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根据七个甘薯品种抗根腐病特性鉴定的结果,用分光光度法和薄层扫描分光光度法来检测受根腐病菌侵染后甘薯块根组织中呋喃类萜植保素的含量。结果表明,接种根腐病菌后的早期状态中,抗病品种徐薯18侵染组织内积累呋喃类萜植保素的速度较快,且含量较高,而感病品种胜利百号积累呋喃类萜植保素速度则较慢,且含量小。于接种24和48小时后分析各个抗感品种病部的呋喃类萜植保素含量与其对根腐病的抗病性高度相关。据此,建议将接种后产生呋喃类萜植保素的特性作为衡量甘薯品种对根腐病抗性的参考指标。
According to the results of identification of root rot resistance of seven sweet potato cultivars, the content of furan terpene phytoalexin in root tuber of sweet potato was detected by spectrophotometry and TLCS. The results showed that in the early stage after inoculation of root rot pathogen, the furan terpenoid phytoalexin accumulated in the resistant variety Xushu 18 was faster and higher, while the susceptible variety Shengli Bai accumulated furan terpenoid Phyto-elemental speed is slower, and the content is small. Analysis of the content of furan terpenoid phytoalexins in diseased part of each resistant variety at 24 and 48 hours after inoculation was highly correlated with its resistance to root rot disease. Therefore, it is suggested that the characteristics of furan terpene phytoalexins produced after inoculation are used as a reference index to measure the resistance of sweet potato varieties to root rot.