关键词: 西花蓟马, 西花蓟马, 低温, 生长发育, 繁殖

Abstract: This study aimed to better understand the seed germination characteristics of Chinese medicinal species Stachytarpheta jamaicensis and the mothed of breaking-dormancy and further provide some basic information for cultivation. Methods: Seeds of S. jamaicensis stored dry stored at room temperature, or wet stored at 15°C, 4°C and 0°C for 30 d were tested for germination at 25°C or 25°C/15°C for 30 d; and also seeds were tested for germination incubated at six temperature gradient (15℃,20℃,25℃,30℃,35℃,40℃)for 30d. Results: The viable of fresh seeds of S. jamaicensis were 92%, germination were 10%-49.3%, showing some seeds of this species had dormancy. Seeds of S. jamaicensis following dry stored at room temperature, wet stored 15℃and 4℃had a higher germination than that of fresh seeds, and while germination of these seeds at 25/15℃were higher than that at 25 ℃.There were differnt germination response to incubation temperature. Germination percentage of seed incubated at 30°C and 35°C were less than 20%, whereas that at 20°C and 25°C reached 72.7% and 56%,respectively. Conclusion: Dry storage at room temperature and warm (15℃) and cold stratification (4℃) for S. jamaicensis can be efficient methods to break dormancy. The optimum temperature for seed germination is 20℃ and 25℃.