春兰×大花蕙兰杂种试管苗开花现象

以野生春兰(Cymbidiumgoeringii)为母本,大花蕙兰(C.hybridium)为父本进行杂交,由杂交种子获得800多个春兰×大花蕙兰杂种原球茎无性系。其中一个杂种株系的原球茎继代培养2个月后,形成肉眼可见的花蕾。诱导花芽形成的最适激素组合为6-BA1.0mg/L+NAA0.1mg/L,总花芽形成率达31%。诱导花芽形成的最适材料为1￣2cm幼苗,花芽形成率达19%。

In vitro Flowering of Cultures from a Hybrid of Cymbidium goeringii and C. Hybridium

Wild-type female spring orchid (Cymbidium goeringii) was crossed with male Cymbidium hybridium. Over eight hundred protocorm clones were obtained from hybrid offsprings. Among them, one protocorm clone was identified to differentiate visible floral buds two months after subculture in vitro (Plate I). The protocorms and shoots derived from this clone were further used in studying the effects of abscisic acid (ABA) and paclobutrazol (PP333) pretreatment as well as different concentrations of 6-benzyladenine (6-BA) on floral bud differentiation. The optimum combination of hormones in floral bud induction was 6-BA 1.0 mg/L and NAA 0.1 mg/L, and total frequency of floral bud formation was up to 31% (Table 1). The optimum length of shoots used in floral bud induction was 1-2 cm, and the frequency of floral bud formation was 19% (Table 1). The increase in total frequency was not significant in floral bud induction from protocorms and shoots with length of 1-2 cm or 2-4 cm cultured on MS medium containing 6-BA 1.0 mg/L and NAA 0.1 mg/L after pretreatment on MS medium supplemented with ABA 0.5 mg/L and PP333 0.5 mg/L for 35 d (Table 2).