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Several biochemical components of white and brown cysts in the cereal cyst nematode were measured and compared in our study. These components included carbohydrate, glycerol, soluble protein, esterase and trehalase. Results showed that the total carbohydrate, glycogen and soluble protein contents were higher in the white cysts than in the brown cyst, whereas the glycerol content was lower in the white cysts than in the brown cysts. Trehalase activity was lower in the white cysts than in the brown cysts, whereas esterase activity was higher in the white cysts than in the brown cysts. Only one esterase band, EST0.20, in both types of cysts was observed in the esterase isoenzyme pattern; the esterase in the white cysts showed a darker band and exhibited more activity than the esterase in the brown cysts. Sodium dodecyl sulfate–polyacrylamide gel electrophoresis analysis indicated that the protein pattern in the white cysts had darker and more protein bands of high molecular weight (>44.3 kDa) than that in the brown cysts. For protein of lower molecular weight (≤44.3 kDa), the pattern bands in the brown cysts were remarkably darker than those in the white cysts. The amount of protein in the white cysts differed from that in the brown cysts. The biochemical components signals and response may provide useful information for exploring nematode physiology. © 2017 Friends Science Publishers

Comparison of Biochemical Components within White and Brown Cysts in the Cereal Cyst Nematode Heterodera avenae