4. Discussion
Actinomycetes are abundant producers of many bioactive
metabolites. Several studies have reported the use of endophytic
actinomycete strains for plant growth promotion and biocontrol of
plant pathogens (Conn et al., 2008; Lin et al., 2012; Goudjal et al.,
2013, 2014). In this study, a culture-dependent approach was used
to isolate the actinobacterial community present in the roots,
stems, leaves and seeds of J. curcas L. grown in dry-hot soil
conditions. It should be mentioned that in our study the plant
tissues used for isolation were surface disinfested, and no colonies
were present on the control medium agar, therefore eliminating
possible contamination from plant surface bacteria. However,
strictly speaking, the unequivocal microscopic and GFP-tagged