Relating foliar dehydration tolerance of mycorrhizal Phaseolus vulgaris to soil and root colonization by hyphae

Robert M. Augé, Jennifer L. Moore, Keunho Cho, Jean C. Stutz, David M. Sylvia, Abid K. Al-Agely, Arnold M. Saxton

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Mycorrhizal symbiosis can modify plant response to drying soil, but little is known about the relative contribution of soil vs. root hyphal colonization to drought resistance of mycorrhizal plants. Foliar dehydration tolerance, characterized as leaf and soil water potential at the end of a lethal drying episode, was measured in bean plants (Phaseolus vulgaris) colonized by Glomus intraradices or by a mix of arbuscular mycorrhizal fungi collected from a semi-arid grassland. Path analysis modeling was used to evaluate how colonization rates and other variables affected these lethal values. Of several plant and soil characteristics tested, variation in dehydration tolerance was best explained by soil hyphal density. Soil hyphal colonization had larger direct and total effects on both lethal leaf water potential and soil water potential than did root hyphal colonization, root density, soil aggregation, soil glomalin concentration, leaf phosphorus concentration or leaf osmotic potential. Plants colonized by the semi-arid mix of mycorrhizal fungi had lower lethal leaf water potential and soil water potential than plants colonized by G. intraradices. Our findings support the assertion that external, soil hyphae may play an important role in mycorrhizal influence on the water relations of host plants.

Original languageEnglish (US)
Pages (from-to)1147-1156
Number of pages10
JournalJournal of Plant Physiology
Volume160
Issue number10
DOIs
StatePublished - 2003

Fingerprint

Phaseolus
Hyphae
desiccation (plant physiology)
Dehydration
hyphae
Phaseolus vulgaris
Soil
soil water potential
leaf water potential
soil aggregation
Glomus intraradices
soil
mycorrhizal fungi
Water
drying
glomalin
soil density
osmotic pressure
drought tolerance
symbiosis

Keywords

  • Arbuscular mycorrhizal symbiosis
  • Drought resistance
  • Lethal water potential
  • Path analysis
  • Phaseolus vulgaris (bean)
  • Root colonization
  • Soil hyphal density

ASJC Scopus subject areas

  • Plant Science

Cite this

Augé, R. M., Moore, J. L., Cho, K., Stutz, J. C., Sylvia, D. M., Al-Agely, A. K., & Saxton, A. M. (2003). Relating foliar dehydration tolerance of mycorrhizal Phaseolus vulgaris to soil and root colonization by hyphae. Journal of Plant Physiology, 160(10), 1147-1156. https://doi.org/10.1078/0176-1617-01154

Relating foliar dehydration tolerance of mycorrhizal Phaseolus vulgaris to soil and root colonization by hyphae. / Augé, Robert M.; Moore, Jennifer L.; Cho, Keunho; Stutz, Jean C.; Sylvia, David M.; Al-Agely, Abid K.; Saxton, Arnold M.

In: Journal of Plant Physiology, Vol. 160, No. 10, 2003, p. 1147-1156.

Research output: Contribution to journalArticle

Augé, RM, Moore, JL, Cho, K, Stutz, JC, Sylvia, DM, Al-Agely, AK & Saxton, AM 2003, 'Relating foliar dehydration tolerance of mycorrhizal Phaseolus vulgaris to soil and root colonization by hyphae', Journal of Plant Physiology, vol. 160, no. 10, pp. 1147-1156. https://doi.org/10.1078/0176-1617-01154
Augé, Robert M. ; Moore, Jennifer L. ; Cho, Keunho ; Stutz, Jean C. ; Sylvia, David M. ; Al-Agely, Abid K. ; Saxton, Arnold M. / Relating foliar dehydration tolerance of mycorrhizal Phaseolus vulgaris to soil and root colonization by hyphae. In: Journal of Plant Physiology. 2003 ; Vol. 160, No. 10. pp. 1147-1156.
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