Table 2.
Mean values and ANOVA analysis of culturable rhizobacteria (g−1 root) associated with roots of A. vera developed on agar plates of plant-based culture media (prepared from juices of A. vera and A. arborescens diluted 1:20 and 1:40, v/v) and standard culture media (NA, nutrient agar; CCM, N-deficient combined carbon sources). Means followed by the same letter are not statistically different.
| Treatments | (Log No g−1 root) |
|---|---|
| Factor (A): time of incubation | |
| 1–3 days | 6.51B |
| 2–7 days | 7.02A |
| L.S.D. (p ⩽ 0.05) | 0.15 |
| Factor (B): root sphere | |
| 1-Free soil | 6.69B |
| 2-Endo-rhizosphere | 6.16C |
| 3-Ecto-rhizosphere | 7.44A |
| L.S.D. (p ⩽ 0.05) | 0.18 |
| Factor (C): culture media | |
| 1-NA | 7.15A |
| 2-CCM | 6.56C |
| 3-A. vera juice (diluted 1:20) | 6.74BC |
| 4-A. vera juice (diluted 1:40) | 6.63BC |
| 5-A. arbo juice (diluted 1:20) | 6.87B |
| 6-A. arbo juice (diluted 1:40) | 6.64BC |
| L.S.D. (p ⩽ 0.05) | 0.26 |
| 2-way interactions: root sphere × culture media (B × C) | |
| 1. Free soil × NA | 6.74CD |
| 2. Free soil × CCM | 6.50DEF |
| 3. Free soil × A. vera 1:20 | 6.59DE |
| 4. Free soil × A. vera 1:40 | 6.48DEF |
| 5. Free soil × A. arbo 1:20 | 7.21B |
| 6. Free soil × A. arbo 1:40 | 6.63D |
| 1. Endo-rhizosphere × NA | 6.75CD |
| 2. Endo-rhizosphere × CCM | 6.01G |
| 3. Endo-rhizosphere × A. vera 1:20 | 6.08FG |
| 4. Endo-rhizosphere × A. vera 1:40 | 5.94G |
| 5. Endo-rhizosphere × A. arbo 1:20 | 6.01G |
| 6. Endo-rhizosphere × A. arbo 1:40 | 6.16EFG |
| 1. Ecto-rhizosphere × NA | 7.95A |
| 2. Ecto -rhizosphere × CCM | 7.15BC |
| 3. Ecto -rhizosphere × A. vera 1:20 | 7.56AB |
| 4. Ecto -rhizosphere × A. vera 1:40 | 7.47B |
| 5. Ecto -rhizosphere × A. arbo 1:20 | 7.39B |
| 6. Ecto -rhizosphere × A. arbo 1:40 | 7.13BC |
| L.S.D. (p ⩽ 0.05) | 0.45 |