Pham Thi Phuong Thao * , Le Van Hoa , Nguyen Thi Kieu Mi and Bui Thien Quang

* Corresponding author (ptpthao@ctu.edu.vn)

Abstract

The aim of the study was to test the different concentrations of naphthalene acetic acid (NAA) and benzyladenine (BA) as foliar application on growth and flower quality of potted Tuong Vi rose (Rosa sp.). The experiment was laid out in completely randomized design (CRD) included five treatments: control (sprayed water), NAA and BA at two different concentrations at 25 and 50 ppm in six replications with one potted rose for each replication. The chemical solutions were applied with three sprays at an interval of fifteen days. The experimental results revealed that four pre-harvest foliar sprays of NAA and BA at 25 and 50 ppm concentrations showed maximum chlorophyll values (SPAD) (>50), length of flower branches (>27 cm), flower bud parameters and the flowering duration as compared to the control treatment. The maximum SPAD values at 30 days after pruning were obtained in NAA and BA at 25 ppm (recorded values of 53,8 and 543 respectively) and the minimum SPAD value (<50) was recorded under control treatment. Maximum values of flower bud parameters, flower diameters as well as the flowering duration were recorded in two pre-harvest foliar sprays of NAA and BA at 25 ppm, while minimum of those values were showed in control plants.
Keywords: BA, flower duration, growth, NAA, rose

Tóm tắt

Nghiên cứu thực hiện nhằm tìm hiểu ảnh hưởng của các nồng độ của naphthalene acetic acid (NAA) và benzyladenine (BA) phun qua lá đến sinh trưởng và chất lượng của hoa hồng Tường vi (Rosa sp.) trồng chậu. Thí nghiệm được bố trí theo thể thức hoàn toàn ngẫu nhiên với 5 nghiệm thức gồm đối chứng (phun nước), phun NAA và BA ở nồng độ 25 và 50 ppm, cách 15 ngày 1 lần. Thí nghiệm có 6 lần lặp lại, mỗi lần lặp lại là một chậu hoa hồng Tường vi. Kết quả thí nghiệm cho thấy xử lý NAA và BA ở các nồng độ 25 và 50 ppm đã giúp gia tăng chỉ số diệp lục tố (SPAD) (>50), chiều cao cành mang hoa (>27 cm), tăng kích thước nụ hoa và kéo dài thời gian hoa nở so với đối chứng. Xử lý NAA và BA ở nồng độ 25 ppm giúp chỉ số diệp lục tố SPAD của lá đạt cao nhất ở thời điểm 30 ngày sau khi cắt cành (tương ứng với 53,8 và 54) trong khi giá trị thấp nhất ghi nhận được ở nghiệm thức đối chứng (<50). Các nghiệm thức này cũng giúp gia tăng kích thước nụ hoa, đường kính hoa và kéo dài thời gian nở của hoa hồng Tường vi tốt hơn so với không xử lý.
Từ khóa: BA (Benzyladenine), Hoa hồng, NAA (Naphthalene Acetic Acid), Sinh trưởng, Thời gian nở

Article Details

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