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Morphometric Relationships of Some Members of the Heterodera a Venae Complex (Nematoda: Heteroderidae)

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A detailed morphological and biometrical study was made of eight Spanish, two British and two Swedish populations of the Heterodera avenae complex. Morphometrical data have been statistically evaluated. Monovariate analysis (Student's t test) was applied to measurements of cysts, cone tops, eggs and juveniles, and multivariate analysis (discriminant analysis and two clusters) was applied to measurements of juveniles. Results demonstrated that there are two well differentiated groups within the H. avenae complex. One is represented by British Ha 11, Spanish Sp. 1 and Swedish Sw. 1 populations. This agrees with previous descriptions of H. avenae. The second group, represented by British Ha 23, Spanish Sp. 3 and Swedish Sw. 2, agrees with previous descriptions of British pathotype 3, Götland race and H. filipjevi. The two groups are well differentiated by size and colour of old cysts and cone top structures. Spanish populations Sp. 1 and Sp. 3 are best differentiated by the measurements, and significant differences have been shown in 25 of the 29 parameters considered, compared with 14 in British and 11 in Swedish populations. The Spanish populations are more similar to the British than to Swedish populations of the same group as shown by the results of Student's t test. The characters useful for differentiating groups in both Spanish and British populations were: length as well as width of cysts, length of body, tail and hyaline region of tail, "c" and hyaline region of tail/stylet length in juveniles. The measurements of vulva slit length and fenestra size which differentiate H. filipjevi from H. avenae may also differentiate Spanish populations but not British populations.

Affiliations: 1: Instituto de Edafologia y Biologia Vegetal. CSIC Serrano, 115 dpdo. 28006 Madrid, Spain


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