Effects of phosphate supply and inoculation with a vesicular‐arbuscular mycorrhizal fungus on the death of the root cortex of wheat, rape and subterranean clover

W. J. MacLeod, A. D. Robson, L. K. Abbott

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17 Citations (Scopus)

Abstract

The effect of phosphorus supply and mycorrhizal infection on the death of the cortex of roots (RCD) was examined in two glasshouse experiments. RCD was observed in both Australian and English cultivars of wheat (Triticum aestivum L.), and in rape (Brassica napus L.), but not in subterranean clover (Trifolium subterraneum L.). It occurred most rapidly in wheat plants moderately deficient in phosphorus (i.e. in plants producing approx. 60% of shoot weight with phosphorus not limiting growth) but was delayed both in plants severely deficient in phosphorus and in plants with adequate and luxury supplies of phosphorus compared to those which were moderately deficient. Although inoculation with a vesicular‐arbuscular mycorrhizal fungus did not markedly affect plant growth, it delayed RCD in phosphorus‐deficient plants and accelerated RCD in phosphorus‐adequate plants. The effects of phosphorus supply and mycorrhizal infection on RCD cannot be readily explained by effects of these treatments on plant growth or phosphorus concentrations within plants. Moreover, it is unlikely that effects of these treatments on RCD are related to effects on the availability of assimilates required to maintain the cortex.

Original languageEnglish
Pages (from-to)349-357
Number of pages9
JournalNew Phytologist
Volume103
Issue number2
DOIs
Publication statusPublished - Jun 1986

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Medicago
Trifolium subterraneum
mycorrhizal fungi
Triticum
cortex
Fungi
Phosphates
Phosphorus
phosphates
death
phosphorus
wheat
plant growth
Growth
Trifolium
Brassica napus
infection
Infection
Triticum aestivum
greenhouses

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title = "Effects of phosphate supply and inoculation with a vesicular‐arbuscular mycorrhizal fungus on the death of the root cortex of wheat, rape and subterranean clover",
abstract = "The effect of phosphorus supply and mycorrhizal infection on the death of the cortex of roots (RCD) was examined in two glasshouse experiments. RCD was observed in both Australian and English cultivars of wheat (Triticum aestivum L.), and in rape (Brassica napus L.), but not in subterranean clover (Trifolium subterraneum L.). It occurred most rapidly in wheat plants moderately deficient in phosphorus (i.e. in plants producing approx. 60{\%} of shoot weight with phosphorus not limiting growth) but was delayed both in plants severely deficient in phosphorus and in plants with adequate and luxury supplies of phosphorus compared to those which were moderately deficient. Although inoculation with a vesicular‐arbuscular mycorrhizal fungus did not markedly affect plant growth, it delayed RCD in phosphorus‐deficient plants and accelerated RCD in phosphorus‐adequate plants. The effects of phosphorus supply and mycorrhizal infection on RCD cannot be readily explained by effects of these treatments on plant growth or phosphorus concentrations within plants. Moreover, it is unlikely that effects of these treatments on RCD are related to effects on the availability of assimilates required to maintain the cortex.",
keywords = "phosphorus, rape, Root cortex death, subterranean clover, wheat",
author = "MacLeod, {W. J.} and Robson, {A. D.} and Abbott, {L. K.}",
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T1 - Effects of phosphate supply and inoculation with a vesicular‐arbuscular mycorrhizal fungus on the death of the root cortex of wheat, rape and subterranean clover

AU - MacLeod, W. J.

AU - Robson, A. D.

AU - Abbott, L. K.

PY - 1986/6

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N2 - The effect of phosphorus supply and mycorrhizal infection on the death of the cortex of roots (RCD) was examined in two glasshouse experiments. RCD was observed in both Australian and English cultivars of wheat (Triticum aestivum L.), and in rape (Brassica napus L.), but not in subterranean clover (Trifolium subterraneum L.). It occurred most rapidly in wheat plants moderately deficient in phosphorus (i.e. in plants producing approx. 60% of shoot weight with phosphorus not limiting growth) but was delayed both in plants severely deficient in phosphorus and in plants with adequate and luxury supplies of phosphorus compared to those which were moderately deficient. Although inoculation with a vesicular‐arbuscular mycorrhizal fungus did not markedly affect plant growth, it delayed RCD in phosphorus‐deficient plants and accelerated RCD in phosphorus‐adequate plants. The effects of phosphorus supply and mycorrhizal infection on RCD cannot be readily explained by effects of these treatments on plant growth or phosphorus concentrations within plants. Moreover, it is unlikely that effects of these treatments on RCD are related to effects on the availability of assimilates required to maintain the cortex.

AB - The effect of phosphorus supply and mycorrhizal infection on the death of the cortex of roots (RCD) was examined in two glasshouse experiments. RCD was observed in both Australian and English cultivars of wheat (Triticum aestivum L.), and in rape (Brassica napus L.), but not in subterranean clover (Trifolium subterraneum L.). It occurred most rapidly in wheat plants moderately deficient in phosphorus (i.e. in plants producing approx. 60% of shoot weight with phosphorus not limiting growth) but was delayed both in plants severely deficient in phosphorus and in plants with adequate and luxury supplies of phosphorus compared to those which were moderately deficient. Although inoculation with a vesicular‐arbuscular mycorrhizal fungus did not markedly affect plant growth, it delayed RCD in phosphorus‐deficient plants and accelerated RCD in phosphorus‐adequate plants. The effects of phosphorus supply and mycorrhizal infection on RCD cannot be readily explained by effects of these treatments on plant growth or phosphorus concentrations within plants. Moreover, it is unlikely that effects of these treatments on RCD are related to effects on the availability of assimilates required to maintain the cortex.

KW - phosphorus

KW - rape

KW - Root cortex death

KW - subterranean clover

KW - wheat

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