关键词: 无公害茶叶, 无公害茶叶, 亚硝酸盐, 残留, 调控对策

Abstract:

Using polyethylene glycol (PEG)-6000 for simulating water stress, the drought resistance of 66 maize local varieties was evaluated according to germination index of drought resistance, vigor index of drought resistance, relative germination ratio, transformation percentage of stored substance and 100-grain weight, in seedling emergence experiment. The results indicated that germination index of drought resistance was the primary selecting indicator, and for all completely evaluating the drought tolerance ability other indicators should be used. There was significant difference in drought resistance of 66 maize landraces, and there were 18 resources have strongly drought resistance, and 5 resources display the greatly strengthened drought resistance in many indicators. Screening in the maize local varieties the fine drought-resistant gene resources had been selected, and the theory basis for further drought-resistant breeding had been provided.