Arbuscular mycorrhizal fungal spore-associated bacteria affect mycorrhizal colonization, plant growth and potato pathogens

Bharadwaj, Dharam Parkash; Lundquist, Per-Olof; Alström, Sadhna

doi:10.1016/j.soilbio.2008.06.012

Cited by 84 publications

(55 citation statements)

References 37 publications

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“…This AMF species was also shown to associate with some PGPR such as Pseudomonas and Bacillus. These bacteria living on or inside the AMF spore wall are beneficial to plants 39 . Such PGPR are responsible for the decomposition of both inactive and active soil organic matter 40 .…”

Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungus improves the yield and quality of Lactuca sativa in an organic farming system

Charoonnart¹,

Seraypheap²,

Chadchawan³

et al. 2016

ScienceAsia

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Arbuscular mycorrhizal fungi have been reported to enhance the growth of many crop plants. This study examines the effect of Funneliformis mosseae, a type of arbuscular mycorrhizal fungus (AMF), on the growth of butterhead lettuce in organic cultivation. Lettuces were inoculated with 50 spores of F. mosseae to determine their physiological and biochemical characters compared to uninoculated lettuces in an abandoned field. After 60 days of growth, the AMF-inoculated plants had significantly more leaves (on average, 19.4) and greater leaf fresh weight (on average, 30.4 g) than for the no-AMF treatment which had 15.8 leaves with a total weight of 14.5 g. Net photosynthesis and the chlorophyll a content were higher in the AMF-inoculated plants than in the control plants. The rhizosphere soil of 60-day-old AMF-inoculated butterhead lettuce showed higher organic matter, available phosphorus content, and exchangeable potassium content. The plants in the AMF treatment showed higher total nitrogen, phosphorus, and potassium contents in leaf and root tissues than the control plants. Antioxidant capacity was analysed by quantifying catalase and ascorbate peroxidase activities, ascorbic acid content, and carotenoid content. All of these parameters tended to be higher in the AMF treatment than in the control. The diphenylpicrylhydrazyl radical scavenging activity in AMF-inoculated plants (54%) was twice that in the control plants (24%). These results demonstrate that applying AMF is a cost-effective way to enhance the growth of organically farmed butterhead lettuce.

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Section: Discussionmentioning

confidence: 99%

Arbuscular mycorrhizal fungus improves the yield and quality of Lactuca sativa in an organic farming system

Charoonnart¹,

Seraypheap²,

Chadchawan³

et al. 2016

ScienceAsia

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“…Attempts to identify rhizobacteria from AM structures led to the isolates showing strong antagonism toward various soilborne pathogens (Bharadwaj et al 2008;Lioussanne 2010). Linderman (2008) also demonstrated that the rhizobacteria along with AM fungi can enhance plant growth and increase antagonism toward soil-borne pathogens.…”

Section: Discussionmentioning

confidence: 99%

Declined soil suppressiveness to Fusarium oxysporum by rhizosphere microflora of cotton in soil sickness

Zhang

Ding

et al. 2015

Biol Fertil Soils

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Cotton yield and quality have been severely compromised by soil sickness throughout the primary cottongrowing regions of China. The aim of this study was to gain insight into the role of rhizosphere microbial community in governing soil sickness of cotton. Plant growth, disease resistance, root exudates, and the composition of the rhizosphere microbial community of cotton were analyzed in two different (4-and 15-year) monocropped soils and in a fallow agricultural soil (control). The monocropped soils significantly influenced cotton growth and root exudates and reduced soil suppressiveness to Fusarium wilt in bioassay experiments. Additionally, pyrosequencing of the whole internal transcribed spacers (ITS1 and ITS2) and 16S rRNA gene amplicons demonstrated clear variations in the microbial composition of cotton rhizosphere between monocropped rhizosphere soils and control soil. Specifically, monocropped soils were characterized by an increase in the abundance of fungal pathogens, including Fusarium oxysporum f. sp. vasinfectum and Verticillium dahliae, relative to the rhizosphere of control soil. Some plant-beneficial and disease-suppressive bacterial taxa, including Xanthomonadaceae, Comamonadaceae, Oxalobacteraceae, and Opitutaceae, were associated with healthy cotton. A significant correlation existed between the presence of certain amino acids (e.g., glutamic acid and alanine) and the above identified taxa, indicating that some constituents in root exudates influenced the microbial compositions of the cotton rhizosphere to manage the disease status of plant in monocropped soils. Collectively, these results suggest that pathogenic fungal build-up and a reduction in the abundance of beneficial rhizobacteria in the rhizosphere contribute to changes in soil suppressiveness to soil-borne pathogens in monocropped soils, resulting in an aggravated level of soil sickness.

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“…Some biological control agents can act directly against fungal pathogens by enzymatic degradation of their cell walls (Kamensky et al 2002;Li et al 2002), by parasitism-as it seems to be the case against numerous nematodes-(Nunez-Camargo et al. 2003;Papert et al 2004), by antibiotics production (Grosch et al 2005), by siderophore secretion that reduces the availability of iron needed by plant pathogens (Bharadwaj et al 2008) or by interfering with communication between pathogens, i.e., by degrading molecules involved in the "quorum sensing" mechanisms of Pectobacterium spp. (Dong et al 2004).…”

Section: Interactions Between Microorganisms Organisms and Pathogensmentioning

confidence: 99%

Potato soil-borne diseases. A review

Fiers¹,

Edel-Hermann²,

Chatot³

et al. 2011

Agron. Sustain. Dev.

137

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Potato crop is the fourth main food crop in the world and it will certainly feed a big part of the global population in the next years. The economical outlets for this crop are great; however, numerous diseases either soil-or airborne can cause huge losses in the production. Worldwide, about 40 soil-borne diseases affect potato and cause severe damages especially on tubers, the economically most important part of the plant. The occurrence and development of soilborne diseases depend on very diverse factors affecting either the pathogen or the plant. Favorable conditions for potato diseases development are frequently the same as the conditions needed for potato growth: temperature between 10°C and 25°C, high humidity, medium pH, etc. Adapted cultural practices such as a rotation longer than 4 years, appropriate fertilization and water management, an adapted delay between haulm killing and harvest, and dry and cool conditions for tuber storage are good ways to control potato diseases. In most cases, potato pathogens develop specific survival forms, dissemination ways and host penetration methods. The genetic variability of the pathogens implies the use of adapted diagnostic and control methods. Decision support systems developed to predict yield losses allow choosing good control methods such as the use of healthy seeds, adapted pesticides, cultural practices, and biological control agents for each potato disease. The complexity of the interactions between a pathogen and its host, influenced by biotic and abiotic factors of the environment, make the control of the diseases often very difficult. However, deep knowledge of pathosystems allows setting up integrated pest management systems allowing the production of healthy and good quality potatoes.

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Arbuscular mycorrhizal fungal spore-associated bacteria affect mycorrhizal colonization, plant growth and potato pathogens

Cited by 84 publications

References 37 publications

Arbuscular mycorrhizal fungus improves the yield and quality of Lactuca sativa in an organic farming system

Arbuscular mycorrhizal fungus improves the yield and quality of Lactuca sativa in an organic farming system

Declined soil suppressiveness to Fusarium oxysporum by rhizosphere microflora of cotton in soil sickness

Potato soil-borne diseases. A review

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