摘要:
1985～1987年室内多菌株测定和病区广泛鉴定结果:甘薯品种330对甘薯瘟病表现抗病反应,闽抗329、华北48表现中抗,广薯15表现中感,而新种花和惠红早则表现感病反应。试验统计表明:330等6个甘薯品种间对甘薯瘟病的抗性差异显著或极显著。甘薯品种的游离氨基酸含量测定结果:330等6个甘薯品种的游离氨基酸平均含量有明显和稳定的差异,且其差异显著。试验分析结果:甘薯品种的薯瘟病发病程度与游离氨基酸含量呈正相关。薯瘟病发病程度越轻的品种,游离氨基酸含量越低,品种的抗瘟性就越强;而发病程度越重的品种,游离氨基酸含量越高,品种的抗瘟性就越弱。根据18种游离氨基酸含量的差异性对6个品种进行相似性聚类分析,结果与品种的抗病性划分基本一致,进一步证实了游离氨基酸与品种抗瘟性的关系。
Abstract:
During 1985-87, the sweet potato varieties were tested for disease resistance by using strains of sweet potato bacterial wilt (Pseudomonas solanacearum) in green houses and in wide disease areas. The results were obtained as follows: the variety 330 was resistant, Min Kang 329 and Hua Bei 48 medium-resistant, Guang Shu 15 medium-susceptible, Xin Zhong Hua and Hui Hong Zao susceptible. Statistics for the test data showed the resistance differences between the 6 varieties including 330 were remarkable or extremely remarkable. The results of test for amino acids showed that the difference in the mean amount of amino acids between the six varieties was distinct and stable. The test and analysis showed that the relationships between the disease severity and the amount of amino acids were positive inter elation. The less amount of amino acids in the variety, the more resistant the variety was. However, the more amount of amino acids in the variety, the more susceptible the variety was. Cluster analysis in an average way has proved the relationships. Fig. 1 shows the rescaled distance cluster combine.
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