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All Journal Microbiology Indonesia BIOTROPIA - The Southeast Asian Journal of Tropical Biology
RASTI SARASWATI
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Medicine & Pharmacology Veterinary

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Journal : Microbiology Indonesia

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Prospective Use of 1-Aminocyclopropane-1-Carboxylate Deaminase-Producing Bacteria for Plant Growth Promotion and Defense against Biotic and Abiotic Stresses in Peat-Soil-Agriculture EDI HUSEN; ARIS TRI WAHYUDI; ANTONIUS SUWANTO; RASTI SARASWATI
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (77.904 KB) | DOI: 10.5454/mi.2.3.2

Abstract

The 1-aminocyclopropane-1-carboxylate (ACC) deaminase (EC4.1.99.4) is an enzyme produced by some soil bacteria to degrade ACC (the immediate precursor of ethylene) to reduce ethylene biosynthesis in higher plants. Increased concentrations of ethylene in plant tissues, which are triggered by various biotic and abiotic stresses, inhibits plant growth and weakens the plant defense against the stressors. Various findings on the successful use of ACC deaminase producing bacteria for plant growth under unfavorable soil conditions are inspiring their use in tropical peat-soil-agriculture, which possesses bio-physical constraints. It has been proven that inoculation of plants with ACC deaminase producing bacteria decreased ethylene inhibition generated by unfavorable environmental conditions, such as nutrient shortage, flooding, drought, high salts, and the presence of heavy metals and organic pollutants. Understanding the mechanisms by which ACC deaminase-producing bacteria act to reduce plant stress and the fitness of bacterial traits with the properties and constraints of peat-soils becomes a key to utilize these bacteria in improving crop productivity. The bacteria may ameliorate plant stress as well as promote plant growth under seasonal bio-physical changes of peat-soils that are usually encountered in the field.
Ecological and Taxonomical Perspective of Yeasts in Indonesia WELLYZAR SJAMSURIDZAL; ARIYANTI OETARI; ATIT KANTI; RASTI SARASWATI; CHIHARU NAKASHIMA; YANTYATI WIDYASTUTI; ANDO KATSUHIKO
Microbiology Indonesia Vol. 4 No. 2 (2010): August 2010
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8632.042 KB) | DOI: 10.5454/mi.4.2.3

Abstract

In the course of ecological and taxonomical study of yeasts in Indonesia, a total of 2147 yeast isolates from 315 samples in the year 2003, 2005, 2006, and 2008 had been obtained from eight locations e.g. Liwa (Sumatera), Cibinong (Java), Cibodas (Java), Kutai (Kalimantan), Enrekang (Sulawesi), Pucak (Sulawesi), Gili and Kuta (Lombok), and Kupang (Timor). Leaves, flowers, litters, soils, epiphytic soils, insects and insect's nests were collected for yeasts isolation. Our molecular identification based on D1/D2 region of nuclear large-subunit rDNA and the internal transcribed spacer (ITS) regions sequence data on 525 representative isolates revealed that 306 isolates belong to 48 described species (18 genera) and 209 strains belong to 19 undescribed species (19 genera), and 10 isolates were discarded because of contamination. Based on their substrates, litter had the highest yeasts genera (19) followed by soils (18), flowers (10), leaves (6), epiphytic soils (4), and insects and insect's nests (4). Genera found on soils were also common on litters. Yeasts genera found on flowers and epiphytic soils were common on leaves and litters. The genera Aureobasidium, Cryptococcus, Pseudozyma, Rhodotorula and Sporidiobolus were found in all substrates. Based on their locations, Kutai had the highest number of genera (15) followed by Cibodas (10), Cibinong (10), Enrekang (10), Kupang (10), Pucak (9), Liwa (7), and Lombok (7). The genus Cryptococcus was found in all locations. Our study shed a light to detection of many new taxa of yeasts, 41% of yeasts found in this study represented novel taxa.
Co-Authors ANDO KATSUHIKO Antonius Suwanto Aris Tri Wahyudi Ariyanti Oetari Atang Sutandi Atit Kanti CHIHARU NAKASHIMA Edi Husen Maswar Maswar Mimien Harianti Wellyzar Sjamsuridzal Yantyati Widyastuti