Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Egypte → Studies on Biological Activities of Trichoderma

Minia University (1992)

Studies on Biological Activities of Trichoderma

Mohamed, Manal Mohamed Yaser.

Titre : Studies on Biological Activities of Trichoderma

Auteur : Mohamed, Manal Mohamed Yaser.

Etablissement de soutenance : Minia University

Grade : Doctor of Philosophy in botany 1999

Résumé partiel
Due to the potential importance of Trichoderma spp. as an effective antagonist to certain pathogenic fungi in soil, . as well as the difficulties encOlmtered with studying the distribution of these fimgi coupled with the lack of enough information regarding these fimgi in the Egyptian soils, the experiments presented in this thesis were designed to obtain information regarding the following aspects 1- Evaluation of different media for isolation and enumerating Trichoderma from soil 2- Occurrence and distribution of Trichoderma spp. in Egyptian soil 3- Seasonal occurrence of these fimgi in soil 4- Factors affecting survival and proliferation of these fungi in soit 5- Antagonistic effect of Trichoderma isolates against some soil fungal pathogens 6- Effect of fmnigation with allyl alcohol on Trichoderma growth and on its antagonistic activities against some other nmgi. Results of the experiments to evaluate several conventional media for isolation and enumeration of Trichoderma from soil indicated that TMB medimn (Trichoderma medimn E) and Martin’s medium containing PCNB (pentachloronitrobenzene) 100 ug/ml were the most favourable. These two media facilitated isolation and enumeration of Trichoderma by restricting the colony size of Trichoderma and limiting the f,’Towth of rapidly spreading fungi. U sing these two media for studying the distribution of Trichoderma III Egyptian soil samples collected from different governorates and habitats, indicated that Trichoderma species were mainly present in cultivated soils containing organic matter and low content of total soluble salts. Trichoderma was missed in hot desert soils and soils of salt marshes. Trichoderma isolated was mainly represented by ; T. harzianum, T. pseudokoningii, T. longibractum and T. inhamatum with the first species being the most prevalent followed by the second, whereas the third and fourth species were rare. Studies on the seasonality of OCClUTence of Trichoderma in Egyptian soil over two years period from Jlme, 1995 - May, 1997, indicated that Trichoderma flourish during the autumn and spring months and decline during the hot summer months.

Présentation étendue (EULC)

Page publiée le 15 décembre 2020