关键词: 牛, 牛, 成纤维细胞, 组织块培养法

Abstract: In order to solve the constraints of low temperature in flue-cured tobacco seedlings, improve the rate of tobacco seedling, the research of water warming technology in floating system for tobacco seeding was conducted. The results showed that, by water warming technology, seedling pond water temperature reached an average of 20.06℃, which can provide suitable temperature seedling growth, promote tobacco seed germination and seedling growth and development, shorten the seedling stage 12 days. It helped improve the quality of tobacco seedlings: the seedling rate reached 86%, more stout stem, stem height and girth reached 11.2 cm and 1.8 cm respectively, seedling root system more development, more dry matter accumulation ,which was good for tobacco seedling growing faster in field, and plant height, stem girth, effective leaf number and leaf length, width varying increased. It benefited to improve the yield and quality of tobacco, the yield was increased 1847.85 yuan per hm2. However, it needed higher operating costs, so more facilities were to be further improved.