Resumo

NOLASCO-GUZMAN, Vicente et al. Experimental evaluation of seed germination and emergence in purging nut from Totonacapan. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.8, pp.1959-1971. ISSN 2007-0934.

Purging nut, Jatropha curcas L. (Euphorbiaceae) has different purposes: food, medicine, stake, shade and biofuels; despite the growing importance of the species worldwide, there is no accurate information relevant to its propagation. Aiming to evaluate: 1) germination; 2) emergence-time and percentage; 3) release of cotyledon leaves; and 4) seedlings type ten days after sowing (DAS); seeds from six accessions belonging to six elevation layers (191, 347, 542, 545, 610 and 630 masl), at three temperature (25, 30 and 35 °C) and two testa conditions (with and without) were used. At 30 °C germination occurred in 3.8 days, in accession A-630 masl germination, emergence and leave release was rapid (3.6, 4.6 and 7.4 days), while the highest percentage in the indicated variables was in A-347 (97.7, 96.3, 95.5%) and larger seedlings (16.7 cm) also to A-630, compared with other temperature and accessions collected in other elevations. Regarding to testa, germination, emergence and leave release occurred faster (3.8, 5.5 and 7.8 days) when removed; however, the highest germination percentage was in seeds with testa (88.5%). The results provide useful information to define technology leading to improve agronomic criteria for efficient cultivation.

Palavras-chave : Jatropha curcas; biofuel; emergence; germination; initial growth.

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