Research on isozyme phenotypes and pathogenicity of Ditylenchus destructor in sweet potato
Two isozymes from 10 populations of sweet potato stem nematode, Ditylenchus destructor, were analyzed, as well as the weight loss of sweet potato, pathogenicity, fecundity and sex ratio of these 10 populations by inoculation test in two varieties of sweet potato. The results show that among the 10 p...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2009-07-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2009.04.012 |
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| Summary: | Two isozymes from 10 populations of sweet potato stem nematode, Ditylenchus destructor, were analyzed, as well as the weight loss of sweet potato, pathogenicity, fecundity and sex ratio of these 10 populations by inoculation test in two varieties of sweet potato. The results show that among the 10 populations, there were three main bands of malate dehydrogenase (MDH), which were corresponding to two different phenotypes. Rf was about 0.21,0.26 and the other was 0.21,0.26 and 0.31, but esterase (EST) was no band. The pathogenicity, fecundity and sex ratio of the 10 populations were significant at the P=0.05 level, the highest pathogenicity population was from DeHB. There were positive relationships between fecundity and pathogenicity on the Sushu No.9 and Ningshu 9-9. Partial correlation analysis showed that there was negative relationship between fecundity and sex ratio of the 10 populations on the Sushu No.9 and significant positive relationship on the Ningshu 9-9, and their coefficients were -0.213, 0.901, respectively, indicating that the sex differentiation of D. destructor was significantly affected by the different varieties of sweet potato. In addition, the Ningshu 9-9 was 33.48% higher than the Sushu No.9 in the resistant to D. destructor, and 19.86% higher in preservation. |
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| ISSN: | 1008-9209 2097-5155 |