Effect of Trichoderma Colonization on Auxin-Mediated Regulation of Root Elongation

Björkman, Thomas

doi:10.1023/b:grow.0000038260.85276.82

Cited by 24 publications

(16 citation statements)

References 19 publications

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“…Some species of trichoderma can produce auxininducing compounds, however, the high production of this phytohormone in the rhizosphere may reduce the development of the root system (Vinale et al, 2008a,b). According to Bjorkman (2004), growth rates of corn roots with high sensitivity to IAA can be reduced with addition of these phytohormones, whereas the addition of exogenous IAA in corn roots with low sensitivity to this phytohormone may result in higher growth rate.…”

Section: Resultsmentioning

confidence: 99%

Initial development of lettuce in vermicompost at higher trichoderma doses

et al. 2018

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The study aimed to evaluate the initial development, as well as, the chemical characteristics of lettuce plants grown in substrate with high concentrations of bioagent (trichoderma). A completely randomized design with four replicates was used. The treatments, applied to a substrate composed of a blend of vermicompost and commercial substrate, were established by the following doses of the commercial product ICB Nutrissolo Trichoderma: T1) 0.0; T2) 1.0; T3) 2.0; T4) 4.0; T5) 8.0 and T6) 16.0x1011 conidia kg -1 of product. After inoculation, the substrate was placed in trays, where 50 lettuce seeds were sown on each replication. Plants were thinned after emergency stabilization, maintaining ten seedlings per tray. At 28 days after sowing, the characteristics percentage and emergence speed index, leaf area, fresh and dry leaf biomass, volume, length and surface area of the root were evaluated. We also determined the chemical characteristics of the leaves. The percentage of seed germination and the emergence speed index were lower at doses higher than 4.0x10 11 conidia kg -1 of the biological product. All the studied doses influenced negatively in shoot and root development of the plants. The percentage of nutrients in the leaves was higher in treatments with ICB.

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Section: Resultsmentioning

confidence: 99%

Initial development of lettuce in vermicompost at higher trichoderma doses

et al. 2018

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“…are well-known for their capacity to improve plant growth and promote health in agricultural systems (Harman et al, 2004 ; Gravel et al, 2007 ; Bae et al, 2009 ). Examples of these mechanisms include: improving secretion plant stimulatory compounds, such as growth hormones (indole acetic acids, cytokinins, gibberellins, and zeatins; Gravel et al, 2007 ; Contreras-Cornejo et at., 2009 ), enhancing solubilization of soil nutrients (Yedidia et al, 2001 ; Kapri and Tewari, 2010 ), increasing root length and number of root hairs to absorb nutrients by exploring larger spaces of soil (Bjorkman, 2004 ; Samolski et al, 2012 ). The life cycle, ecology, and evolution of Archaeorhizomycetes remain largely unknown.…”

Section: Discussionmentioning

confidence: 99%

Trichoderma Biofertilizer Links to Altered Soil Chemistry, Altered Microbial Communities, and Improved Grassland Biomass

et al. 2018

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In grasslands, forage and livestock production results in soil nutrient deficits as grasslands typically receive no nutrient inputs, leading to a loss of grassland biomass. The application of mature compost has been shown to effectively increase grassland nutrient availability. However, research on fertilization regime influence and potential microbial ecological regulation mechanisms are rarely conducted in grassland soil. We conducted a two-year experiment in meadow steppe grasslands, focusing on above- and belowground consequences of organic or Trichoderma biofertilizer applications and potential soil microbial ecological mechanisms underlying soil chemistry and microbial community responses. Grassland biomass significantly (p = 0.019) increased following amendment with 9,000 kg ha−1 of Trichoderma biofertilizer (composted cattle manure + inoculum) compared with other assessed organic or biofertilizer rates, except for BOF3000 (fertilized with 3,000 kg ha−1 biofertilizer). This rate of Trichoderma biofertilizer treatment increased soil antifungal compounds that may suppress pathogenic fungi, potentially partially responsible for improved grassland biomass. Nonmetric multidimensional scaling (NMDS) revealed soil chemistry and fungal communities were all separated by different fertilization regime. Trichoderma biofertilizer (9,000 kg ha−1) increased relative abundances of Archaeorhizomyces and Trichoderma while decreasing Ophiosphaerella. Trichoderma can improve grassland biomass, while Ophiosphaerella has the opposite effect as it may secrete metabolites causing grass necrosis. Correlations between soil properties and microbial genera showed plant-available phosphorus may influence grassland biomass by increasing Archaeorhizomyces and Trichoderma while reducing Ophiosphaerella. According to our structural equation modeling (SEM), Trichoderma abundance was the primary contributor to aboveground grassland biomass. Our results suggest Trichoderma biofertilizer could be an important tool for management of soils and ultimately grassland plant biomass.

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“…The mechanisms employed by Trichoderma species to affect disease control includes mycoparasitism and antibiotic (toxin) production, competition through rhizosphere competence, production of enzymes such as chitinases and glucanases responsible for the suppression of plant pathogen by destroying cell wall integrity, induction of defense response in plant such as peroxidase activity (Harman 2000, Harman et al 2008, Howell 2003. The biological seed treatments have been reported as an effective seed protection method in sweet corn using Trichoderma (Bjorkman et al 1998, Bjorkman 2004, Harman et al 1989, Parera & Cantliffe 1990), Pseudomonas (Callan et al 1990, Cantliffe & Bieniek 1988, Mathre et al 1995, Gliocladium (Hartz & Caprile 1995).…”

Section: Biological Seed Treatments and Seed Primingmentioning

confidence: 99%

Enhanced Sweet Corn Propagation: Studies on Transplanting Feasibility and Seed Priming

El-Hamed¹,

Elwan²,

Shaban³

2011

Journal of Fruit and Ornamental Plant Research

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Enhanced Sweet Corn Propagation: Studies on Transplanting Feasibility and Seed PrimingSweet corn hybrids with high-sugar genotypes (sh2) has inherent problem of low seed emergence and stand in the field. This study was conducted to determine the effect of seed size, tray cell size and growing media components on sweet corn transplant transplanting. Other objectives were to evaluate the effect of priming sweet corn seeds on germination in the field. Bio-priming withTrichodermaandBacillus, osmopriming with KNO3, and hydro-priming with H2O have been tested. The results indicated that transplanting sweet corn is feasible with high quality transplants from seeds that germinate well in disease-free environment. Large sweet corn seeds, large tray cells, and vermiculite-based growing media proved to gave higher germination percentages. While same factors did not show pronounced effect on seedling performance in terms of root and shoot length and fresh weight. In the priming experiment, the bio-priming treatment showed the highest germination of seeds percentage among other priming treatments and the control. Sweet corn seeds treated withBacillus megateriumgerminated 50% higher than seeds treated withTrichodermaspp. as bio-control agents.Aspergillus niger, andPenicilliumrepresented 65% of pathogens responsible for failure of sweet corn seed germination. The results of this study demonstrated the feasibility of enhanced sweet corn seed propagation through transplanting and seed priming to improve emergence and field stand.

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Effect of Trichoderma Colonization on Auxin-Mediated Regulation of Root Elongation

Cited by 24 publications

References 19 publications

Initial development of lettuce in vermicompost at higher trichoderma doses

Initial development of lettuce in vermicompost at higher trichoderma doses

Trichoderma Biofertilizer Links to Altered Soil Chemistry, Altered Microbial Communities, and Improved Grassland Biomass

Enhanced Sweet Corn Propagation: Studies on Transplanting Feasibility and Seed Priming

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