Host genotype and the formation and function of VA mycorrhizae

J. H. Graham, David Eissenstat

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

VA mycorrhizae, the most ancient type of mycorrhizal symbiosis, are present in the most phytogenetically advanced groups. Few plants have evolved mechanisms to completely prevent infection by VAM fungi. Yet, plant species that are less dependent on VA mycorrhizae for nutrient acquisition (e.g., grasses) generally have less root colonization in the field than more dependent species (e.g., Citrus). Among closely related Citrus genotypes, there is a greater tendency for less dependent species to limit the rate but not the extent of colonization, even in high-P soils. We hypothesize that colonization represents a significant carbon cost that may be regulated by the host genotype. Carbon expenditure on the fungus at high P may result in mycorrhizal-induced growth depression. The potential value of breeding plants for greater susceptibility to colonization will depend on the cost/benefit of VA mycorrhizae for the specific crop, soil and environmental conditions. Although the genetics and physiology of host control over VAM colonization are barely known, recently discovered mycorrhizal colonization mutants (myc-) of pea offer great promise for the study of host-fungus compatibility.

Original languageEnglish (US)
Pages (from-to)179-185
Number of pages7
JournalPlant and Soil
Volume159
Issue number1
DOIs
StatePublished - Feb 1 1994

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vesicular arbuscular mycorrhizae
mycorrhiza
genotype
colonization
fungi
Citrus
fungus
carbon
breeding value
plant breeding
symbiosis
soil quality
peas
physiology
root colonization
grasses
mutants
environmental factors
nutrients
expenditure

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

Cite this

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abstract = "VA mycorrhizae, the most ancient type of mycorrhizal symbiosis, are present in the most phytogenetically advanced groups. Few plants have evolved mechanisms to completely prevent infection by VAM fungi. Yet, plant species that are less dependent on VA mycorrhizae for nutrient acquisition (e.g., grasses) generally have less root colonization in the field than more dependent species (e.g., Citrus). Among closely related Citrus genotypes, there is a greater tendency for less dependent species to limit the rate but not the extent of colonization, even in high-P soils. We hypothesize that colonization represents a significant carbon cost that may be regulated by the host genotype. Carbon expenditure on the fungus at high P may result in mycorrhizal-induced growth depression. The potential value of breeding plants for greater susceptibility to colonization will depend on the cost/benefit of VA mycorrhizae for the specific crop, soil and environmental conditions. Although the genetics and physiology of host control over VAM colonization are barely known, recently discovered mycorrhizal colonization mutants (myc-) of pea offer great promise for the study of host-fungus compatibility.",
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Host genotype and the formation and function of VA mycorrhizae. / Graham, J. H.; Eissenstat, David.

In: Plant and Soil, Vol. 159, No. 1, 01.02.1994, p. 179-185.

Research output: Contribution to journalArticle

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