ABSTRACT

Adventitious rhizogenesis was achieved successfully from mature culms of five commercially important bamboo species. Experiments were conducted to find out the effect of three auxins, namely, Indole-3 acetic acid (IAA), Indole-3-butyric acid (IBA) and Napthalene acetic acid (NAA) each at 200 ppm concentration in cuttings of three diameter classes (1–2 cm, 2–3 cm and 3–4 cm) in three different seasons on rooting in Bambusa nutans, B. vulgaris var. green, B. tulda, B. bambos and Dendrocalamus strictus. The treatments were evaluated for rooting percentage and root number and root length (cm) after 3 months. Three factor interactions (species x cutting diameter size x auxin type) were significant for rooting percentage in all the seasons. Rooting capacity of cuttings was significantly improved by the application of various auxins and IBA was screened out to be the most effective auxin and spring season was found to be the most effective season resulting in luxuriant root formation in cuttings. In this season, maximum rooting was obtained in B. nutans (76.25%) followed by B. vulgaris var. green (74.50%), B. tulda (63.33%), and D. strictus (35%) with maximum number of roots and root length on treatment of IBA. For B. bambos, 23.33% rooting was observed in summer season along with maximum number of roots and root length. Therefore, spring season followed by summer season using single nodal culm cuttings treated with 200 ppm IBA is recommended for production of quality planting material of these bamboo species.

摘要

从五种商业上重要的竹种的成熟秆中成功实现了不定根发生。进行了实验以找出三种生长素，即 Indole-3 乙酸 (IAA)、Indole-3-丁酸 (IBA) 和萘乙酸 (NAA)，每种浓度为 200 ppm 对三种直径等级的岩屑的影响（1-2 厘米、2-3 厘米和 3-4 厘米）在三个不同季节生根于Bambusa nutans, B. vulgaris var. 绿色、B. tulda、B. bambos和Dendrocalamus strictus. 3 个月后评估处理的生根百分比、根数和根长 (cm)。三个因素的相互作用（物种 x 切割直径大小 x 生长素类型）对所有季节的生根率都很显着。各种生长素的应用显着提高了插条的生根能力，筛选出IBA是最有效的生长素，发现春季是最有效的季节，导致插条生根茂盛。在这个季节，B. nutans (76.25%)获得了最大的生根，其次是B. vulgaris var。green (74.50%)、B. tulda (63.33%) 和D. strictus (35%) 在 IBA 处理中具有最大的根数和根长度。为了B. bambos,在夏季观察到 23.33% 的生根以及最大根数和根长度。因此，建议在春季和夏季使用经 200 ppm IBA 处理的单节秆插条生产这些竹种的优质种植材料。