Influence of Soil Water Status on Arbuscular Mycorrhizas in Three Perennial Grasses in Central Argentina

Busso, Carlos; Bolletta, Andrea; Flemmer, Andrea; Montani, Tomás

doi:10.5735/085.045.0602

Cited by 7 publications

(4 citation statements)

References 50 publications

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“…Percentage mycorrhizal colonization on Nassella longiglumis and N. tenuis at the "Monte" and the experimental plots at the vegetative morphological stage of development are similar to values found in these species by another two studies, one conducted in the same study site than ours [23], and the other in a semiarid zone of central Argentina [24]. AM colonization in A. ambigua was greater than that in N. longiglumis at the reproductive stage of developmental morphology, which agrees with other results found in these species [23].…”

Section: Discussionsupporting

confidence: 84%

Plant Species Richness and Developmental Morphology Stage Influence Mycorrhizal Patagonia Plants Root Colonization

et al. 2018

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The objectives of this study were to determine the percentage of root colonization by arbuscular mycorrhizal (AM) fungi at various levels of plant species richness and developmental morphology stages in various perennial grass, and herbaceous and woody dicots species using experimental plots during 2013 and 2014. An auger was used to obtain six replicate root + soil samples at each sampling time on each of the study parameters. Roots were washed free of soil, and percentage AM was determined. The shrub Larrea divaricata was the species which showed the lowest percentage of colonization by AM at the vegetative developmental morphology stage at the monocultures and six-species-mixtures on the experimental plots. Dicots, but not grass, species showed a greater percentage colonization by AM fungi at the greatest (i.e., six-species-mixtures) than lowest (i.e., monocultures) species richness. Although at different degrees of species richness and developmental morphology stages, the perennial grasses Nassella longiglumis and N. tenuis, the herbaceous dicot Atriplex semibaccata, and the shrubs L. divaricata and Schinus fasciculatus showed a greater (p < 0.050) percentage colonization by AM fungi during the second than the first study year. Even though it was speciesand sampling time-dependent, percentage colonization by AM fungi increased as species richness also increased most of the times. Our results demonstrated that the plant species differences in percentage colonization by AM fungi in the experimental plots were species richness-, developmental morphology stage-, and sampling-time dependents.

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Section: Discussionsupporting

confidence: 84%

Plant Species Richness and Developmental Morphology Stage Influence Mycorrhizal Patagonia Plants Root Colonization

et al. 2018

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“…Mycorrhizal fungi play an important role in uptake of nutrients (particularly phosphorus), stimulate plant growth and productivity, increase drought tolerance and subsequent recovery from water stress, improve water use efficiency and the ability of plants to extract water from the soil, and offer protection against soil-borne pathogens (Barea et al 2005; Boomsma and Vyn 2008; Kaya et al 2003; Johansson et al 2004; Subramanian et al 1995). SMS has been reported to influence mycorrhizal colonization in some but not all plant species (Busso et al 2008; Wu and Xia 2006). While it has been reported that hound’s-tongue is a mycorrhizal weed (Pendleton and Smith 1983), whether SMS influences colonization of roots of this weed by arbuscular, vesicular mycorrhizal fungus is not known.…”

mentioning

confidence: 99%

Influence of Soil Moisture Stress on Vegetative Growth and Mycorrhizal Colonization in Hound’s-tongue (Cynoglossum officinale)

Momayyezi

Upadhyaya

2016

Weed Sci

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Hound's-tongue is an invasive, biennial weed that thrives in dry rangelands of British Columbia. Rosette formation in the first year of growth and a deep root system offer this weed a competitive advantage against associated grasses under dry conditions. To study effects of water stress on seedling growth and mycorrhizal colonization in hound's-tongue, seedlings of this weed were grown in pots in a greenhouse and subjected to four (100, 80, 60, and 40% of field capacity) soil moisture treatments. Effects of soil moisture stress (SMS) on several growth parameters as well as mycorrhizal colonization of roots were studied. The total biomass, shoot and root fresh and dry weights, leaf number, petiole length, leaf area, and specific leaf weight (leaf dry weight per unit leaf area) decreased with increasing SMS; shoot and root water content was not affected. Because of a greater effect of SMS on root compared with the shoot biomass, shoot:root ratio increased as the moisture stress increased. Water stress decreased mycorrhizal colonization and arbuscule and vesicle abundance. A reduction in total biomass, leaf number and leaf area per plant, petiole length, and mycorrhizal colonization may reduce the competitive advantage of hound's-tongue over its neighbors under drought conditions. The effect on plant size may also influence herbivory, by biocontrol agents and other herbivores, and fecundity of this weed. Nomenclature: Hound's-tongue, Cynoglossum officinale L.

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“…Indeed, studies have reported increases or decreases in AMF levels under drought (as reviewed in Mohan et al 2014) or no changes (e.g. Wallace 1987;Busso et al 2008) in AMF colonization levels, suggesting that factors other than resource availability may also play a role in influencing AMF levels in plant roots.…”

Section: Discussionmentioning

confidence: 99%

“…AMF colonization levels have been demonstrated to be variable even between species belonging to the same genus (Busso et al 2008). Host species variation in mycorrhizal responses can be attributed to possible differences in mycotrophy (Gange et al 2002), nutrient demand (Fosaa & Olsen 2007), or differences in competitive ability in general (Busso et al 2008), or grazing induced changes in the AMF community itself (Ba et al 2012;Antoninka et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Response of mycorrhizae to herbivory and soil moisture in a semiarid grazing ecosystem

Tiruvaimozhi

Bagchi

Sankaran

2020

Preprint

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Arbuscular mycorrhizal fungal (AMF) symbioses with plants can be influenced by top-down forces such as grazing, and also by bottom-up forces such as soil resource availability, both of which are being altered by anthropogenic and global change drivers. While the influence of each of these factors on AMF symbioses has been widely studied, explicit tests of the relative strengths of top-down versus bottom-up influences on these ubiquitous plant root symbioses are few. We studied AMF colonization responses of four species of graminoids (3 grasses Elymus longae-aristatus, Leymus secalinus and Stipa orientalis, and a sedge Carex melanantha) common to semiarid high-altitude rangelands of the Spiti region, Trans-Himalaya, to changes in a top-down driver, grazing intensity (through short-term clipping and long-term grazer exclusion experiments), and a bottom-up driver, water availability (using irrigation treatments, and by evaluating responses to annual precipitation levels across years). Over three years, AMF colonization in all four host species was influenced by precipitation, with the highest and lowest AMF colonization levels corresponding to years with the lowest and highest rainfall, respectively. However, responses to long-term grazer exclusion differed among host species, and across years: while some species showed decreases in AMF colonization levels under grazing, others showed increases from ungrazed control levels, and these responses changed, even reversed, across years. Responses to short-term clipping and irrigation treatments also differed among hosts, with some species responding to irrigation alone, some to clipping and irrigation combined, and others showing no changes in AMF colonization from control levels in any of the treatments. In our study, long-term changes in water availability influenced AMF colonization levels, while short-term responses were host specific. Responses to above-ground tissue loss, however, differed among host species both in the long- and short-term. Overall, this study demonstrates that while AMF colonization levels correspond to annual precipitation levels in this semiarid ecosystem, host species also play a role in influencing plant-AMF interactions in these rangelands, with colonization levels and responses to abiotic factors changing with host species.

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Influence of Soil Water Status on Arbuscular Mycorrhizas in Three Perennial Grasses in Central Argentina

Cited by 7 publications

References 50 publications

Plant Species Richness and Developmental Morphology Stage Influence Mycorrhizal Patagonia Plants Root Colonization

Plant Species Richness and Developmental Morphology Stage Influence Mycorrhizal Patagonia Plants Root Colonization

Influence of Soil Moisture Stress on Vegetative Growth and Mycorrhizal Colonization in Hound’s-tongue (Cynoglossum officinale)

Response of mycorrhizae to herbivory and soil moisture in a semiarid grazing ecosystem

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