Relationship of mycorrhizal growth enhancement and plant growth with soil water and texture

Dakessian, S.; Brown, Milford S.; Bethlenfalvay, Gábor J.

doi:10.1007/bf02374337

Cited by 19 publications

(8 citation statements)

References 16 publications

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“…Recently, evidence for water as an important factor has also been presented (Hardie 1985). We have indirect evidence suggesting that unavailable soil water (soil water at potentials below those associated with permanent wilting) may be involved in the VAM growth response (Dakessian et al 1986). This prompted us to investigate further the rela- tionship between the development of the VAM symbionts and soil water status.…”

Section: Introductionmentioning

confidence: 79%

Effects of drought on host and endophyte development in mycorrhizal soybeans in relation to water use and phosphate uptake

Bethlenfalvay¹,

Brown²,

Ames³

et al. 1988

Physiologia Plantarum

117

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1988. Effects of drought on host and endophyte development in mycorrhizal soybeans in relation to water use and phosphate uptake. -Physiol. Plant. 72: 565-571. Soybean [Glycine max (L.) Merr.] plants were grown in pot cultures and inoculated with the vesicular-arbuscular mycorrhizal (VAM) fungus GIomus mosseae (Nicol. & Gerd.) Gerd. and Trappe or provided with P fertilizer (non-VAM plants). After an initial growth period (21 days), plants were exposed to cycles of severe, moderate or no drought stress over a subsequent 28-day period by rewatering at soil water potentials of -1.0, -0.3 or -0.05 MPa. Dry weights of VAM plants were greater at severe stress and smaller at no stress than those of non-VAM plants. Phosphorus fertilization was applied to produce VAM and non-VAM plants of the same size at moderate stress. Root and leaf P concentrations were higher in non-VAM plants at all stress levels. All plants were stressed to permanent wilting prior to harvest. VAM plants had lower soil moisture content at harvest than non-VAM plants. Colonization of roots by G. mosseae did not vary with stress, but the biomass and length of the extraradical mycelium was greater in severely stressed than in non-stressed plants. Growth enhancement of VAM plants relative to P-fertilized non-VAM plants under severe stress was attributed to increased uptake of water as well as to more efficient P uptake. The ability of VAM plants to deplete soil water to a greater extent than non-VAM plants suggests lower permanent wilting potentials for the former.

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Section: Introductionmentioning

confidence: 79%

Effects of drought on host and endophyte development in mycorrhizal soybeans in relation to water use and phosphate uptake

Bethlenfalvay¹,

Brown²,

Ames³

et al. 1988

Physiologia Plantarum

117

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show abstract

“…In osmotic stress studies and other physiological areas of mycorrhizal investigation, AM effects have often not been well-correlated with degree of root colonization (e.g., Dakessian et al, 1986 ; Fitter and Merryweather, 1992 ; Ruiz-Lozano et al, 1995 ). We explored this relationship for shoot K + /Na + ratio, the summary effect most affected by AM symbiosis among the 22 examined, and did find a significant association with root colonization.…”

Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal symbiosis and osmotic adjustment in response to NaCl stress: a meta-analysis

2014

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Arbuscular mycorrhizal (AM) symbiosis can enhance plant resistance to NaCl stress in several ways. Two fundamental roles involve osmotic and ionic adjustment. By stimulating accumulation of solutes, the symbiosis can help plants sustain optimal water balance and diminish Na+ toxicity. The size of the AM effect on osmolytes has varied widely and is unpredictable. We conducted a meta-analysis to determine the size of the AM effect on 22 plant solute characteristics after exposure to NaCl and to examine how experimental conditions have influenced the AM effect. Viewed across studies, AM symbioses have had marked effects on plant K+, increasing root and shoot K+ concentrations by an average of 47 and 42%, respectively, and root and shoot K+/Na+ ratios by 47 and 58%, respectively. Among organic solutes, soluble carbohydrates have been most impacted, with AM-induced increases of 28 and 19% in shoots and roots. The symbiosis has had no consistent effect on several characteristics, including root glycine betaine concentration, root or shoot Cl− concentrations, leaf Ψπ, or shoot proline or polyamine concentrations. The AM effect has been very small for shoot Ca++ concentration and root concentrations of Na+, Mg++ and proline. Interpretations about AM-conferred benefits regarding these compounds may be best gauged within the context of the individual studies. Shoot and root K+/Na+ ratios and root proline concentration showed significant between-study heterogeneity, and we examined nine moderator variables to explore what might explain the differences in mycorrhizal effects on these parameters. Moderators with significant impacts included AM taxa, host type, presence or absence of AM growth promotion, stress severity, and whether NaCl constituted part or all of the experimental saline stress treatment. Meta-regression of shoot K+/Na+ ratio showed a positive response to root colonization, and root K+/Na+ ratio a negative response to time of exposure to NaCl.

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“…AM sorghum was also able to maintain leaf Ψ to lower soil Ψ than similarly-sized nonAM plants (Osonubi 1994). Dakessian et al (1986), Bethlenfalvay et al (1988 b) and Franson et al (1991) have provided evidence that AM plants apparently have access to soil water below the permanent wilting Ψ of nonAM plants.…”

Section: Mycorrhizal Colonization and Plant Water Relationsmentioning

confidence: 96%

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

Augé

Moore

Cho

et al. 2003

Journal of Plant Physiology

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Relationship of mycorrhizal growth enhancement and plant growth with soil water and texture

Cited by 19 publications

References 16 publications

Effects of drought on host and endophyte development in mycorrhizal soybeans in relation to water use and phosphate uptake

Effects of drought on host and endophyte development in mycorrhizal soybeans in relation to water use and phosphate uptake

Arbuscular mycorrhizal symbiosis and osmotic adjustment in response to NaCl stress: a meta-analysis

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

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