摘要： 对黄瓜霜霉病抗性不同的黄瓜品种氨基酸含量进行测定，结果表明，在萌动种子内，除谷氨酸、赖氨酸和NH₃外，其它氨基酸的平均含量抗病品种高于感病品种；在子叶内，除胱氨酸、苯丙氨酸和NH₃外，其它氨基酸含量感病品种高于抗病品种；不同叶位真叶的氨基酸含量随着叶位上升（叶龄的减小）而增加，同一叶位的各种氨基酸含量抗病品种高于感病品种，各叶位氨基酸的平均含量抗病品种也高于感病品种，其中胱氨酸、苯丙氨酸和NH₃的差异达显著或极显著，据此，胱氨酸、苯丙氨酸和NH₃的含量与黄瓜对霜霉病的抗性呈显著正相关性。黄瓜子叶和同一植株不同叶位真叶内可溶性总糖含量与抗病性呈高度正相关性；还原糖含量和还原糖与总糖比及叶绿素A的含量与抗病性呈高度负相关；叶绿素B和叶绿素总量与抗病性无明显相关。

关键词: 黄瓜, 组织, 氨基酸, 糖, 叶绿素, 霜霉病

Abstract: The contents of amino acid, sugar and chlorophyll in different cucumber varieties with different resistance to downy mildew of cucumber were tested. As a result, the contents and the kinds of amino acid in germinated seed, cotyledon and true leaves on different nodes of cucumber plant were quite different. The results showed that there were significant positive correlations between the contents of cystine, phenylalanine, NH₃and the resistance to downy mildew of cucumber, and between the contents of soluble to talsugar in cotyledon and true leaves on different nodes of a same cucumber plant and the resistance to the disease. There were a significant negative correlation between the contents of reducing sugar, the reducing sugar to total sugar ratio, chl.a and the resistance to the disease. But there was ignificant correlation between the total amounts of chlorophyll as well as chl.b and the resistance to the disease.

Key words: Cucumber tissue, Amino acid, Sugar, Chlorophvll Downy mildew of cucumber, Resistance