Mycorrhizal symbiosis and response of sorghum plants to combined drought and salinity stresses

Keunho Cho, Heather Toler, Jaehoon Lee, Bonnie Ownley, Jean C. Stutz, Jennifer L. Moore, Robert M. Augé

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Arbuscular mycorrhizal (AM) symbiosis can confer increased host resistance to drought stress, although the effect is unpredictable. Since AM symbiosis also frequently increases host resistance to salinity stress, and since drought and salinity stress are often linked in drying soils, we speculated that the AM influence on plant drought response may be partially the result of AM influence on salinity stress. We tested the hypothesis that AM-induced effects on drought responses would be more pronounced when plants of comparable size are exposed to drought in salinized soils. In two greenhouse experiments, several water relations characteristics were measured in sorghum plants colonized by Glomus intraradices (Gi), Gigaspora margarita (Gm) or a mixture of AM species, during a sustained drought following exposure to salinity treatments (NaCl stress, osmotic stress via concentrated macronutrients, or soil leaching). The presence of excess salt in soils widened the difference in drought responses between AM and nonAM plants in just two instances. Days required for plants to reach stomatal closure were similar for Gi and nonAM plants exposed to drought alone, but with exposure to combined NaCl and drought stress, stomates of Gi plants remained open 17-22% longer than in nonAM plants. Promotion of stomatal conductance by Gm occurred with exposure to NaCl/drought stress but not with drought alone or with soil leaching before drought. In other instances, however, the addition of salt tended to nullify an AM-induced change in drought response. Our findings confirm that AM fungi can alter host response to drought but do not lend much support to the idea that AM-induced salt resistance might help explain why AM plants can be more resilient to drought stress than their nonAM counterparts.

Original languageEnglish (US)
Pages (from-to)517-528
Number of pages12
JournalJournal of Plant Physiology
Volume163
Issue number5
DOIs
StatePublished - Mar 3 2006

Fingerprint

Sorghum
Symbiosis
Droughts
Salinity
symbiosis
salt stress
water stress
drought
Glomus intraradices
Gigaspora margarita
Soil
soil
leaching
Salts
salts
soil salts
osmotic stress
greenhouse experimentation
stomata
mycorrhizal fungi

Keywords

  • Arbuscular mycorrhizal symbiosis
  • Drought stress
  • Lethal water potential
  • Salinity stress
  • Sorghum
  • Stomatal conductance

ASJC Scopus subject areas

  • Plant Science

Cite this

Cho, K., Toler, H., Lee, J., Ownley, B., Stutz, J. C., Moore, J. L., & Augé, R. M. (2006). Mycorrhizal symbiosis and response of sorghum plants to combined drought and salinity stresses. Journal of Plant Physiology, 163(5), 517-528. https://doi.org/10.1016/j.jplph.2005.05.003

Mycorrhizal symbiosis and response of sorghum plants to combined drought and salinity stresses. / Cho, Keunho; Toler, Heather; Lee, Jaehoon; Ownley, Bonnie; Stutz, Jean C.; Moore, Jennifer L.; Augé, Robert M.

In: Journal of Plant Physiology, Vol. 163, No. 5, 03.03.2006, p. 517-528.

Research output: Contribution to journalArticle

Cho, K, Toler, H, Lee, J, Ownley, B, Stutz, JC, Moore, JL & Augé, RM 2006, 'Mycorrhizal symbiosis and response of sorghum plants to combined drought and salinity stresses', Journal of Plant Physiology, vol. 163, no. 5, pp. 517-528. https://doi.org/10.1016/j.jplph.2005.05.003
Cho, Keunho ; Toler, Heather ; Lee, Jaehoon ; Ownley, Bonnie ; Stutz, Jean C. ; Moore, Jennifer L. ; Augé, Robert M. / Mycorrhizal symbiosis and response of sorghum plants to combined drought and salinity stresses. In: Journal of Plant Physiology. 2006 ; Vol. 163, No. 5. pp. 517-528.
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