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Comparative studies on some physiological and biochemical characters in white and brown cysts of Heterodera glycines race 4

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Previous research showed that the hatch of second-stage juveniles (J2) from white females (cysts) was significantly different from that of J2 from brown cysts, which indicated that there were differences in diapause between J2 in white and brown cysts. In order to find out the relationships between some biochemical characters and diapause of Heterodera glycines, hatch rate and biochemical indices (total carbohydrate, glycogen, trehalose, glycerol and protein, and activity of esterase and trehalase) in white and brown cysts of H. glycines race 4 were studied. The results suggested that hatch rate of J2 from brown cysts was significantly lower than that of J2 from white cysts. The glycogen and protein content and the activity of esterase in brown cysts were lower than in white cysts, whereas the total carbohydrate and trehalose content and the activity of trehalase in brown cysts were higher than in white cysts. Therefore, diapause in unhatched J2 in brown cysts was more extensive than that in J2 in white cysts, and active mutual transformation between trehalose and glycogen existed in brown cysts. SDS-PAGE patterns showed that there are 15 and 10 protein bands in white and brown cysts, respectively, and proteins of molecular masses 116.6, 79.1, 68.2, 64.3 and 60.5 kDa existed in white cysts, but were not present in brown cysts. There were three and six bands in patterns of esterase isoenzymes in white and brown cysts, respectively; EST0.63, EST0.75, EST0.81 of esterase isoenzymes occurred in brown cysts but not in white cysts. The result suggested that protein content declined and activity of esterase isoenzyme was enhanced during the transition from white to brown cyst. The low hatch rate of J2 from eggs in brown cysts might be related to these indices.

Affiliations: 1: College of Plant Protection, Shandong Agricultural University, Tai'an 271018, Shandong, China; 2: College of Plant Protection, Shandong Agricultural University, Tai'an 271018, Shandong, China;, Email:


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