POLYMORPHISM AND PHYSIOLOGY OF ARSENATE TOLERANCE IN HOLCUS-LANATUS L FROM AN UNCONTAMINATED SITE

A A MEHARG, M R MACNAIR

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The polymorphism of arsenate tolerance in a Holcus lanatus L. population from an uncontaminated soil was investigated and a high percentage of tolerant individuals (65%) was found in the population studied. Influx of arsenate was highly correlated to arsenate tolerance within the population, with the most tolerant individuals having the lowest rates of arsenate influx. Isotherms for the high affinity arsenate uptake systems were determined in six tolerant and six non-tolerant genotypes. Tolerant plants had the lowest rates of arsenate influx. This was achieved by adaptation of the V(max) of arsenate influx with the V(max) of the high affinity uptake system saturating at lower substrate concentrations in the tolerant plants. The polymorphism is discussed with relation to adaptation to the extreme environments to which the plants are subjected on mine-spoil soils.

Original languageEnglish
Pages (from-to)219-225
Number of pages7
JournalPlant and Soil
Volume146
Issue number1-2
Publication statusPublished - Oct 1992

Keywords

  • ARSENATE
  • HOLCUS-LANATUS L
  • POLYMORPHISM
  • TOLERANCE
  • UPTAKE MECHANISMS
  • AGROSTIS-CAPILLARIS L
  • COPPER TOLERANCE
  • MIMULUS-GUTTATUS
  • PLANTS
  • SOIL

Cite this

POLYMORPHISM AND PHYSIOLOGY OF ARSENATE TOLERANCE IN HOLCUS-LANATUS L FROM AN UNCONTAMINATED SITE. / MEHARG, A A ; MACNAIR, M R .

In: Plant and Soil, Vol. 146, No. 1-2, 10.1992, p. 219-225.

Research output: Contribution to journalArticle

MEHARG, A A ; MACNAIR, M R . / POLYMORPHISM AND PHYSIOLOGY OF ARSENATE TOLERANCE IN HOLCUS-LANATUS L FROM AN UNCONTAMINATED SITE. In: Plant and Soil. 1992 ; Vol. 146, No. 1-2. pp. 219-225.
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AB - The polymorphism of arsenate tolerance in a Holcus lanatus L. population from an uncontaminated soil was investigated and a high percentage of tolerant individuals (65%) was found in the population studied. Influx of arsenate was highly correlated to arsenate tolerance within the population, with the most tolerant individuals having the lowest rates of arsenate influx. Isotherms for the high affinity arsenate uptake systems were determined in six tolerant and six non-tolerant genotypes. Tolerant plants had the lowest rates of arsenate influx. This was achieved by adaptation of the V(max) of arsenate influx with the V(max) of the high affinity uptake system saturating at lower substrate concentrations in the tolerant plants. The polymorphism is discussed with relation to adaptation to the extreme environments to which the plants are subjected on mine-spoil soils.

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KW - COPPER TOLERANCE

KW - MIMULUS-GUTTATUS

KW - PLANTS

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