Lack of evidence for programmed root senescence in common bean (Phaseolus vulgaris) grown at different levels of phosphorus supply

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Abstract

The influence of phosphorus (P) availability on root lifespan in common bean (Phaseolus vulgaris cv. Carioca) is reported here, as well as patterns of root survivorship in relation to vegetative and reproductive development. Plants were grown in a glasshouse in a sand-culture system with varying P availability, and in a high-P field soil with greater biotic activity. Root dynamics were assessed using a minirhizotron system. Phosphorus limitation, which reduced plant growth by 90%, did not diminish root survivorship. At nonlimiting and limiting R root survivorship was not synchronized closely with shoot development and senescence; a substantial portion of the roots were present and seemingly alive even beyond reproductive maturity. In field-grown beans and in beans under severe P limitation in sand culture, survivorship fell approx. 50%, but only after pod fill was nearly complete. Common bean does not exhibit programmed root senescence during and immediately following pod fill. Roots died after the shoot had undergone other senescence processes, such as leaf drop and pod dry-down. Under field conditions, soil organisms are likely to modulate the effects of phosphorus deficiency and pod fill on root death.

Original languageEnglish (US)
Pages (from-to)63-71
Number of pages9
JournalNew Phytologist
Volume153
Issue number1
DOIs
StatePublished - Jan 23 2002

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Phaseolus
Phosphorus
Phaseolus vulgaris
beans
phosphorus
Sand
Soil
Availability
Soils
pods
survival rate
Growth
sand
shoots
sexual maturity
plant growth
death
greenhouses

All Science Journal Classification (ASJC) codes

  • Plant Science
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

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title = "Lack of evidence for programmed root senescence in common bean (Phaseolus vulgaris) grown at different levels of phosphorus supply",
abstract = "The influence of phosphorus (P) availability on root lifespan in common bean (Phaseolus vulgaris cv. Carioca) is reported here, as well as patterns of root survivorship in relation to vegetative and reproductive development. Plants were grown in a glasshouse in a sand-culture system with varying P availability, and in a high-P field soil with greater biotic activity. Root dynamics were assessed using a minirhizotron system. Phosphorus limitation, which reduced plant growth by 90{\%}, did not diminish root survivorship. At nonlimiting and limiting R root survivorship was not synchronized closely with shoot development and senescence; a substantial portion of the roots were present and seemingly alive even beyond reproductive maturity. In field-grown beans and in beans under severe P limitation in sand culture, survivorship fell approx. 50{\%}, but only after pod fill was nearly complete. Common bean does not exhibit programmed root senescence during and immediately following pod fill. Roots died after the shoot had undergone other senescence processes, such as leaf drop and pod dry-down. Under field conditions, soil organisms are likely to modulate the effects of phosphorus deficiency and pod fill on root death.",
author = "Fisher, {Maria C T} and David Eissenstat and Lynch, {Jonathan Paul}",
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AU - Fisher, Maria C T

AU - Eissenstat, David

AU - Lynch, Jonathan Paul

PY - 2002/1/23

Y1 - 2002/1/23

N2 - The influence of phosphorus (P) availability on root lifespan in common bean (Phaseolus vulgaris cv. Carioca) is reported here, as well as patterns of root survivorship in relation to vegetative and reproductive development. Plants were grown in a glasshouse in a sand-culture system with varying P availability, and in a high-P field soil with greater biotic activity. Root dynamics were assessed using a minirhizotron system. Phosphorus limitation, which reduced plant growth by 90%, did not diminish root survivorship. At nonlimiting and limiting R root survivorship was not synchronized closely with shoot development and senescence; a substantial portion of the roots were present and seemingly alive even beyond reproductive maturity. In field-grown beans and in beans under severe P limitation in sand culture, survivorship fell approx. 50%, but only after pod fill was nearly complete. Common bean does not exhibit programmed root senescence during and immediately following pod fill. Roots died after the shoot had undergone other senescence processes, such as leaf drop and pod dry-down. Under field conditions, soil organisms are likely to modulate the effects of phosphorus deficiency and pod fill on root death.

AB - The influence of phosphorus (P) availability on root lifespan in common bean (Phaseolus vulgaris cv. Carioca) is reported here, as well as patterns of root survivorship in relation to vegetative and reproductive development. Plants were grown in a glasshouse in a sand-culture system with varying P availability, and in a high-P field soil with greater biotic activity. Root dynamics were assessed using a minirhizotron system. Phosphorus limitation, which reduced plant growth by 90%, did not diminish root survivorship. At nonlimiting and limiting R root survivorship was not synchronized closely with shoot development and senescence; a substantial portion of the roots were present and seemingly alive even beyond reproductive maturity. In field-grown beans and in beans under severe P limitation in sand culture, survivorship fell approx. 50%, but only after pod fill was nearly complete. Common bean does not exhibit programmed root senescence during and immediately following pod fill. Roots died after the shoot had undergone other senescence processes, such as leaf drop and pod dry-down. Under field conditions, soil organisms are likely to modulate the effects of phosphorus deficiency and pod fill on root death.

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U2 - 10.1046/j.0028-646X.2001.00285.x

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