烟草生物碱生物合成的水平是受基因控制的,但外界因素对生物碱的形成也有着明显的影响(Mike1962)。影响植物组织生长的因素如N、P、K 和其它元素的供给、温度、土壤湿度和海拔高度等都会影响生物碱的合成(沃勒1984)。在上述四种生物碱中,烟碱不仅分布广,而且它是烟草的一个主要生物碱,与烟叶品质密切相关,它在烟叶内含量高低常作为衡量烟叶品质的一项十分重要的化学成分指标,因此,从遗传因 The level of tobacco alkaloid biosynthesis is genetically controlled, but outside factors also have a significant effect on alkaloid formation (Mike 1962). Alkaloid synthesis is influenced by factors that affect plant tissue growth such as N, P, K and other elements, temperature, soil moisture, and altitude (Waller 1984). Among the above four alkaloids, not only nicotine is widely distributed, but also it is a major alkaloid of tobacco, which is closely related to the quality of tobacco leaves. Its nicotine content in tobacco leaf is often used as a very important indicator of the quality of tobacco leaf Therefore, from genetic causes