Grafting Effects on Root Activity and Amino Acid Contents in Bleeding Sap of Muskmelon
2009
Li, Tianlai (Shenyang Agricultural University, Shenyang, China), E-mail: [email protected] | Liu, Yifei (Shenyang Agricultural University, Shenyang, China) | Qi, Hongyan (Shenyang Agricultural University, Shenyang, China) | Bai, Chunming (Shenyang Agricultural University, Shenyang, China)
The grafting effects on the yield and quality of muskmelon fruits were studied based on the measurements of root activity, acidity, electric conductivity and amino acids of bleeding sap. The results revealed that grafting enhanced significantly the activities of root systems and increased the volume and electric conductivity of bleeding sap in muskmelon during growth period. The fruit yield of grafted plants increased by 9.12%. The amino acids in bleeding sap of self-rooted and grafted muskmelon mainly consisted of threonine and glutamic acid. Grafting decreased significantly the contents of threonine, glutamic acid, cysteine, lysine and NH₃ in bleeding sap in the early and late growth stages, but increased the contents of aspartic acid, threonine, serine, glutamic acid, alanine, valine, isoleucine, leucine, tyrosine, phenylalanine, lysine, histidine and arginine in the middle growth stage. In the late growth stage, the contents of threonine, glutamic acid, cysteine, lysine and arginine in bleeding sap of grafted plants were reduced by 44.88%, 52.45%, 41.67%, 58.62% and 62.61%, respectively. The total amino acid content of self-rooted and grafted muskmelon plants showed the same trend of high-low-high in the whole growth period. In the early and late growth stages, the total amino acid content of self-rooted plants was significantly higher than that of the grafted plants. The increment of total amino acid in self-rooted muskmelon from middle to late growth stage was also greater than that in grafted muskmelon. It is suggested that the nutritional quality of grafted muskmelon fruits might be due to the changes of amino acid supply in bleeding sap.
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