Fungal isolates of genus Trichoderma induce wilt resistance to pea caused by Fusarium oxysporum f. sp. pisi through competitive inhibition

Nawaz., Syed Mohsin; Subhani, Muhammad Nasir; Chattha, M.B.; Saleem, Yasmeen; Abidi, Syed Hani; Shahzad, Khuram; Saeed, Sadia; Syed, Quratualain; Irfan, Muhammad; Ambreen, A.

doi:10.24275/rmiq/bio2475

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“…This strategy is very well documented in several species of the genus and is considered as one of the major mechanisms involved in the antagonistic activity. The hyperparasitism of T. harzianum against F. solani by coilings formation was already reported by Kumar et al, 1998 [93] and more recently described also for T. koningii, T. viride, T. hamatum and T. asperellum with regards to several fungal pathogens and Oomycetes [94][95][96]. Coilings formation of the tested isolates in this study was evaluated by both a light and scanning electron microscope, revealing that all the selected Trichoderma isolates showed this aptitude but T. longipile SG1, which was still able to overgrow P. xcambivora in dual cultures (Figures 4 and 5).…”

Section: Discussionsupporting

confidence: 54%

Biocontrol of Phytophthora xcambivora on Castanea sativa: Selection of Local Trichoderma spp. Isolates for the Management of Ink Disease

Frascella

Sarrocco

Mello

et al. 2022

Forests

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Ink disease is a devastating disease of chestnut (Castanea sativa) worldwide, caused by Phytophthora species. The only management measures of this disease are chemical and agronomic interventions. This work focuses on the evaluation of the in vitro antagonistic capacity of 20 isolates of Trichoderma spp. selected in a diseased chestnut orchard in Tuscan Apennines (San Godenzo, Italy) for the biocontrol of Phytophthora xcambivora. Each Trichoderma isolate was tested to investigate pathogen inhibition capability by antagonism in dual cultures and antibiosis by secondary metabolites production (diffusible and Volatile Organic Compounds). The six most performing isolates of Trichoderma spp. were further assessed for their aptitude to synthesize chitinase, glucanase and cellulase, and to act as mycoparasite. All six selected isolates displayed the capability to control the pathogen in vitro by synergistically coupling antibiosis and mycoparasitism at different levels regardless of the species they belong to, but rather, in relation to specific features of the single genotypes. In particular, T. hamatum SG18 and T. koningiopsis SG6 displayed the most promising results in pathogen inhibition, thus further investigations are needed to confirm their in vivo efficacy.

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Section: Discussionsupporting

confidence: 54%