Colonization patterns in a mycorrhiza‐defective mutant tomato vary with different arbuscular‐mycorrhizal fungi

Ll, Gao; Delp, Gabriele; Smith, S E

doi:10.1046/j.0028-646x.2001.00193.x

Cited by 79 publications

(66 citation statements)

References 32 publications

(104 reference statements)

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“…AM association has been shown to induce modifications in root system architecture and in root morphogenesis (Berta et al 1990;Schellenbaum et al 1991;Bouma et al 2001). The effects seem to be dependent on fungus and plant species, as well as on environmental conditions (Smith and Read 1997;Bouma et al 2001;Gao et al 2001). Root architecture of carob seedlings seemed to be more responsive to nutrient levels than to AM association.…”

Section: Discussionmentioning

confidence: 99%

Functional aspects of root architecture and mycorrhizal inoculation with respect to nutrient uptake capacity

Cruz

Green²,

Watson³

et al. 2003

Mycorrhiza

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The aim of this research was to investigate the effect of arbuscular mycorrhizal (AM) colonisation on root morphology and nitrogen uptake capacity of carob (Ceratonia siliqua L.) under high and low nutrient conditions. The experimental design was a factorial arrangement of presence/absence of mycorrhizal fungus inoculation (Glomus intraradices) and high/low nutrient status. Percent AM colonisation, nitrate and ammonium uptake capacity, and nitrogen and phosphorus contents were determined in 3-month-old seedlings. Grayscale and colour images were used to study root morphology and topology, and to assess the relation between root pigmentation and physiological activities. AM colonisation lead to a higher allocation of biomass to white and yellow parts of the root. Inorganic nitrogen uptake capacity per unit root length and nitrogen content were greatest in AM colonised plants grown under low nutrient conditions. A better match was found between plant nitrogen content and biomass accumulation, than between plant phosphorus content and biomass accumulation. It is suggested that the increase in nutrient uptake capacity of AM colonised roots is dependent both on changes in root morphology and physiological uptake potential. This study contributes to an understanding of the role of AM fungi and root morphology in plant nutrient uptake and shows that AM colonisation improves the nitrogen nutrition of plants, mainly when growing at low levels of nutrients.

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Section: Discussionmentioning

confidence: 99%

Functional aspects of root architecture and mycorrhizal inoculation with respect to nutrient uptake capacity

Cruz

Green²,

Watson³

et al. 2003

Mycorrhiza

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show abstract

“…Our findings are consistent with those of Gao (2002) Colonisation in the inoculated nurse plants (A. porrum) was relatively high at both harvests, indicating that inoculum potential in the nurse pots was not likely to have influenced relative colonisation of rmc by the two fungi. Previous work has shown that A. porrum nurse plants with colonisation between 40 and 90% are capable of initiating extensive colonisation of the wild-type progenitor of rmc (Cavagnaro et al, 2001a;Gao et al, 2001). The differential colonisation of A. porrum by G. sp.…”

Section: Colonisationmentioning

confidence: 97%

“…The inoculum was derived from pot cultures of Glomus coronatum Giovannetti (WUM 16) or Glomus sp. WFVAM 23 (referred to as G. versiforme (Karsten) Berch in Gao et al ., 2001;Cavagnaro et al ., 2001a) raised on leek ( Allium porrum L . cv.…”

Section: Soil Fungi and Plantsmentioning

confidence: 99%

“…G. coronatum ) and one fungus Glomus sp. WFVAM 23 (referred to as Glomus versiforme by Cavagnaro et al ., 2001a;Gao et al ., 2001) was able to form near-normal colonisation, including the formation of arbuscules (Gao et al ., 2001). The variation between fungi in overcoming the blocks to colonisation resulting from the mutation clearly indicates that the fungal genome plays a significant role in determining the outcome of symbiotic interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Studies of the fungal colonisation patterns in AM-defective mutants of several plant species have revealed that genetic control of colonisation can operate at several steps: prior to contact of the root by the fungus (David-Schwartz et al ., 2001;David-Schwartz et al ., 2003), at the point of epidermal contact and penetration (Duc et al ., 1989;Bradbury et al ., 1993;Gao et al ., 2001), at the boundary between hypodermis and cortical cells (Bonfante et al ., 2000;Gao et al ., 2001) and also at the point at which the fungi penetrate root cortical cells and form arbuscules (Gianinazzi-Pearson et al ., 1991). It has been suggested that plant defence mechanisms, which are not extensively deployed in normal, wild-type interactions (Harrison, 1999), may be involved in the exclusion of AM fungi from mutant plants (Gao, 2002;Garcia-Garrido & Ocampo, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Interactions between arbuscular mycorrhizal fungi and a mycorrhiza‐defective mutant tomato: does a noninfective fungus alter the ability of an infective fungus to colonise the roots – and vice versa?

Cavagnaro

Smith

2004

New Phytologist

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Summary• We have investigated whether inoculation of a mycorrhiza-defective mutant ( rmc ) of tomato ( Lycopersicon esculentum ) with an individual arbuscular mycorrhizal (AM) fungal species affects subsequent colonisation by another AM fungal species that has different infectivity when presented alone. Inoculum was provided by leek ( Allium porrum ) growing in 'nurse pots' into which rmc seedlings were planted, and between which they were subsequently transferred.• Inoculation with Glomus coronatum , an AM fungal species that has low infectivity towards rmc , did not prevent colonisation by Glomus sp. WFVAM 23 (identified as G. versiforme in our previous studies). Also, colonisation by G. sp. WFVAM 23 did not facilitate colonisation by G. coronatum .• The results show that the mechanism by which rmc prevents cortical colonisation by most AM fungi is not dependent on, or modified by, prior plant interactions with individual AM fungal species. The two fungi used here clearly perceive the outcome of the mutation differently.• Growth responses of rmc after sequential inoculation with the two AM fungi are briefly analysed in terms of competition for limiting soil nutrient resources with the nurse plants.

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Community composition of root‐associated fungi in a Quercus‐dominated temperate forest: “codominance” of mycorrhizal and root‐endophytic fungi

Toju

Yamamoto

Sato

et al. 2013

Ecology and Evolution

125

126

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In terrestrial ecosystems, plant roots are colonized by various clades of mycorrhizal and endophytic fungi. Focused on the root systems of an oak-dominated temperate forest in Japan, we used 454 pyrosequencing to explore how phylogenetically diverse fungi constitute an ecological community of multiple ecotypes. In total, 345 operational taxonomic units (OTUs) of fungi were found from 159 terminal-root samples from 12 plant species occurring in the forest. Due to the dominance of an oak species (Quercus serrata), diverse ectomycorrhizal clades such as Russula, Lactarius, Cortinarius, Tomentella, Amanita, Boletus, and Cenococcum were observed. Unexpectedly, the root-associated fungal community was dominated by root-endophytic ascomycetes in Helotiales, Chaetothyriales, and Rhytismatales. Overall, 55.3% of root samples were colonized by both the commonly observed ascomycetes and ectomycorrhizal fungi; 75.0% of the root samples of the dominant Q. serrata were so cocolonized. Overall, this study revealed that root-associated fungal communities of oak-dominated temperate forests were dominated not only by ectomycorrhizal fungi but also by diverse root endophytes and that potential ecological interactions between the two ecotypes may be important to understand the complex assembly processes of belowground fungal communities.

show abstract

Colonization patterns in a mycorrhiza‐defective mutant tomato vary with different arbuscular‐mycorrhizal fungi

Cited by 79 publications

References 32 publications

Functional aspects of root architecture and mycorrhizal inoculation with respect to nutrient uptake capacity

Functional aspects of root architecture and mycorrhizal inoculation with respect to nutrient uptake capacity

Interactions between arbuscular mycorrhizal fungi and a mycorrhiza‐defective mutant tomato: does a noninfective fungus alter the ability of an infective fungus to colonise the roots – and vice versa?

Community composition of root‐associated fungi in a Quercus‐dominated temperate forest: “codominance” of mycorrhizal and root‐endophytic fungi

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