Mycorrhiza and Repeated Drought Exposure Affect Drought Resistance and Extraradical Hyphae Development of Pepper Plants Independent of Plant Size and Nutrient Content

Davies, Fred T.; Potter, John R.; Linderman, R. G.

doi:10.1016/s0176-1617(11)80339-1

Cited by 187 publications

(97 citation statements)

References 29 publications

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“…In particular, it appears likely that AMF symbiosis may influence soil moisture retention properties (Augè et al, 2001), with consequent effects on plants water relations. In addition, hyphae may increase soil-to-root contact in drying soils ( Davies et al, 1992). Better growth of AMF plants in drying soils may be related to improved exploitation of bound water, providing access to soil water below permanent wilting potential (Franson et al, 1991).…”

Section: Discussionmentioning

confidence: 99%

Improved tolerance of wheat plants (Triticum aestivum L.) to drought stress and rewatering by the arbuscular mycorrhizal fungus Glomus claroideum: effect on growth and cell membrane stability

Beltrano

Ronco

2008

Braz. J. Plant Physiol.

113

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The aim of this paper was to investigate the contribution of the arbuscular mycorrhizal fungus Glomus claroideum to drought stress tolerance in wheat plants grown under controlled conditions in a growth chamber, and subjected to moderate or severe water stress and rewatering. Water stress tolerance was determined through total dry weight, leaf relative water content, leakage of solutes and leaf chlorophyll and protein concentrations in mycorrhizal and nonmycorrhizal wheat plants. Total dry weight and leaf chlorophyll concentrations were significantly higher in mycorrhizal plants after moderate or severe water stress treatments compared with non-mycorrhizal ones. Electrolyte leakage was significantly lower in water-stressed inoculated plants. Compared to non-inoculated plants, leaf relative water content and total protein concentration of inoculated individuals increased only under severe water stress. When irrigation was re-established, mycorrhizal plants increased their total dry weight and leaf chlorophyll concentration, and recovered cell membrane permeability in leaves compared with non-mycorrhizal plants. In conclusion, root colonization by G. claroideum could be an adequate strategy to alleviate the deleterious effects of drought stress and retard the senescence syndrome in wheat. Key words: mycorrhizae, relative water content, rewatering, solute leakage, water deficit A melhoria da tolerância do trigo (Triticum aestivum L.) ao estresse hídrico e à reidratação pelo fungo micorrízico arbuscular (Glomus claroideum): Efeito sobre o crescimento e estabilidade das membranas celulares: O objetivo do trabalho foi pesquisar a contribuição do fungo micorrízico arbuscular Glomus claroideum à tolerância ao déficit hídrico em plantas de trigo cultivadas sob condições controladas em uma câmara de crescimento, submetidas ao estresse hídrico moderado ou severo e reidratação. A tolerância das plantas ao estresse hídrico foi determinada mediante o peso seco total, conteúdo relativo de água foliar, extravasamento de solutos e concentrações foliares de clorofilas e proteínas totais nas plantas de trigo micorrizadas e não-micorrizadas. O peso seco total e a concentração de clorofila foram significativamente maiores nas plantas micorrizadas sob estresse hídrico moderado ou severo, quando comparadas com as não-micorrizadas. O extravasamento de solutos foi significativamente menor nas plantas inoculadas estressadas. O conteúdo relativo de água foliar e a concentração de proteínas totais nas plantas inoculadas aumentaram apenas em condições de estresse hídrico severo. Após a re-irrigação, nas plantas micorrizadas, houve aumento do peso seco total e da concentração de clorofilas, além da recuperação da integridade das membranas celulares, quando comparadas com as plantas não-micorrizadas. Em suma, a colonização das raízes por G. claroideum poderia ser uma estratégia adequada para reduzir os efeitos deletérios do estresse hídrico e retardar a síndrome da senescência em trigo. Palavras-chave: conteúdo relativo de água, déficit hídri...

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Section: Discussionmentioning

confidence: 99%

Improved tolerance of wheat plants (Triticum aestivum L.) to drought stress and rewatering by the arbuscular mycorrhizal fungus Glomus claroideum: effect on growth and cell membrane stability

Beltrano

Ronco

2008

Braz. J. Plant Physiol.

113

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“…Soil hyphae could conceivably impact plant water balance in drying soils by contributing to root water absorption (Faber et al 1991;Ruiz-Lozano and Azcón 1995), by improving contact between roots and soil particles (Reid 1979), or by altering the soil moisture characteristic as described above. Davies et al (1992) observed that development of extraradical hyphae in AM soils was associated with greater drought resistance of plants growing in those soils.…”

Section: Testing Contributions Of Soil Andmentioning

confidence: 95%

“…More soil water at a particular low soil Ψ might explain how AM plants have wilted at lower soil Ψ (Hardie and Leyton 1981), maintained turgor to lower soil Ψ (Augé et al 1986), developed lower soil Ψ at the permanent wilting point (Bethlenfalvay et al 1988a, b) or maintained higher shoot water status at low soil Ψ or θ (Osonubi 1994;Duan et al 1996) than nonmycorrhizal plants. Correlative evidence has linked soil aggregation with increased drought resistance (Davies et al 1992). Physiologically, mycorrhizae-mediated uptake of bound soil water may be analogous to the uptake of phosphorus, where tapping supplies not available to the nonAM plant results in a positive growth response (Bethlenfalvay and Schüepp 1994).…”

Section: Mycorrhizae and Soil Water Relationsmentioning

confidence: 99%

“…In addition to the possibility of direct hyphal contributions to root water uptake (Hardie 1985;Faber et al 1991;Ruiz-Lozano and Azcón 1995), soil hyphae may increase soil-to-root contact in drying soils (e.g., Reid 1979;Fitter 1985;Davies et al 1992). Root and soil shrinkage creates gaps between the root and the soil, which can decrease water absorption (e.g., Nobel and Cui 1992).…”

Section: Testing Contributions Of Soil Andmentioning

confidence: 99%

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Arbuscular mycorrhizae and soil/plant water relations

Augé¹

2004

Can. J. Soil. Sci.

359

165

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Augé, R. M. 2004. Arbuscular mycorrhizae and soil/plant water relations. Can. J. Soil Sci. 84: 373-381. The water relations of arbuscular mycorrhizal (AM) plants have been compared often. However, virtually nothing is known about the comparative water relations of AM and nonAM soils or about the relative influence of AM colonization of soil vs. AM colonization of plants on host water balance. In this review, I summarize findings that support the assertion that colonization of soil may play as important a role as colonization of roots regarding how AM symbiosis affects the water relations of host plants. We observed a slight but significant AM effect on the soil moisture characteristic curve of a Sequatchie fine sandy loam following 7 mo of mycorrhization by Glomus intraradices/Vigna unguiculata. In a separate study, few AM effects on either the wet or dry hysteretic curves were discernible after 12 mo of mycorrhization by G. intraradices or Gigaspora margarita on roots of Phaseolus vulgaris. Using myc-bean mutants, we determined that about half of the considerable promotion of stomatal conductance by G. intraradices and Gi. margarita was attributable to soil colonization and about half to plant colonization. A path analysis modeling approach revealed that soil hyphal colonization had larger direct and total effects on dehydration tolerance of bean than did root hyphal colonization or several other soil or plant variables. Key words:Mycorrhizal symbiosis, soil moisture characteristic, stomatal conductance, water relations Augé, R. M. 2004. Les mycorhizes à arbuscules et leurs liens avec la teneur en eau dans le sol ou la plante. Can. J. Soil Sci. 84: 373-381. On compare souvent les relations hydriques des plantes colonisées par les mycorhizes à arbuscules (MA). Toutefois, on ignore presque tout des relations hydriques des sols à MA et sans MA et de l'influence relative de la colonisation du sol par les MA sur le bilan hydrique de l'hôte par rapport à la colonisation des plantes par les MA. Dans cet article, l'auteur résume les constatations étayant l'affirmation que la colonisation du sol pourrait s'avérer aussi importante que la colonisation des racines quant à l'incidence des MA symbiotiques sur les rapports de la plante hôte avec l'eau. Après sept mois de colonisation par les mycorhizes de Glomus intraradices/Vigna unguiculata, on observe une légère mais significative incidence des MA sur la courbe des paramètres hydriques dans un fin loam sablonneux Sequatchie. Dans le cadre d'une autre étude, les MA ont eu peu d'effets discernables sur la courbe de l'hystérésis en sol sec ou humide après 12 mois de colonisation des racines de Phaseolus vulgaris par les mycorhizes de G. intraradices ou de Gigaspora margarita. L'utilisation de haricots mutants de type myc-révèle qu'on doit environ la moitié de la très forte promotion de la conductance des stomates par G. intraradices et Gigaspora margarita à la colonisation du sol et l'autre moitié à la colonisation de la plante. L'analyse causale par modélisation indique que ...

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“…[9] Mycorrhiza increase nutrient and water uptake, alleviate cultural and environmental stresses, and enhance disease resistance and plant health. [14][15][16][17][18][19] An important arbuscular mycorrhizal genus is Glomus, which colonize a variety of host species, [6] including sunflower. [20] Mycorrhizal fungi are a direct link between soil and roots, and consequently of great importance in phytoremediation-potentially enhancing heavy metal availability and plant tolerance.…”

Section: Introductionmentioning

confidence: 99%

Mycorrhizal Fungi Increase Chromium Uptake by Sunflower Plants: Influence on Tissue Mineral Concentration, Growth, and Gas Exchange

Davies

Puryear

Newton

et al. 2002

Journal of Plant Nutrition

176

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As a potential phytoremediation system for phytoextraction of chromium (Cr), we evaluated the influence of the arbuscular mycorrhizal fungus Glomus intraradices on leaf tissue elemental composition, growth and gas exchange of sunflower (Helianthus annuus L.). Sunflower seedlings were either inoculated with mycorrhizal fungi (AM) or non-inoculated (Non-AM) and then exposed to two Cr species: {12 mmol of trivalent cation (Cr þ3 ) [Cr(III)] or 0.1 mmol of divalent dichromate anion (Cr 2 O 7 À ) [Cr(VI)]}. Both Cr species depressed plant growth, decreased stomatal conductance (g s ) and net photosynthesis (A).

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Mycorrhiza and Repeated Drought Exposure Affect Drought Resistance and Extraradical Hyphae Development of Pepper Plants Independent of Plant Size and Nutrient Content

Cited by 187 publications

References 29 publications

Improved tolerance of wheat plants (Triticum aestivum L.) to drought stress and rewatering by the arbuscular mycorrhizal fungus Glomus claroideum: effect on growth and cell membrane stability

Improved tolerance of wheat plants (Triticum aestivum L.) to drought stress and rewatering by the arbuscular mycorrhizal fungus Glomus claroideum: effect on growth and cell membrane stability

Arbuscular mycorrhizae and soil/plant water relations

Mycorrhizal Fungi Increase Chromium Uptake by Sunflower Plants: Influence on Tissue Mineral Concentration, Growth, and Gas Exchange

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