沙生柽柳扦插生根过程及其插穗内源营养物质的变化

Cuttings Rooting Process and Changes of Endogenous Nutriments During the Rooting of Tamarix taklamakanensis

为了探讨沙生柽柳无性繁殖生根机理,在室内扦插培养的条件下,笔者对沙生柽柳扦插生根过程进行观察,并对插穗培育过程中的内源营养物质进行动态测定分析。结果表明:沙生柽柳插穗生根类型为皮部生根型,切口处未形成愈伤组织,不定根可突破插穗表面皮层而长出;沙生柽柳扦插生根过程中,可溶性糖含量先升高后降低最后呈现稳定的变化过程,可溶性蛋白质呈现平缓降低到加速升高的变化趋势;IBA可诱导沙生柽柳插条内源营养物质的形成,测定插条可溶性糖及可溶性蛋白质含量变化幅度明显高于对照;1年生硬枝插条中可溶性糖与可溶性蛋白质含量变化幅度高于多年生老枝,这由枝条木质化程度及其代谢的强弱不同所致。

In order to explore asexual reproduction rooting mechanism of Tamarix taklamakanensis, under thecondition of indoor cuttings cultivation, the morphologic observations were conducted and changes of solublesugar and protein content in Tamarix taklamakanensis cuttings during rooting were measured. The resultsshowed that the cuttings rooting type of Tamarix taklamakanensis was primordiums rooting, there was no calluson the cut and adventitious roots grew from the surface layer of the cuttings. The soluble sugar contentincreased firstly, then decreased and became stable in the last during Tamarix taklamakanensis cuttingsrooting process, in the meantime, the soluble protein content reduced gently firstly, then had an acceleratedrise. IBA could induce the endogenous nutrients formation of Tamarix taklamakanensis cuttings, with thevariation range of soluble sugar and soluble protein content was significantly higher than that of thecomparison. The variation range of soluble sugar and soluble protein content of one year hard branch cuttingwas higher than that of the perennial old branch, which was caused by the difference of the branch lignificationdegree and their metabolism strength.