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RASTI SARASWATI
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Medicine & Pharmacology Veterinary

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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.
ENZYME ACTIVITY IN RELATION TO TOTAL K, Ca, Mg, Fe, Cu AND Zn IN THE OIL PALM RHIZOSPHERE OF RIAU’S PEATLANDS, INDONESIA Mimien Harianti; Atang Sutandi; Rasti Saraswati; Maswar Maswar; Supiandi Sabiham
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 25 No. 3 (2018)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2018.25.3.862

Abstract

Enzyme activity can be used as a peat decomposition indicator in the oil palm rhizosphere of peatlands. Oil palm plantation management requires fertilization in the rhizosphere to provide nutrients for oil palm growth. The state of total nutrient in the rhizosphere can influence enzyme activity. This research aimed to study enzyme activity in relationship to nutrients in the oil palm rhizosphere of peatlands. Using the explorative method in Riau’s tropical peatlands, an oil palm plantation was chosen as a location for the main sites, and a degraded forest as well as a shrubland were chosen as comparison sites. In the oil palm plantation, peat samples were taken from peats adhering to oil palm roots at the peat depths of 0‒25 and 25‒50 cm and at distances of 0‒1, 1‒2, 2‒3, and 3‒4 m from the trees. In the degraded forest and shrub, t samples were taken from selected plant roots at the depths of 0-25 and 25-50 cm. The triplicate peat samples were then composited for an analysis of enzyme activity and total nutrient content. Results showed that enzyme (urease, phosphatase, β-glucosidase, and laccase) activity in the oil palm rhizosphere decreased as the distance from trees and the depth of rhizosphere increased. The decline in enzyme activity was caused by a low peat pH and an increased water content as well as organic carbon content. Enzyme activity increased with increasing oil palm age and ash content. Total K and Zn contents showed no correlation with enzyme activities. However, total Ca and Mg contents showed positive correlation only with β-glucosidase activity. Total Fe and Cu contents showed significantly negative correlation with enzyme activities (urease, phosphatase, β-glucosidase, and laccase). Enzyme activity in the rhizosphere of the degraded forest and shrubs were mostly lower than in the oil palm rhizosphere.
Co-Authors ANDO KATSUHIKO Antonius Suwanto dan Meity S. Sinaga . Budi Tjahjono Andi Khaeruni R Aris Tri Wahyudi Ariyanti Oetari Atang Sutandi Atit Kanti CHIHARU NAKASHIMA Edi Husen Maswar Maswar Mimien Harianti Wellyzar Sjamsuridzal Yantyati Widyastuti