Chinese Chive's Dormancy Characteristic And Change Of Soluble Sugar Content And Enzymes' Activity Over Winter

Eight Chinese chive cultivars were used to study dormancy character in different low temperatures and change of soluble sugar content and enzymes' activity. The main results were follows: 1. Using 'Dugenhong'and 'Pingjiu No.4'treated at 2℃,5℃,9℃in different days. The sprouting rate and growth rate were observed to determine the effects of different low temperature to dormancy. The process of dormancy could divided into initiated dormancy, deep dormancy and free dormancy according to behavior in room temperature after 5d, 10d, 15d, 21d, 28d, 35d and 42d treatment at different low temperature. In room temperature, 'Dugenhong'sprouted and grew quickly within fewer days to reach 60% sprouting rate when it was free from dormancy; it sprouted and grew slowly in deep dormancy, requiring more days to get 60% sprouting rate; it showed intermediate properties between in free dormancy and deep dormancy when it was in initiate dormancy. 'PingjiuNo.4'in room temperature sprouted and grown quickly and uniformly after endured different low temperature, indicating no dormancy characteristic. Both sprouting rate and growth rate could be used to determine dormancy state. 2℃-5℃is the suitable temperature for Chinese chive dormancy. "Dugenhong" needed 42 days to get free from dormancy in 2℃-5℃low temperature condition. 2. The soluble sugar content of root and rhizoma changed as double peaks curve from September to March next year, it increased from September to the middle of November while Chinese chive's leaves were dying away, then fell down to the lower level from November to December late or January, and then rose again till March, and then dropped after sprouting. During dormancy, the decrease of soluble sugar content was different due to dormancy types. The soluble sugar content of cultivars with natural dormancy decreased more than that of cultivars with no natural dormancy. 3. Before dormancy and after sprouting SOD and POD activity of leaves changed greatly, while CAT activity of leaves changed little. Before dormancy,...