetation on the timing and quantities of greenhouse gas fluxes from lowland Neotropical peatlands to the atmosphere. To address this knowledge gap, we investigated if palm forests moderate greenhouse gas fluxes from tropical peatlands due to radial oxygen loss from roots into the peat matrix. Methods We compared the diurnal pattern of greenhouse gas fluxes from peat monoliths with and without seedlings of Raphia taedigera palm, and monitored the effect of land use change on greenhouse gas fluxes from R. taedigera palm swamps in Bocas del Toro, Panama. Results CH 4 fluxes from peat monoliths with R. taedigera seedlings varied diurnally, with the greatest emissions during daytime. Radial oxygen loss from the roots of R. taedigera seedlings partially supressed CH 4 emissions at midday; this suppression increased as seedlings grew. On a larger scale, removal of R. taedigera palms for agriculture increased CH 4 and N 2 O fluxes, but decreased CO 2 fluxes when compared to nearby intact palm forest. The net impact of forest clearance was a doubling of the radiative forcing. Conclusions R. taedigera palm forest influences the emission of greenhouse gases from lowland tropical peatlands through radial oxygen loss into the rhizosphere.

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“…As discussed above, rates of release differ between different parts of the root system. A large part of the length of primary roots is relatively impermeable to Og (Armstrong et al, 1991). As a first approximation, we assume that only the medium and fine roots release O2 and calculate fiuxes based on the sum of the medium and fine root surface areas.…”

Section: Discussionmentioning

confidence: 99%

Changes in rice root architecture, porosity, and oxygen and proton release under phosphorus deficiency

Kirk

1997

New Phytologist

110

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SUMMARYEarlier work has shown that rice plants growing in reduced soil are able to solubilize P and thereby increase their P uptake by inducing an acidification in the rhizosphere; the acidification is caused by H* produced in Fe*+ oxidation by root-released O^, and by the direct release of H+ from the roots to balance cation-anion intake. Here, we report rates of release of Oj and H+ from P-stressed and P-sufficient rice plants into sand cultures continuously perfused with deoxygenated nutrient solution. The P stress was sufficient to reduce plant dry mass by roughly half, but root dry mass increased roughly twofold and root surface area 2-5-fold. The proportion of fine roots increased from 11 to 21 % of root length under P deficiency; root porosity, averaged over the whole root system, increased from 0-25 to 040. Apparent rates of O^ release were O-8-3-3 /imol per plant d'^, or 22-87 /imol g'> (root dry mass) d-^ Assuming that the bulk of the O^ was released from medium and fine roots, the fiuxes of O^ were 0-02-0-13 nmol dm"^ (root surface) s"^ which is in the range found for soil-grown plants. The release per plant was twofold greater in the low P treatment, although rates of release per unit root mass were slightly lower. The increased release under P deficiency is consistent with the increased length of fine roots and increased porosity. Rates of H+ release were 0-7-1-2 mmol per planr^ d-\ or 1-4-61 mmol g-^ (root dry mass) d"'. The H+ release per unit plant dry mass was 60 % greater in the low P treatment, but the release per unit root mass was 2-5-fold lower. The increased H+ release under P deficiency was associated with increased NH/ intake and decreased NO,-intake, and a tenfold increase in plant NO3-N. This suggests that P deficiency reduced NO,^ assimilation, causing reduced NOg" infiux and/or increased efflux.ere.

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Root adaptation to soil waterlogging

Cited by 209 publications

References 34 publications

A Co-Opted Hormonal Cascade Activates Dormant Adventitious Root Primordia upon Flooding in Solanum dulcamara

A Co-Opted Hormonal Cascade Activates Dormant Adventitious Root Primordia upon Flooding in Solanum dulcamara

Root oxygen loss from Raphia taedigera palms mediates greenhouse gas emissions in lowland neotropical peatlands

Changes in rice root architecture, porosity, and oxygen and proton release under phosphorus deficiency

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