Root cortical aerenchyma inhibits radial nutrient transport in maize (Zea mays)

Bo Hu, Amelia Henry, Kathleen M. Brown, Jonathan P. Lynch

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Background and AimsFormation of root cortical aerenchyma (RCA) can be induced by nutrient deficiency. In species adapted to aerobic soil conditions, this response is adaptive by reducing root maintenance requirements, thereby permitting greater soil exploration. One trade-off of RCA formation may be reduced radial transport of nutrients due to reduction in living cortical tissue. To test this hypothesis, radial nutrient transport in intact roots of maize (Zea mays) was investigated in two radiolabelling experiments employing genotypes with contrasting RCA.MethodsIn the first experiment, time-course dynamics of phosphate loading into the xylem were measured from excised nodal roots that varied in RCA formation. In the second experiment, uptake of phosphate, calcium and sulphate was measured in seminal roots of intact young plants in which variation in RCA was induced by treatments altering ethylene action or genetic differences.Key ResultsIn each of three paired genotype comparisons, the rate of phosphate exudation of high-RCA genotypes was significantly less than that of low-RCA genotypes. In the second experiment, radial nutrient transport of phosphate and calcium was negatively correlated with the extent of RCA for some genotypes.ConclusionsThe results support the hypothesis that RCA can reduce radial transport of some nutrients in some genotypes, which could be an important trade-off of this trait.

Original languageEnglish (US)
Pages (from-to)181-189
Number of pages9
JournalAnnals of botany
Volume113
Issue number1
DOIs
StatePublished - Jan 1 2014

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nutrient transport
Zea mays
corn
genotype
phosphates
aerenchyma
radiolabeling
calcium phosphates
exudation
nutrient deficiencies
xylem
ethylene
soil quality
sulfates

All Science Journal Classification (ASJC) codes

  • Plant Science

Cite this

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title = "Root cortical aerenchyma inhibits radial nutrient transport in maize (Zea mays)",
abstract = "Background and AimsFormation of root cortical aerenchyma (RCA) can be induced by nutrient deficiency. In species adapted to aerobic soil conditions, this response is adaptive by reducing root maintenance requirements, thereby permitting greater soil exploration. One trade-off of RCA formation may be reduced radial transport of nutrients due to reduction in living cortical tissue. To test this hypothesis, radial nutrient transport in intact roots of maize (Zea mays) was investigated in two radiolabelling experiments employing genotypes with contrasting RCA.MethodsIn the first experiment, time-course dynamics of phosphate loading into the xylem were measured from excised nodal roots that varied in RCA formation. In the second experiment, uptake of phosphate, calcium and sulphate was measured in seminal roots of intact young plants in which variation in RCA was induced by treatments altering ethylene action or genetic differences.Key ResultsIn each of three paired genotype comparisons, the rate of phosphate exudation of high-RCA genotypes was significantly less than that of low-RCA genotypes. In the second experiment, radial nutrient transport of phosphate and calcium was negatively correlated with the extent of RCA for some genotypes.ConclusionsThe results support the hypothesis that RCA can reduce radial transport of some nutrients in some genotypes, which could be an important trade-off of this trait.",
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Root cortical aerenchyma inhibits radial nutrient transport in maize (Zea mays). / Hu, Bo; Henry, Amelia; Brown, Kathleen M.; Lynch, Jonathan P.

In: Annals of botany, Vol. 113, No. 1, 01.01.2014, p. 181-189.

Research output: Contribution to journalArticle

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