Estiarte M, Filella I, Serra J, Peñuelas J
Centre de Cabrils, Ctra. de Cabrils s/n, Institut de Recerca i Tecnologia Agroalimentàries, 08348, Cabrils (Barcelona), Spain.
Oecologia. 1994 Sep;99(3-4):387-391. doi: 10.1007/BF00627753.
Pepper plants were grown under different water and nitrogen availabilities that produced severe nitrogen limitations and mild water stress. Nitrogen limitation produced lower leaf N content, higher C:N, and higher leaf content of phenolic compounds, in consonance with the carbon/nutrient balance hypothesis. Nitrogen limitation also produced lower nutritional quality of leaves, with lower relative growth rates and lower efficiency of conversion of ingested biomass on the polyphagous herbivoreHelicoverpa armigera. The biomass gained per gram nitrogen ingested also tended to be lower in those insects feeding on nitrogen-limited plants, in parallel with their higher phenolic content. However, larvae fed on nitrogen-limited plants did not increase the ingestion of food to compensate for the N deficiency of leaves. The mild water stress, which only slightly tended to increase the phenolic content of pepper leaves, had no significant effect on nutritional indices.
辣椒植株在不同的水分和氮素供应条件下生长，这些条件导致了严重的氮素限制和轻度的水分胁迫。根据碳/养分平衡假说，氮素限制导致叶片氮含量降低、碳氮比升高以及酚类化合物的叶片含量增加。氮素限制还导致叶片营养质量下降，多食性害虫棉铃虫的相对生长率降低，摄入生物量的转化效率也降低。以氮素受限植物为食的昆虫，每摄入一克氮所获得的生物量也往往较低，这与其较高的酚类含量相一致。然而，以氮素受限植物为食的幼虫并没有增加食物摄入量来弥补叶片的氮素不足。轻度水分胁迫仅略微倾向于增加辣椒叶片的酚类含量，对营养指标没有显著影响。
