目的 探索“85 - 5”脱毒苗的快速繁殖技术。方法 将脱毒苗接种在不同培养基 (单位 :m g/ L) (1.MS+BA0 .5 ;2 .MS+BA 0 .5 +NAA 0 .0 2 ;3.MS+BA 0 .5 +NAA 0 .0 2 +GA30 .1;4 .1/ 2 MS+BA 0 .1;5 .1/ 2 MS+BA0 .1+GA30 .1;6 .1/ 2 MS+GA30 .1)上,30 D后统计新生叶片数、根数以及苗高等。然后选用 2号培养基,在不同的培养条件下培养,同上记录有关数据。结果 在 1,2和 3号培养基上,具茎尖苗主茎发育良好,基部具 1～ 3个腋芽 ;无茎尖苗腋芽发育,主芽长 0 .5～ 1.5 cm。 4,5和 6号培养基上脱毒苗细弱,叶少根多。在相同光照条件下,2 8℃时,各项测量值均显著高于 2 3℃时的值 ;在相同温度下,低光照培养,叶小苗高,强光则相反。此外,还发现 BA和 GA3之间存在拮抗作用。结论 在 2 8℃,10 0 0～ 2 0 0 0 lx培养条件下,采用 2号培养基适于“85 - 5”脱毒苗的快速繁殖。

Object To develop a method of multiplying virus free clonal seedlings of CV.85 5 of Rehmannia glutinosa (Gaert.) Libosch. ex Fisch. et Mey.. Methods The leaf cut segments with or without tips of plantlets were grown in different media (mg/L) (1.MS+BA 0.5; 2 MS+BA 0.5+NAA 0.02;3 MS+BA 0.5+NAA 0.02+GA 3 0.1; 4 1/2 MS+BA 0.1; 5 1/2 MS+BA 0.1+GA 3 0.1; 6.1/2 MS+GA 3 0.1) to select a suitable medium, and the height and the numbers of newly formed leaves and roots were recorded 30 days later. To screen out a favorable condition, similar segments were transferred to No.2 medium at different temperatures in different illuminations, and the height together with the leaf number and the fresh weight of the plantlets was recorded.Results In the former three media, the segments with tips were flourishing and one to three axillary buds were formed at its basal stem; while in those without tips almost every axillary bud developed with the main tip length 0.5～1.5 cm. In the later three media, thd elongation of the segments was usually overstimulated, and the slim plantlets with fewer leaves and more roots formed. When the segments cultured in No.2 medium, all records at 28 ℃ were higher than those at 23 ℃ in the same illuminations. But the leaf size and the height of the plantlets were inversely proportional to the intensity of illumination at the same temperature. In addition, antagonism between BA and GA 3 was found.Conclusion No.2 medium is more suitable for the multiplication of the virus free seedlings of 85 5 when cultured at 28 ℃ in the illumination of 1 000～2 000 lx.

国家自然科学基金重点项目(39930220)