Table 1: Relative HSL-degrading activity of actinomycetes isolated from rhizospheric and endophytic samples.

LocationNo.
of isolates
Relative HSL-degrading activity* (%)
0 >0–50>50–75>75–87.5>87.5–93.8>93.8–96.9>96.9–100

Rhizospheric samples
 Bangkok278182541611843
 Chanthaburi136500110
 Nongbualumpoo32000001
 Prachinburi2712933000
 Rayong2315800000

Total344217761914954

Total (percentage)217 (63.1%)127 (36.9%)

Endophytic samples
 Bangkok43291201100
 Nakhonpathom2920810000
 Phetchabun601525010145

Total1326445111245

Total (percentage)64 (48.5%)68 (51.5%)

*The activity of each isolate was qualitatively determined by comparing with known concentrations of C10HSL (200, 100, 50, 25, 12.5, 0.625, and 0 pmole).