Abstract
Controlled environment experiments were used to determine the effect of light intensity on levels of glycoalkaloids and resistance to the Colorado potato beetle (CPB),Leptinotarsa decemlineata Say, inSolanum chacoense Bitter clones that synthesized acetylated glycoalkaloids, the leptines. Plants were grown under two light intensities, 50 or 250 ώmol m-2S-1, and bioassayed for CPB resistance by placing neonate larvae on excised foliage. Larval development stage and mortality were recorded after four days. The leptine-synthesizing clones responded to the increase in light intensity with a 2–4 fold increase in level of foliar leptines. Larval development rate on foliage from plants grown under high light intensity was reduced and larval mortality increased. Results showed a significant (p>0.05) effect of light on glycoalkaloid synthesis and CPB resistance.
Compendio
Se realizaron experimentos de ambiente controlado para determinar el efecto de la intensidad de la luz sobre los niveles de glicoalcaloides y la resistencia al escarabajo de la papa de Colorado (EPC),Leptinotarsa decemlineata Say, en clones deSolanum chacoense Bitter que sintetizan glicoalcaloides acetilados, las leptinas. Se mantuvo plantas bajo dos intensidades de luz, 50 o 250 ώmol m−2s−1, y se probaron para resistencia al EPC colocando larvas recién emergidas sobre follaje extirpado. Se registraron el estado de desarrollo de las larvas y su mortalidad después de cuatro días. Los clones sintetizadores de leptina respondieron al incremento en la intensidad luminosa con un aumento de 2 a 4 veces en el nivel de leptinas en las hojas. La tasa de desarrollo de las larvas sobre el follaje de plantas que crecieron bajo una alta intensidad luminosa fue reducida, pero la mortalidad de las larvas se incrementó. Los resultados muestran un efecto significativo (p>0,05) de la luz sobre la síntesis de glicoalcaloides y sobre la resistencia al EPC.
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Deahl, K.L., Cantelo, W.W., Sinden, S.L. et al. The effect of light intensity on Colorado potato beetle resistance and foliar glycoalkaloid concentration of fourSolanum chacoense clones. American Potato Journal 68, 659–666 (1991). https://doi.org/10.1007/BF02853741
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DOI: https://doi.org/10.1007/BF02853741