Effect of Seedling Age, Environmental Temperature, and Foliar Total Glycoalkaloids on Resistance of Five Solanum Genotypes to the Potato Leafhopper

Tipo de material: Texto

TextoSeries ; Environmental Entomology, 8, p.690-693, 1979Trabajos contenidos:

Van De Klashorst, Gerrit
Tingey, Ward M

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Resumen: Potato seedlings were evaluated at 2, 3, and 4 wk of age for resistance to Empoascafabae (Harris)using glasshouse methods. The relative resistance rankings of seedling-stage plants, as measured by nymphal survival and plant injury, were similar to those obtained by field assessment of mature plants in earlier studies. Resistance of the wild, diploid species, Solanum pampasense Hawkes, was detectable in seedlings as young as 2 wk of age. Depending on the growth stage, foliage of S. pampasense seedlings contained 3-14 times the levels of total glycoalkaloids as that of the susceptible cultivar, 'Katahdin', suggesti ng involvement of these steroidal glycosides in potato leafhopper resistance. For mature plants, use of a fluctuating 25°/15°C temperature regime provided a wider range in expression of resistance between clones than did a constant 25°C regime.

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Potato seedlings were evaluated at 2, 3, and 4 wk of age for resistance to Empoascafabae (Harris)using glasshouse methods. The relative resistance rankings of seedling-stage plants, as measured by nymphal survival and plant injury, were similar to those obtained by field assessment of mature plants in earlier studies. Resistance of the wild, diploid species, Solanum pampasense Hawkes, was detectable in seedlings as young as 2 wk of age. Depending on the growth stage, foliage of S. pampasense seedlings contained 3-14 times the levels of total glycoalkaloids as that of the susceptible cultivar, 'Katahdin', suggesti ng involvement of these steroidal glycosides in potato leafhopper resistance. For mature plants, use of a fluctuating 25°/15°C temperature regime provided a wider range in expression of resistance between clones than did a constant 25°C regime.

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