A total of 202 Trichoderma isolates was obtained as described in the subsection Fungal Isolates of Materials and Methods. The recovered species comprised Trichoderma harzianum Rifai, T. virens (Miller, Giddens & Foster) von Arx, T. atroviride P. Karst, T. hamatum (Bonord.) Bainier, T. brevicompactum Kraus, Kubicek & Gams and T. asperellum Samuels, Lieckf. & Nirenberg (Table 1). One hundred and sixteen isolates belonged to the T. harzianum species complex, 70 were identified as T. virens and 11 as T. atroviride. Three isolates of T. hamatum, one of T. asperellum and one of T. brevicompactum were also obtained. T. harzianum proved to be the dominant Trichoderma species in rice phyllosphere, while T. virens was more abundant in the soil than in the phyllosphere. None of the representatives of the four remaining species were isolated from phyllosphere (Figure 2). In addition, all the T. atroviride isolates except one originated in the eastern part of Mazandaran province. More species were isolated from the soil than from the phyllosphere; from the phyllosphere only T. harzianum (31 isolates) and T. virens (three isolates) were recovered. The Trichoderma spp. ranged from 0.5×102 to 1×103 cfu g-1 of dry soil in paddy rice fields.
Figure
A total of 202 Trichoderma isolates was obtained as described in the subsection Fungal Isolates of Materials and Methods. The recovered species comprised Trichoderma harzianum Rifai, T. virens (Miller, Giddens & Foster) von Arx, T. atroviride P. Karst, T. hamatum (Bonord.) Bainier, T. brevicompactum Kraus, Kubicek & Gams and T. asperellum Samuels, Lieckf. & Nirenberg (Table 1). One hundred and sixteen isolates belonged to the T. harzianum species complex, 70 were identified as T. virens and 11 as T. atroviride. Three isolates of T. hamatum, one of T. asperellum and one of T. brevicompactum were also obtained. T. harzianum proved to be the dominant Trichoderma species in rice phyllosphere, while T. virens was more abundant in the soil than in the phyllosphere. None of the representatives of the four remaining species were isolated from phyllosphere (Figure 2). In addition, all the T. atroviride isolates except one originated in the eastern part of Mazandaran province. More species were isolated from the soil than from the phyllosphere; from the phyllosphere only T. harzianum (31 isolates) and T. virens (three isolates) were recovered. The Trichoderma spp. ranged from 0.5×102 to 1×103 cfu g-1 of dry soil in paddy rice fields.Figure
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