PT  - JOURNAL ARTICLE
AU  - C. P. Meredith
AU  - L. A. Lider
AU  - D. J. Raski
AU  - N. L. Ferrari
TI  - Inheritance of Tolerance to <em>Xiphinema Index</em> in <em>Vitis</em> Species
AID  - 10.5344/ajev.1982.33.3.154
DP  - 1982 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 154--158
VI  - 33
IP  - 3
4099  - http://www.ajevonline.org/content/33/3/154.short
4100  - http://www.ajevonline.org/content/33/3/154.full
SO  - Am J Enol Vitic.1982 Jan 01; 33
AB  - Previous work has demonstrated that there is variability among Vitis species for tolerance to the parasitic nematode, Xiphinema index. Based upon this information, crosses were made among a number of tolerant and susceptible Vitis species and cultivated varieties. The seedling progeny of each cross were evaluated for tolerance based upon visible root symptoms. On the basis of segregation patterns observed in these progeny, two tentative genetic models for X. index tolerance are considered. The simplest method involves one gene, with tolerance being dominant. In a second model, tolerance is governed by two genes, either of which can condition tolerance. In one gene, tolerance is dominant, and in the other it is recessive. Studies to further elucidate the basis of X. index tolerance are proposed, and the relevance of these findings to grape breeding programs is discussed.