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Aluh Nikmatullah
Universitas Mataram
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Nursing Public Health Social Sciences Other

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Effects of Salinity and Concentration of ACC-deaminase PGPR from Bidara Root on Chili Growth and Yield Baiq Safinatun Naja; Aluh Nikmatullah; Ni Made Laksmi Ernawati
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12627

Abstract

Soil salinity is an escalating challenge in dryland agriculture, where rising electrical conductivity disrupts water balance and nutrient uptake. These stresses stimulate excessive ethylene production, which suppresses root growth and reduces overall plant vigor. Plant growth–promoting rhizobacteria (PGPR) with ACC deaminase activity offer a promising mitigation strategy by degrading ACC, the ethylene precursor, thereby helping plants maintain growth under saline conditions. This study evaluated the effect of different concentrations of ACC deaminase producing bacteria isolated from Bidara (Ziziphus mauritiana Lam.) roots on chili (Capsicum annum L.) growth under graded salinity stress. Bacterial cultures were harvested at OD₆₀₀ = 0.8 and applied at three concentrations (0, 10, and 20 mL/L) to chili seedlings exposed to four salinity levels (0, 2, 4, and 8 dS/m). Growth parameters—including plant height, leaf number, biomass, and root development—were measured to assess physiological responses. Results showed that increasing salinity progressively reduced plant growth, with substantial inhibition observed at 8 dS/m. In contrast, bacterial application significantly improved plant performance across all salinity levels, and the 20 mL/L concentration consistently produced the greatest enhancement. The improved growth is attributed to enhanced root system function and chlorophyl concentration. These findings highlight the essential role of ACC deaminase producing bacteria in mitigating salinity stress in chili cultivation under dryland conditions and underscore the importance of optimizing bacterial concentration to maximize their beneficial effects.
Development of Dust Flea Leaf Sucking Pests (Bemisia Tabaci) and The Incidence of Viral Diseases in Sweet Potato Plants in Two Agroecosystems Firda Widya Sari; M. Sarjan; Aluh Nikmatullah
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12851

Abstract

Whitefly pests (Bemisia tabaci) are leaf-sucking pests that act as vectors for the spread of viral diseases in sweet potato plants. Differences in agroecosystem conditions are suspected to affect pest populations and the development of viral diseases. This study aims to (1) identify and compare whitefly pest populations on sweet potato plants in two agroecosystems, (2) identify and compare viral disease incidence in two agroecosystems, and (3) analyze the relationship between temperature and humidity on whitefly populations and viral disease incidence. The research was carried out in drylands and technical irrigated lands by observing whitefly populations, viral disease symptoms, percentage of disease incidence, and environmental factors such as temperature and humidity. The data were analyzed using a t-test at a real level of 5% and simple linear regression. The results showed that whitefly populations and the percentage of viral disease incidence differed significantly between the two agroecosystems, with higher values on drylands than on technical irrigated land. In dry land, diseases caused by Sweet potato chlorotic stunt virus (SPCSV) and Sweet potato feathery mottle virus (SPFMV) were found, while in technical irrigation land diseases were found caused by Sweet potato virus disease (SPVD). Regression analysis showed that temperature was positively correlated, while humidity was negatively correlated with whitefly populations and viral disease incidence, with a stronger relationship in dry land than in technical irrigated land. The results of the study show that differences in agroecosystem characteristics affect the dynamics of whitefly populations and the development of viral diseases in sweet potato plants.
Co-Authors , Kisman Agus Purbathin Hadi Agus Purbatin Hadi AIDA MUSPIAH Aprilia Eristiana Avida I. A. Baiq Safinatun Naja Baiq Yulvia Elsadewi Yuniartati Baiq Yusmi A. R. Dwi Noorma Putri Elvin A. Z. Fazila Sail Fina A. Firda Widya Sari Hayati Zakaria Herman Suheri Ida Ayu Vigi M. P. Idatul Fitri Danasari Irwan Muthahanas Jufri, Afifah Farida Jurnal Pepadu M. Hardriansyah M. Sarjan M. Taufik Fauzi Meli A. Mery Windarningsih Miana Y. A. Muhammad Sarjan Mursal Ghazali Ni Made Dini Widia Handayani Ni Made Laksmi Ernawati Niza Isfiyana Osi I. Riema Rimanda Putri RINA KURNIANINGSIH Safira N. Satrijo Saloko Siti Rosidah Sitti Latifah Sofyan T. Sri Puji Astuti Wulandari, Febriana Tri Zakiah A.