Streptomyces rochei ACTA1551, an Indigenous Greek Isolate Studied as a Potential Biocontrol Agent against Fusarium oxysporum f.sp. lycopersici

Table 1

Streptomyces strains with antifungal activity originated from twelve studied Greek habitats.

Sampling area	Number of isolates tested	Number (percentage) of isolates with antifungal activity against F. oxysporum DSM62059 {highest;lowest;average}^1
(A) Rhizosphere samples
(1) Rhizosphere of Ebenus sibthorpii	28	3 (10.7%) {2.36;1.3;1.5}
(2) Rhizosphere of Ceratonia siliqua	42	1 (2.4%) {1.96;1.96;1.96}
(3) Rhizosphere of Olea europea	73	6 (8.2%) {2.57;2.13;1.34}
(4) Rhizosphere of Pinus brutia from Crete	20	3 (15.0%) {4.84;3.26;1.56}
(5) Rhizosphere of evergreen woody shrubs from an island of the Aegean Sea	21	5 (23.8%) {2.69;1.87;1.47}
(6) Rhizosphere of evergreen woody shrubs from an island of the Ionian Sea	28	0 (0.0%)
(7) Rhizosphere of coniferous trees (Arcadian forest)	84	6 (7.1%) {2.91;2.05;1.56}
Rhizosphere subtotals	296	21 (7.0%)
(B) Nonrhizosphere samples
(8) Hot spring water of Thermopiles thermal springs (Viotia district)	22	2 (9.1%) {1.63;1.46;1.28}
(9) Sediment from a volcanic area (Santorini island—Aegean sea)	5	1 (20%) {1.3;1.3;1.3}
(10) Soil derived from cultivated area (Marathon, Attica district)	179	10 (5.6%) {2.25;1.6;1.25}
(11) Soil from protected natural forest area (Kessariani, Attica District)	26	2 (7.7%) {1.39;1.37;1.34}
Nonrhizosphere subtotals	232	15 (6.0%)
Total	528	39 (7.0%)

1Antagonistic activity levels as expressed by the quotient of the inhibition zone area over streptomycete colony area (See Section 2.2).