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以探明银杏枝条的生长机理为目的，用茎尖培养的方法，研究了植物生长调节剂对银杏茎尖生长分化的影响。结果表明：① 萘乙酸（ Ｎ Ａ Ａ）促进银杏茎尖伸长生长和叶片分化，随 Ｎ Ａ Ａ 浓度增加其作用增强，在 Ｎ Ａ Ａ 为 ０１ ｍ ｇ／ Ｌ 时茎尖长度为对照的 １４７ 倍，分化叶数为对照的 ２６２ 倍，茎尖干重为对照的 ６４５ 倍。② 玉米素（ Ｚ Ｔ）抑制银杏茎尖生长，随着 Ｚ Ｔ 浓度增加，其抑制效应增强，在 Ｚ Ｔ 浓度为 １ ｍ ｇ／ Ｌ时，其茎尖长度为对照的 ５５５１％ 。③ 赤霉素（ Ｇ Ａ３ ）对银杏茎尖伸长生长和叶片分化没有促进作用，但随着 Ｇ Ａ３ 浓度提高，茎尖干物质增加。④ 在 Ｎ Ａ Ａ 与 Ｚ Ｔ 综合处理区，当 Ｎ Ａ Ａ≤００１ ｍ ｇ／ Ｌ 时， Ｚ Ｔ 抑制银杏茎尖生长，当 Ｎ Ａ Ａ 达到 ０１ ｍ ｇ／ Ｌ时，转而促进茎尖生长。
In order to explore the growth mechanism of ginkgo shoots, the shoot tip culture method was used to study the effects of plant growth regulators on the shoot apical ginkgo growth differentiation. The results showed that: ① NAA promoted the elongation and leaf differentiation of ginkgo shoots, and its effect was enhanced with the increase of NAA concentration. When NAA was 01 g / L, the shoot length was the control 147 times of the number of differentiated leaves 262 times the control, stem tip dry weight of the control of 645 times. ② Zeatin inhibited the shoot tip growth of Ginkgo biloba, and its inhibitory effect was enhanced with the increase of ZT concentration. When the ZT concentration was 1 m g / L, the shoot tip length was 5551% of the control. ③ Gibberellins (G A3) did not promote the elongation and leaf differentiation of ginkgo shoot tips, but increased the shoot dry matter with the increase of G A3 concentration. ④ In the N A A and Z T combined treatment ZT inhibited the growth of shoot tip of Ginkgo biloba when N A A ≤001 m g / L, when N A A reached 01 m g / L, Promote shoot tip growth.