The present experiment was conducted to establish an efficient in vitro regeneration protocol for Alocasia amazonica through indirect organogenesis from young leaf segment. For callus induction, leaf explants were inoculated on MS medium containing different concentrations of 2,4-D. Highest callus induction frequency (90%) was recorded on MS medium supplemented with 4.0 mg/l 2,4-D. Remarkable results on indirect shoot organogenesis and multiplication (86.67%) with maximum shoot number per unit callus (11.64 ± 0.37) and shoot length (10.13 ± 0.24 cm) were observed when the leaf derived callus were transferred on MS medium fortified with 1.5 mg/l BAP and 0.5 mg/l NAA. Additionally, the incorporation of 10% coconut water with the medium showed satisfactory shoot growth and development. The best response towards root induction (85%) was achieved on ½ MS medium fortified with 3.0 mg/l IBA, 2.0 mg/l IAA and 2.0 mg/l NAA with an average 22.20 ± 0.87 roots per unit shoot. Well rooted plantlets were successfully acclimatized to the soil where the survival rate was 90%. Plant Tissue Cult. & Biotech. 32(1): 13-20, 2022 (June)
Micropropagation of Dracaena fragrans cv.Victoria was conducted using the young, tender and disease-free leaves and nodal segments as explants collected from the local market of Savar, Dhaka. Surface sterilization of the explants pretreated with a liquid detergent and then 0.2% HgCl2 for 4-5 minutes produces maximum contamination free explants without any toxicity. After surface sterilization, different explants were inoculated on gelrite gelled MS medium supplemented with different concentrations of 2,4-D for callus induction and with different concentrations and combinations of BAP and NAA for direct shoot induction. Nodal explants showed high callus induction potentiality (80%) on MS medium supplemented with 1.5 mg/l 2,4-D. The highest frequency of direct shoot induction from nodal segment was 80% and the number of shoots per nodal segment was(5.28±1.17) when they were cultured on MS medium supplemented with 3.0 mg/l BAP and 0.3 mg/l NAA. The highest shoot multiplication (83.33%) with maximum number of shoot per unit callus (5.62±1.24) and maximum shoot length (3.27±0.82 cm) was observed when the nodal calli were transferred in gelrite gelled MS medium in combination with 4.5 mg/l BAP and 0.5 mg/l NAA. Additionally, the incorporation of 4% sucrose and 10% coconut water with the above mentioned medium showed the satisfactory shoot growth and development with an average 7.84±1.30 shoots per unit of callus which was 4.21±0.78 cm in length. Moreover, addition of 3.0 mg/l GA3 with the above mention medium showed highest rate of shoot elongation (5.83±2.31cm). For root induction, in vitro raised shoots were transferred onto half-strength of MS liquid medium augmented with different concentrations and combinations of auxins (IBA and NAA). Maximum rooting (75%) were observed in halfstrength MS liquid medium supplemented with 0.5 mg/l IBA. After appropriate rooting the plantlets were successfully acclimatized (85% survival) when they were cultured in polybag containing (1:1:1) garden soil, sand and compost mixture before transferred to soil. Regenerated plants were morphologically identical with mother plants and showed their uniform growth in field condition. Jahangirnagar University J. Biol. Sci. 8(2): 1-11, 2019 (December)
This comprehensive study focuses on a checklist survey of wild mushrooms and documents their morphological variability and diversity at Jahangirnagar University, a natural and social forest area in Bangladesh. Through field studies on the campus grounds from June to October 2021, 60 samples were collected from which 40 species were identified by morphological characters, belonging to 33 genera, 26 families, and 10 orders. Most species were identified from the order Agaricales and the highest frequency (83.33%) from the orders Polyporales and Agaricales. The highest species abundance was 83.33% for Ganoderma spp., Crepidotus applanatus and the density was 70% for Marasmiellus candidus. The dominant species were Ganoderma spp., Coprinus disseminates, Marasmius spp., Schizophyllum commune, Calvulina coralloides. The wild mushrooms were prevalent in the natural forest areas of the Jahangirnagar University campus. As far as we are aware, this report is the very first work on wild mushrooms or macro-fungi on the campus of Jahangirnagar University. This survey shows that the campus grounds are enriched with a wide variety of wild mushrooms. Jahangirnagar University J. Biol. Sci. 11(1 & 2): 41-67, 2022 (June & December)
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