Resumo

LUJAN-RANGEL, R et al. Intraspecific variability and nitrogen efects on dry fruit yield in Karwinskia parvifolia Rose. Phyton (B. Aires) [online]. 2012, vol.81, n.2, pp.247-253. ISSN 1851-5657.

Karwinskia parvifolia Rose synthesizes a toxin (PA1), which might be used to treat some types of tumors. Variability from 16 plants of K. parvifolia and the efect of nitrogen was evaluated on its dry fruit yield. Te experiment was carried out using a crossover design, two treatment sequences and two production cycles. Collected data were: dry fruit yield (DFY), dry fruit weight (DFW) and dry endocarp weight (DWE) per plant. During Cycle 1, the group of plants that received additional nitrogen (CN) produced higher yields than the group that received no additional nitrogen (SN). Ratios of CN/SN were 1.68 (DFY), 1.43 (DFW) and 1.18 (DWE). In Cycle 2, we obtained reversed values: ratios of CN/SN were 0.85 (DFY), 0.82 (DFW) and 0.87 (DWE). In both production cycles, yields were greater in the CN-SN than in the SN-CN sequences. Analysis of variance showed statistically significant efects of plants and production cycles on DFY, DFW and DWE. These results indicate the existence of variability among plants for fruit yield in the study species.

Palavras-chave : Peroxisomicine A1; Karwinskia parvifolia; Karwinskia humboldtiana; Secretory structures; Domestication.

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