A Critical Oxygen Pressure for Root Extension in Rice

Armstrong, W.; Webb, T.

doi:10.1093/jxb/36.10.1573

Cited by 82 publications

(49 citation statements)

References 11 publications

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“…For example Avicennia marina requires 3 nmol O^ g ' dry mass s~' at 20 °C (Curran, Cole & Allaway, 1986) and some Potamogeton species need between 66 and 15-6 nmol Oj g"^ dry mass s^^ (Sand-Jensen, Prahl & Stockholm, 1982). Furthermore, the O^ concentration at which saturation of Oj uptake occurred was low (0-017 nmol O^ g~^ dry mass s ' at 15 °C) in Phragmites, though comparable to other floodtolerant species (Armstrong & Webb, 1985). This low O2 saturation concentration depends on the value for maximum respiratory Or, uptake, the root radius and the porosity of the roots (Glinsky & Stepniewski, 1985).…”

Section: Discussionmentioning

confidence: 99%

Mcchanism of flood tolerance in reed, Phragmites australis (Cav.) Trin. ex Steudel

1990

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SUMMARYImportant factors, such as porosity, respirational O^ consumption, O^ release of the roots and iron oxidation on the root surface, which are involved in the flood tolerance of Phragmites australis were investigated in northern Germany, The porosity of the different organs was determined as 58 % for rhizomes, 42 % for culms and 23-38 % for adventitious roots. Mean respirational O^ consumption of below ground organs was measured at 5, 10, 15 and 20 °C as respectively 0-25, 0-5, 0-8 and 1-75 nmol O.^ g"' dry mass s"'. The saturation concentration was estimated to be less than 0-017 mmol O.^ 1"' up to 15 °C and 0-03 mmol O^ T' at 20 °C, From values of the root O^ gas exchange obtained from entire plants predictions are made concerning the Oj status of the roots under field conditions throughout the year. The O^ release for a reed stand was calculated as 65-129 mg O^ m"" h~' in summer conditions. The oxidation power of the roots was further demonstrated by the development of iron hydroxideplaques on the root surface.

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Section: Discussionmentioning

confidence: 99%

Mcchanism of flood tolerance in reed, Phragmites australis (Cav.) Trin. ex Steudel

1990

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“…Both forms result in larger longitudinal channels in the root cortex. This structure enhances the diffusion of atmospheric or photosynthetic oxygen via, or from, the shoot to the roots so that aerobic respiration and growth can be maintained (Armstrong & Gaynard 1976;Lambers, Steingrover & Smakman 1978;Armstrong 1979;Armstrong & Webb 1985;Drew, Saglio & Pradet 1985).…”

Section: Introductionmentioning

confidence: 99%

Root Morphology and Aerenchyma Formation as Indicators of the Flood-Tolerance of Rumex Species

Laan¹,

Berrevoets²,

Lythe³

et al. 1989

The Journal of Ecology

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195

135

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“…It has been suggested (Armstrong & Webb, 1985;Armstrong & Beckett, 1987;Atwell & Greenway, 1987) that diffusional resistance rather than enzyme kinetics determines the COPR, i.e. the oxygen concentration, below which respiration is concentration-dependent (Berry & Norris, 1949).…”

Section: Introductionmentioning

confidence: 99%

Oxygen uptake by roots of Rumex species at different temperatures: the relative importance of diffusive resistance and enzyme kinetics

Laan

Tosserams

Huys

et al. 1991

Plant Cell & Environment

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Abstract. Oxygen uptake characteristics of the roots of three Rumex species were compared, and related to kinetics of the respiratory system and to root anatomy. The observed differences could not be explained by differences in fundamental characteristics of the oxygen uptake system: with all three species, cytochromemediated respiration contributed 70% and cyanideinsensitive (alternative) respiration 30% of the total respiration rate, and apparent Km values of cytochrome oxidase were lower than those obtained for the alterna tive oxidase in all cases. However, differences in critical oxygen pressure for respiration (COPR) and in apparent Km for oxygen, were strongly correlated with differences in root porosity and root diameter. Km( 0 2) values at high and low temperatures were determined, and from Arrhenius plots of oxygen uptake rates between 11 and 32°C, the role of diffusional impedance could be esti mated. Root respiration of Rumex maritimus and R. crispus, both with high root porosity, but differing in root diameter, had a low Km for oxygen (3-7 mmol m -3).In contrast with this were the responses of R. thyrsiflorus, which has thin roots but low root porosity: a high Km (10-20 mmol m-3) was found at all temperatures. The role of diffusional impedance as a function of temperature in oxygen uptake rate by the three species is discussed and related to the differential resistance of the species towards flooding.

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A Critical Oxygen Pressure for Root Extension in Rice

Cited by 82 publications

References 11 publications

Mcchanism of flood tolerance in reed, Phragmites australis (Cav.) Trin. ex Steudel

Mcchanism of flood tolerance in reed, Phragmites australis (Cav.) Trin. ex Steudel

Root Morphology and Aerenchyma Formation as Indicators of the Flood-Tolerance of Rumex Species

Oxygen uptake by roots of Rumex species at different temperatures: the relative importance of diffusive resistance and enzyme kinetics

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