Effect of biocontrol strains of Trichoderma on plant growth, Pythium ultimum populations, soil microbial communities and soil enzyme activities

Abstract

Five strains of Trichoderma with known biocontrol activities were assessed for their effect upon pea growth and their antagonistic activity against large Pythium ultimum inocula. The effect of Trichoderma inocula upon the indigenous soil microflora and soil enzyme activities in the presence and absence of Pythium is assessed. In the absence of Pythium, Trichoderma strain N47 significantly increased the wet shoot weight by 15% but did not significantly affect the dry weight, whilst strains T4 and N47 significantly increased the root weights by 22% and 8% respectively. Strains TH1 and N47 resulted in significantly greater root lengths. Pythium inoculation significantly reduced the root length and the number of lateral roots and nodules, and significantly increased the root and rhizosphere soil fungal populations. Pythium inoculation significantly reduced the plant wet and dry shoot weights and significantly increased the wet and the dry shoot/root ratio. All the Trichoderma strains reduced the number of lesions caused by Pythium and increased the number of lateral roots. The effect of the Pythium on emergence and shoot growth was significantly reduced by all the Trichoderma strains except strain To10. Inoculation with Trichoderma strains TH1 and T4 resulted in significantly greater wet root weights (62% and 57%, respectively) in the presence of Pythium compared to the Pythium control. Strain N47 significantly increased the shoot/root ratio compared to the Pythium control. Inoculation with Trichoderma strains T4, T12 and N47 significantly reduced Pythium populations. Pythium increased the activity of C, N and P cycle enzymes, whilst four Trichoderma strains reduced this effect, indicating reduced plant damage and C leakage. Overall, strains T4 and N47 had the greatest beneficial characteristics, as both these strains improved plant growth in the absence of Pythium and reduced plant damage in the presence of Pythium. The dual properties of these strains improve the commercial application, giving them an advantage over single action inocula, especially in the absence of plant pathogens.

Various Shallot Seed Treatments with Trichoderma to Increase Growth and Yield on Sandy Coastal

“…Another benefit that could be given to plants, such as IAA hormone produced by Trichoderma to spur the development of plant roots (Harman, 2000). This was in line with research done by Naseby et al (2000), which showed that Trichoderma could increase root weight and dry weight of bean plants, compared with no Trichodema.…”

“…Remarks: The numbers in the columns and / or rows followed by the same letter were not significantly different according to Duncan Multiple with α = 5%; (+): there was interaction between factors tested; Data was transformed with a log x. was done to facilitate the formation of seeds (Elias, 2006). Response of plant growth caused by Trichoderma depends on their ability to survive and thrive in root zone (Naseby et al, 2000). It could give a great influence on roots formation and yield (Harris et al, 2000).…”

Trichoderma gamsii affected herbivore feeding behaviour on Arabidopsis thaliana by modifying the leaf metabolome and phytohormones

“…have beneficial effects on plants. For instance, there are commercial agricultural products containing T. atroviride, T. harzianum and T. hamatum (Ha, 2010) that promote plant growth (Chang et al ., 1986; Gravel et al ., 2007; Contreras‐Cornejo et al ., 2009), reduce the severity of plant diseases (Naseby et al ., 2000; Nawrocka and Malolepsza, 2013) and enhance tolerance to abiotic stresses (Bae et al ., 2009; Montero‐Barrientos et al ., 2010; Dixit et al ., 2011; Contreras‐Cornejo et al ., 2014). In addition, Trichoderma sp.…”

Trichoderma spp no biocontrole de cylindrocladium candelabrum em mudas de eucalyptus saligna

“…em manchas-foliares, pode-se citar o controle de Pythium sp. (NASEBY et al, 2000) e de Cilindrocladium spathulatum em erva-mate (GOMES et al, 2001 Um disco de 5 mm de diâmetro da cultura pura do patógeno foi retirado do centro da placa e transferido para uma placa contendo apenas BDA. Após 48 h, um disco do isolado de Trichoderma spp.…”