School of Agriculture, University of Cambridge, England.
Planta. 1968 Sep;78(3):262-5. doi: 10.1007/BF00386426.
Exposing lettuce seed (variety Grand Rapids) to temperatures from 30°-42° C inhibits subsequent germination at 25° C. This inhibition can be overcome by the addition of gibberellic acid (GA) either during or after the heat treatment. Ethylene-bis-nitrourethane (EBNU) and ethylene dinitramine (EDNA), although without effect when applied alone, have been shown to increase the activity of GA when present in admixture during the heat treatment. The compounds act synergistically only when the seeds are kept at 30° and 35° C for 72 hours or longer.EBNU and EDNA do not increase the effectiveness of GA in breaking natural or heat induced dormancy in lettuce seeds.
将生菜种子（品种格兰德河）暴露在 30°-42°C 的温度下会抑制其在 25°C 下的后续发芽。这种抑制作用可以通过添加赤霉素（GA）来克服，无论是在热处理期间还是之后添加。尽管乙烯双亚硝脲（EBNU）和乙二硝胺（EDNA）单独使用时没有效果，但在热处理期间混合使用时，已证明它们可以提高 GA 的活性。只有当种子在 30°和 35°C 下保持 72 小时或更长时间时，这些化合物才会协同作用。EBNU 和 EDNA 不会增加 GA 在打破生菜种子自然休眠或热诱导休眠中的有效性。
