#gram-negative

Due to the increasing resistance of pathogenic microorganisms, Aspergillus sp. isolated from Aglibut Sweet Tamarind’s bark of Pampanga State Agricultural University was evaluated for potential mycoparasitism and antimicrobial activity. The micrograph obtained from Scanning Electron Microscopy (SEM) Analysis reveals that Aspergillus sp. is a potential mycoparasite; further, its identity was 99% which was confirmed through 18s rDNA of its ITS1 forward and ITS4 reverse sequences by Polymerase Chain Reaction (PCR) Amplification and Sequencing. Moreover, Thin-layer Chromatography (TLC) was used to identify the bioactive compounds of Aspergillus sp. The chemical groups such as Glycosidic flavonoid, Alkaloid and Anthrones were also present which can express the desired activity. Complete Randomized Design (CRD) was carried out with the following treatments; T1 (suspensions), – control (DMSO) and + control (streptomycin for bacteria: ketoconazole for fungus). Paper-disc Diffusion confirms that the suspensions of Aspergillus sp. have significant antimicrobial potential as shown in the zones of inhibition in S. aureus and S. cerevisiae but with lower activity in E. coli. Thus, Aspergillus sp. is a potential mycoparasite and source of new drugs and drug products.

Rangpur citrus group was tested during the present study for the identification of tolerance against huanglongbing. Control of huanglongbing (HLB) disease is necessary around the world to avoid the complete destruction of citrus. Rangpur accessions were graft challenged with huanglongbing positive budwood to study the resistance and symptom expression. Vein yellowing symptoms appeared on Rangpur poona nucellar and tuningmeng nucellar while vein yellowing and blotchy mottle symptoms appeared only on tuningmeng nucellar. Kirumakki nucellar and knorr nucellar expressed no symptoms. Being a drought-tolerant rootstock with less HLB symptom expression, Rangpur rootstock cultivars especially kirumakki nucellar and knorr nucellar may be used to test the production and survival of plant with compatible scion varieties.