Towards the propagation of a critically endangered tree species Anisoptera scaphula

Abstract

Anisoptera scaphula (Roxb.) Kurz, the tallest tree species in Bangladesh, is critically endangered worldwide due to its poor natural regeneration. This study describes the appropriate regeneration technique for A. scaphula through seed germination and clonal propagation by stem cutting. The fastest and highest germination percentage (65) was observed in dewinged seeds sown inverted orientation with half buried position (T10) followed by dewinged seeds (62.5%) sown horizontally in full buried (T7) and delayed germination with lowest percentage (15) was in control (T0). Optimum initial growth was also shown when seedlings were developed from the seeds under T7. Both winged and dewinged seeds sown vertically in full buried or half buried position produced curved seedlings. However, dewinged seeds sown in horizontal or inverted (winged side down) position produced otherwise i.e., straight seedlings. The highest rooting percentages (63%) and maximum number of root (4.8) per cutting were obtained when one node cuttings treated with 0.8% IBA solution followed by 0.4% IBA in turn affecting for better survival and growth of rooted cuttings in the nursery conditions.

Propagation of threatened climber species Entada rheedii Spreng. – a medicinal plant with extremely thick and hard seed coat

“…However, the mean leaf number of rooted cuttings was insensitive to IBA treatment (Table 1). This was in accordance with the reports from Hossain et al (2014bHossain et al ( , 2019 as they found significantly higher survival of rooted cuttings for A. scaphula and P. neriifolius in nursery with IBA treatment over control. Also, Hossain et al (2011) obtained the highest (85%) survival in the F. jangomas cuttings treated with 0.4% IBA and the lowest in control.…”

“…Applied rooting hormone IBA is known to intensify the rooting ability of cuttings explained by several authors. For instance, Hossain et al (2014b) reported the highest rooting percentages (63%) and maximum number of root (4.8) per cutting when single node cuttings of Anisoptera scaphula stem were treated with 0.8% IBA solution followed by 0.4% IBA and the lowest was in control. Similar result was reported by Hossain et al (2019) for Podocarpus neriifolius D. Don.…”