NGHIÊN CỨU KỸ THUẬT NHÂN GIỐNG CHIẾT GỐC CÀNH LOÀI TRE NGỌT (Dedrocalamus brandisii (Munro) Kurz)

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Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2020

Mô tả vật lý: tr.193-200

Bộ sưu tập: Báo, Tạp chí

ID: 307773

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Dendrocalamus brandisii (Munro) Kurz is a species of bamboo that has great economic value. This species can be effectively propagated by stem extraction method. Research and experiment on different types of growth stimulants IBA, IAA and NAA at concentrations of 500 ppm, 1500 ppm and 2000 ppm in spring season show that IBA 1500 ppm is the best selected growth stimulant while at the same time, compare them with stump extract in different seasons. As a result, the use of IBA biotrophic substances in spring season was better than in autumn season. Using IBA (1500 ppm) in spring season gave the highest results, including: the survival rate after 28 days reached 97.8%, the number of shoots/ cuttings was 3.61 buds, the number of roots/ stump was 20 roots, root length was 6.9 cm and survival rate after cuttings at the nursery was 92%. The study also showed that using a mixture of potting medium with ingredients of 68% of topsoil soil + 2% NPK + 30% chopped straw resulted in the highest average number of roots/ stump as 6.4 roots and root length as 4.5cm. This result contributes to the completion of the asexual propagation for Dendrocalamus brandisii (Munro) Kurz to meet the breeding needs for this species in Vietnam.Tre ngọt (Dendrocalamus brandisii (Munro) Kurz) là một loài thuộc họ tre trúc có giá trị kinh tế lớn. Loài này có thể nhân giống vô tính hiệu quả bằng phương pháp chiết gốc cành. Nghiên cứu thử nghiệm các loại kích thích sinh trưởng IBA, IAA và NAA ở các nồng độ 500 ppm, 1500 ppm và 2000 ppm ở vụ Xuân, lựa chọn được chất kích thích sinh trưởng IBA 1500 ppm là tốt nhất
đồng thời tiến hành so sánh với chiết gốc cành vào các thời vụ khác nhau. Kết quả cho thấy, sử dụng chất kích thích sinh trưởng IBA vào vụ Xuân tốt hơn so với vụ Thu. Sử dụng IBA (1500 ppm) vào vụ Xuân cho kết quả cao nhất, gồm: tỷ lệ sống sau 28 ngày đạt 97,8%, số lượng chồi/gốc cành chiết là 3,61 chồi, số rễ/gốc cành chiết là 20 rễ, chiều dài rễ đạt 6,9 cm và tỷ lệ sống sau giâm hom tại vườn ươm đạt 92% là tốt nhất. Nghiên cứu còn chỉ ra sử dụng hỗn hợp ruột bầu có thành phần: 68% đất tầng mặt + 2% NPK + 30% rơm rạ băm nhỏ cho kết quả số rễ trung bình/gốc cành chiết là 6,4 rễ và chiều dài rễ là 4,5cm là cao nhất. Kết quả này góp phần hoàn thiện quy trình nhân giống vô tính cho loài Tre ngọt nhằm đáp ứng nhu cầu phát triển loài này ở Việt Nam.

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