The research was conducted in the field of Taro village Gianyar regency and Katung village Bangli regency and at the Laboratory of Biotechnology Faculty of Agricultural Udayana University. The purpose of the research were to investigate population dynamic of Diaphorina citri Kuwayama and other insects that were assosiated with citrus cv. siam; and molecular detection of CVPD patogen in its vector, other phytophagous insects on citrus cv.siam and kemuning [Murraya paniculata (L.) Jack.] The result of this study showed that in six month period there was one peak of D. citri population which was associated with the flushing period of citrus at Taro as well Katung villages. The peak of D. citri population of Taro village was higher than that of Katung village. Two species of parasitoids and four spesies of predators were found in the field and may contribute in the suppression of D. citri population. The parasitoids identified were Tamarixia radiata Wat. and Diaphorencyrtus alligharensi Shaffe, whereas the predators were Curinus coeruleus Mulsant, Phiddipus sp., Menochilus sexmaculatus Fabricius and Oxyopes javanus Thorell. T. radiata has been proven to be an effective nymph parasitoid that could suppress the population development of D. citri in citrus orchads. The research revealed that kemuning could serve as a source of infection because it is also a host of CVPD disease as well as of D. citri. Toxoptera citricidus Kirkaldy and Maleuterpes dentipes Hell. were not proven to contain CVPD disease.
Isolation and identification of arbuscular mycorrhizal fungi (AMF) in cashew plants was carried out in Datah Village, Abang District of Karangasem Regency. This study aims to determine the diversity of mycorrhizal spores in the cashew rhizosphere and AMF infections in the roots of cashew plants. The result in microscopic observations found 5 genera of AMF spores such as Glomus, Racocetra, Entrophospora, Septoglomus, and Acaulospora and the population of the genus Glomus were found most dominant in the rhizosphere of cashew plants. The result of staining root with trypan blue obtained the internal structure of AMF in the form of vesicles, arbuscules and hyphae found in root tissue of cashew plants. The result of AMF DNA amplification with primer NS31 and AML2 showed 560 bp bands in electrophoresis with 1% agarose gel determined AMF infection in root of cashew plants.
Citrus (Citrus nobilis L.) Propagation Through Culture In Vitro Using Seed From Infected Plants Of Citrus Vein Phloem Degeneration (CVPD) Disease. The sample was taken in Belancan Village, Kintamani District, Bangli Regency, and invitro culture was conducted in UPT. Genetics Resource and Molecular Biology Laboratory in February to June 2018. This research purposes were to get the new citrus plant from citrus seed infected of CVPD disease explants with culture in vitro and found the presence of the bacterium Liberobacter asiaticus in results of citrus plants culture in vitro. The sampling method is using plants appearance. Obtained sample 1 is a plant that shows severe symptoms of CVPD disease and sample 2 plants that show no symptoms of CVPD disease. Seed Sample is cultured with MS0 medium for 8 WAP then proceed to acclimatization. The results of this research showed that the seed explants from both samples were able to grow well and did not have the characteristic of CVPD disease, but explant seed sample 2 in vitro culture result showed that the bacterial DNA bacterium Liberobacter asiaticus pathogen CVPD disease does exist in length 1160bp, so it cannot be expected to produce CVPD-free crops.
Phenol is an organic compound that is toxic to humans and the environment. This compound was contained in the hospital liquid waste and petrochemical-based industrial sectors. This study aims to obtain hydrocarbonoclastic bacterial isolates that act as biodegradation agent in waste handling. Samples obtained from the biofilter tank of liquid waste treatment Bhayangkara Hospital Denpasar,Bali, Indonesia then carried out isolation and inoculation of bacteria in selective media NA (Nutrient Agar) containing Phenol. The bacteria obtained was performed the viability test on the media with various Phenol concentration levels, obtained three isolates of bacteria capable of growing to the concentration Phenol 500 mg / L, i.e. isolates IB2, IB5, and IB10. Therefore, it was performed the degradation ability and rate test on those three isolates. After 72 hours of incubation periods, the change of Phenol concentrations was analyzed using the folinciocalteau method and examined using the spectrophotometer with 660 nm of wavelength. Based on the analysis of final phenol content, the IB2 isolate has the highest degradation capability in the concentration of 600 mg/L (153,4 mg) with a degradation rate of 2,13 mg/h. IB5 isolates have the highest degradation capability in the concentrations of 700 mg/L (109,45 mg) with a degradation rate of 1,52 mg/h. Meanwhile, IB10 isolates show the lowest ability and degradation rate in both concentrations. Through morphological identification and Gram stain, three isolates belong to the Gram-negative rod-shaped bacteria, which has similarities with the Pseudomonas genus.
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