Variabilidad intraespecie y efecto del nitrógeno sobre rendimiento de fruto seco en Karwinskia parvifolia Rose Intraspecific variability and nitrogen effects on dry fruit yield in Karwinskia parvifolia Rose

Palabras clave: Peroxisomicina A1; Karwinskia parvifolia; Karwinskia humboldtiana; Estructuras secretorias; Domesticacion. Abstract. 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 effect of nitrogen was evaluated on its dry fruit yield. The experiment was carried out using a crossover design, two treatment sequences and two production cycles. Col- lected 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). Ra- tios 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 effects of plants and production cycles on DFY, DFW and DWE. These results in - dicate the existence of variability among plants for fruit yield in the study species.