How to breed Sijimei

Four-season plum, also known as sunshine spring, sunshine spring, sunshine spring, Catharanthus roseus, four-season spring, five-petal plum, wild goose, blooming every day and so on. Four seasons do not fade. Native to Madagascar and India, there are many horticultural varieties. Commonly used methods include sowing, cutting and tissue culture and propagation. The first kind: sowing and breeding, sowing in April. Catharanthus roseus has 750 seeds per seed, and the suitable temperature for germination is 18~24. The mixed soil of humus soil, culture soil and fine sand is sterilized in the sowing tray and germinated 14-2 1 day after sowing. At noon after emergence, strong light and high temperature need to be shaded for 2~3 hours. When the seedlings are 5cm high and have 3 pairs of true leaves, they can be potted. Second, cutting propagation: in spring or early summer, the shoots are cut off, the length is 8~ 10 cm, the lower leaves are cut off, and the top 2~3 pairs of leaves are reserved, which are inserted into sand beds or decomposed soil, and the inserted soil is kept slightly wet at room temperature of 20 ~ 24℃, and roots are born after 15~20 days. The third type: tissue culture and propagation takes stem tips as explants. Cut the sterilized stem tip into several sections, each section is 0.4 ~ 0.6 cm, and inoculate it on MS medium containing 5 mg /L6- benzylamino adenine and 0.2 mg/L NAA, and cultivate for one month to grow adventitious buds. Then transfer to 1/2MS medium, and add 0.2mg/L kinetin and 2mg/L indoleacetic acid. After half a month, the white roots began to grow and become complete plants.