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All Journal Jurnal Biologi Tropis
Irwan Lovadi
Universitas Tanjungpura
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Growth of Maize (Zea mays L.) Under Cadmium Sulfate (CdSO4) Heavy Metal Stress Mukarlina Mukarlina; Irwan Lovadi; Widdiya Ariyani
Jurnal Biologi Tropis Vol. 26 No. 1 (2026): Januari-Maret
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.v26i1.11461

Abstract

Cadmium (Cd) is a heavy metal soil pollutant that can be toxic to plants. This study investigated the response of maize (Zea mays L.) grown in peat soil exposed to different levels of Cd stress. Four concentrations of CdSO₄ (0, 20, 40, and 60 ppm) were applied using a completely randomized design with three replications. Growth performance was evaluated through plant height, leaf production, and fresh biomass, while Cd accumulation in plant tissues was determined using Atomic Absorption Spectrophotometry (AAS). The results showed that the application of heavy metal cadmium sulfate (CdSO4) in the planting media up to 60 ppm did not affect the plant height, number of leaves and wet weight of maize. Maize showed tolerance to cadmium stress, as the application of CdSO₄ up to 60 ppm. Cadmium was detected in both roots and shoots, with greater accumulation occurring in the roots. This pattern suggests that maize restricted Cd movement to aerial tissues, which may contribute to its tolerance under Cd exposure. The findings indicate that maize can maintain normal vegetative growth under moderate Cd stress in peat soil. Further research is needed to assess long-term effects and cadmium accumulation in plant tissues.
Begonia Inventory Along the Rantau Malam Hiking Trail, TNBBBR, Indonesia Siska Debora; Irwan Lovadi; Dwi Gusmalawati
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.v26i3.12444

Abstract

Begonia is a herbaceous plant that grows in tropical rainforests from lowland and highland areas. Until now, exploration of Begonia in West Kalimantan is mostly done in lowland areas. Data on Begonia spread in highland areas in West Kalimantan are still limited. The study aims to investigate Begonia types, morphological characteristics, and habitats. The hiking track of the Rantau Malam Resort in Bukit Baka Bukit Raya National Park, Sintang Regency, was the site of this study. The cruising method was used for sampling. The results showed that there were five types of Begonia, namely B. lailana Kiew & Geri, B. mariaensis Rimi & Simun, B. paoana Kiew & S. Julia, B. danumensis F.Y Chong and B. bawangensis Houghes. Four of the five Begonia types grow on soil, while one grows on rocks. Begonia mariaensis is a new record for Indonesia.
Co-Authors Dwi Gusmalawati Mukarlina Mukarlina Siska Debora Widdiya Ariyani