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The effects of temperature and ethylene on the quality of snapdragon flowers (Antirrhinum majus L. cvs. ‘Potomac Pink’ and ‘Rocket’) after harvest were investigated. The flowers were stored dry or wet at 6 temperatures ranging from 0 to 12.5 °C for 5 days. Vase life and gravitropic bending were measured at 20 °C after storage. Respiration rates of flowers at 8 different temperatures (0, 2.5, 5, 7.5, 10, 12.5, 15 and 20 °C) were measured continually using a computerized system. The respiration of cut snapdragon flowers increased exponentially as the temperature increased from 0 to 20 °C, with a mean Q10 of 2.6. The vase life of flowers of the ‘Potomac Pink’ cultivar stored dry at 0 °C was 10.8 days, similar to that of freshly harvested controls (10.6 days), and 4.4 days longer than that of flowers stored at 7.5 °C. When spikes were placed horizontally at 20 °C, growth became negatively gravitropic within 20 min. Bending was significantly higher than controls (stored vertically) in all flowers stored horizontally at temperatures above 5 °C. Vase life of flowers stored for 5 days at a range of temperatures then placed in an interior environment was directly correlated with respiration rate at the storage temperature. Wet storage of cut snapdragon flowers reduced the loss of quality at storage temperatures above 5 °C but the vase life of flowers stored in water at 12.5 °C was less than half that of flowers stored dry at 0 °C. Ethylene treatment caused 100% floret abscission which was prevented by pre-treatment either with 1-methycyclopropene (1-MCP) or with silver thiosulfate (STS), but neither of these inhibitors prevented gravitropic bending.  相似文献   
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以白苏子(Perilla frutescens)花青素糖基转移酶基因为探针,通过电子克隆和RT-PCR的方法从金鱼草(Antirrhinum majus L.)叶片中克隆到花青素糖基转移酶基因(Am GT1)的全长c DNA,并对其表达特性进行分析。结果表明:Am GT1全长892 bp,编码277个氨基酸;进化分析表明Am GT1的氨基酸序列与白苏子的同源性最高为79%,与其他花青素糖基转移酶蛋白的同源性在42%~62%之间,表明Am GT1是从金鱼草中克隆的新的花青素糖基转移酶基因。实时定量RT-PCR分析表明:该基因在金鱼草叶片中的表达量最高,根中的表达量最低;该基因虽然在红色、粉色、黄色、白色花朵中均有表达,但在红色花朵中的表达量最高,且存在一个从紧蕾期到松蕾期的跃变。  相似文献   
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