Leaf elongation and water relations of mycorrhizal sorghum in response to partial soil drying: two<i>Glomus</i>species at varying phosphorus fertilization

Augé, Robert M.; Stodola, Ann J.W.; Ebel, Robert C.; Duan, Xiangrong

doi:10.1093/jxb/46.3.297

Cited by 41 publications

(21 citation statements)

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“…Mycorrhizal symbiosis has modified host hormonal relations Danneberg et al 1992;Goicoechea et al 1997a;Nikolaou et al 2003), and we investigated the possibility that mycorrhizal fungi, which are confined to outer root tissues, were affecting distant organs like leaf stomata by changing the hormonal flow of information from roots to shoots in the transpiration stream. Working with maize, sorghum and cowpea, we did not observe much effect of mycorrhizal symbiosis on g s or plant water relations under conditions where strictly nonhydraulic signaling of soil drying prevailed Ebel et al 1994;Augé et al 1995).…”

Section: Mycorrhizae and Plant Water Relationscontrasting

confidence: 56%

Arbuscular mycorrhizae and soil/plant water relations

Augé¹

2004

Can. J. Soil. Sci.

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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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Section: Mycorrhizae and Plant Water Relationscontrasting

confidence: 56%

Arbuscular mycorrhizae and soil/plant water relations

Augé¹

2004

Can. J. Soil. Sci.

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359

165

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“…Stomatal conductance in AM plants has also remained unaffected by declines in available soil moisture longer than in nonAM plants (Osundina 1995;Duan et al 1996). Furthermore, AM plants showed higher gs than nonAM plants when only a portion of a root system was dried and before drying affected leaf water status and these effects occurred independently of plant size or phosphorus nutrition through nonhydraulic signals (Augé et al 1992b(Augé et al , 1994(Augé et al , 1995. In this context, it has been shown that when AM and nonAM plants were exposed to similar soil water deficits, gs of AM and nonAM plants were still different, suggesting also that the AM influence on gs is of biochemical nature (Augé 2000).…”

Section: Stomatal Behaviour Of Arbuscular Mycorrhizal Plants Under Osmentioning

confidence: 99%

Host Response to Osmotic Stresses: Stomatal Behaviour and Water Use Efficiency of Arbuscular Mycorrhizal Plants

Ruíz-Lozano

Aroca

2010

Arbuscular Mycorrhizas: Physiology and Function

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Arbuscular mycorrhizal (AM) symbiosis can protect the host plants against the detrimental effects of the water deficit caused by osmotic stresses such as drought and salinity. Stomatal conductance (gs) and water use efficiency (WUE) are among the most studied water relations parameters in the mycorrhizal literature, since they are considered critical to the long-term performance of host plants in semiarid environments. Mycorrhizal effects on gs have been observed in about 50% of experiments involving AM and nonAM plants of similar size. In fact, gs rates usually are higher in AM than in nonAM plants, which implies that AM plants have a lower resistance to vapour transfer from inside the leaves to the atmosphere. AM and nonAM plants have also shown different critical points or thresholds of stomatal behaviour during drought episodes. The higher gs rates in AM plants have been associated with lower xylem-sap abscisic acid (ABA) and lower ABA fluxes to leaves in AM plants. On the other hand, it has been suggested that extraradical hyphae or increased root branching may allow mycorrhizal roots to better explore a particular soil volume, extending soil water depletion zones and giving a mycorrhizal root system more access to available water. In addition, it has been estimated that about half of the promotion of gs by AM fungi can be attributable to the soil colonization by AM fungi. Nevertheless, these results can vary when the host plant shows a water conservative strategy. Moreover, different AM fungal species have been shown to modulate also differently the physiological response, including gs, of host plant to drought. The AM influence on gs can also be modulated by environmental conditions such as irradiance, air temperature or leaf temperature. There are also several reports in the literature showing an increase of plant WUE by the AM symbiosis either under well watered or under osmotic stress conditions. The effects of AM symbiosis on WUE depend on the fungal species involved, without a correlation with the percentage of root infection. These effects have been rather related to higher net photosynthetic rate and optimal quantum yield of photosystem II in AM plants than in nonAM ones and with enhanced activities of carbon assimilatory enzymes such as Rubisco. In any case, specific studies dealing with the effect of AM symbiosis on leaf morphology are needed in order to ascertain how these parameters influence the WUE of the host plant.

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“…(1)-(3), but comes naturally from the OhmÕs law formulation. Split-root experiments have indicated that values of the parameter c can range from one to more than two (e.g., 26,19,1,14,6,12,37]). Fig.…”

Section: Introductionmentioning

confidence: 99%

Soil-moisture limits on plant uptake: An upscaled relationship for water-limited ecosystems

Guswa

2005

Advances in Water Resources

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Leaf elongation and water relations of mycorrhizal sorghum in response to partial soil drying: twoGlomusspecies at varying phosphorus fertilization

Cited by 41 publications

References 0 publications

Arbuscular mycorrhizae and soil/plant water relations

Arbuscular mycorrhizae and soil/plant water relations

Host Response to Osmotic Stresses: Stomatal Behaviour and Water Use Efficiency of Arbuscular Mycorrhizal Plants

Soil-moisture limits on plant uptake: An upscaled relationship for water-limited ecosystems

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