Phenology, productivity, and chemical characterization of Jatropha curcas L. as tool for selecting non-toxic elite germplasm

Abstract

A phenological, physical and chemical descriptive study was carried out on six germplasms of Jatropha curcas L. collected from different areas of Mexico. From these six germplasms, elite germplasms that are better adaptable, with high seed, oil and protein yield, and low levels of phorbol esters were identified. The thermal constant (2570 ± 9) and seed weight (0.695 ± 0.065 g) were similar in all the six germplasms. The average plant height was 1.47 ± 0.25 m after one year of evaluation. Variation in the number of inflorescences (0 to 22) and seed yield (27.35 ± 22.65 g) per plant, and fruit per cluster (2.9 ± 2.2) was considerable. Kernel oil and crude protein contents were 57 ± 3% and 26 ± 2%, respectively. Germplasms India and Isla (Veracruz) had the highest levels of phorbol esters (5.982 and 2.070 mg·g-1, respectively). The reproductive stage and phorbol esters content were critical in selecting elite germplasms. Based on our results, we were able to select three elite germplasms.

Key words: Jatropha curcas, elite germplasm, accumulated degree days (ADD), yield, oil, protein, phorbol esters.