2种多胺对铁皮石斛瓶内开花的影响

以铁皮石斛无根组培苗为试验材料,研究不同浓度的外源腐胺（Put）和精胺（Spm）对铁皮石斛瓶内开花的影响。结果表明：培养基中添加适量的Put和Spm可提高开花率。当Put浓度为0.4 mg/L时,铁皮石斛瓶内开花率最高,为30.47%;Spm浓度为0.2 mg/L时,铁皮石斛瓶内开花率最高,为22.26%;Put浓度为0.2 mg/L时,铁皮石斛始花期最短,为83.33 d,观赏期最长,为43.33 d。Put浓度为0.4 mg/L时,植株可溶性糖和可溶性蛋白含量最高;对照处理下植株全N含量达最高;Spm浓度为0.6 mg/L时,植株C/N比达最大。Put浓度为0.4 mg/L时,有利于铁皮石斛组培苗碳氮化合物的积累,可提高铁皮石斛的开花率;Put浓度为0.2 mg/L时,能使花期提前,延长观赏期。Spm浓度为0.4 mg/L时,有利于铁皮石斛组培苗株高增长和生根,促进铁皮石斛组培苗的营养生长。

Effects of Two Polyamines on in Vitro Flowering of Dendrobium officinale Kimura et Migo

The effects of different concentrations of exogenous putrescine (Put) and spermine (Spm) on the flowering of Dendrobium officinale Kimura et Migo were studied using the rootless plantlets in vitro. The flowering rate of D. officinale could be increased by adding appropriate amount of Put and Spm in the medium. The flowering rate of D. officinale was the highest (30.47%) when the concentration of Put was 0.4 mg/L, and the flowering rate of D. officinale was 22.26% when the concentration of Spm was 0.2 mg/L. The time to have the first flower bud appeared of D. officinale was the shortest (83.33 d) when the concentration of Put was 0.2 mg/L, and the viewing period of D. officinale could be prolonged by 43.33 days. When the concentration of Put was 0.4 mg/L, the content of soluble sugar and soluble protein was the highest. The content of total N was the highest in CK. When the concentration of Spm was 0.6 mg/L, the C/N ratio of the plant was the highest. The concentration of Put 0.4 mg/L would be beneficial to the accumulation of carbon and nitrogen compounds, which could promote the flowering rate of D. officinale.