Table 2.
Influence of NH4+ in the root environment on the release of BNI activity and brachialactone from roots of Brachiaria humidicola grown with NH4+ as the N source
| Exudate-collection solution | BNI activity released from the roots, ATU per g root dry wt per day | Brachialactone released from the roots, μg per g root dry wt per day |
|---|---|---|
| Distilled water | 6.6 ± 1.2 | 1.3 ± 0.1 |
| Acidified water (pH 3.0) | 4.8 ± 0.4 | 1.6 ± 0.6 |
| KNO3 (1 mM) | ND | ND |
| NH4Cl (1 mM) | 13.9 ± 1.6 | 8.3 ± 0.2 |
All collection solutions contained 200 μM CaCl2. Values are means ± SE from three replications. ND, not detected.