Correlation Between the Contents of Amino acid Suggar and Chlorophyll in Cucumber Tissue and Their Resistance to Downy Mildew of Cucumber

doi:10.3321/j.issn:1000-7091.1993.04.011

Abstract

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

Yun Xingfu. Correlation Between the Contents of Amino acid Suggar and Chlorophyll in Cucumber Tissue and Their Resistance to Downy Mildew of Cucumber[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1993, 8(4): 52-58. doi: 10.3321/j.issn:1000-7091.1993.04.011.

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