Duration of germination test of Parapiptadenia blanchetii (Benth.) Vaz and M. P. Lima

• Published in: Comunicata Scientiae Vol. 14; pp. 1 - 7
• Main Authors: de Souza, Edimara Ribeiro, de Souza, Manuela Oliveira, Santos, Jiovana Pereira Amorim, Carvalho, Edvdnia da Silva, Mendonça, Andrea Vita Reis
• Format: Journal Article
• Language: English
• Published: Bom Jesus Comunicata Scientiae 01.01.2023
• Subjects: Criteria; Duration; Experiments; Geographical distribution; Germination; Laboratories; Native species; Plateaus; Regression analysis; Regression models; Seedlings; Seeds; Taxonomy; Temperature; Tests; Brazil
• ISSN: 2179-9079; 2177-5133
• DOI: 10.14295/CS.v14.3997

Germination tests are essential tools in the characterization of seed lots. However, there is no recommendation for conducting the germination test for Parapiptadenia blanchetii (Benth.). The information about the species is limited to taxonomic studies and distribution area. The present study aimed to determine a criterion for the duration of the germination test of P. blanchetii seeds, with greater speed and efficiency, at different temperatures. The experiment was carried out at temperatures of 20, 25, 30 and 35°C, with four replications of 25 seeds. The germination curve was fitted by plateau-response regression models: segmented linear with plateau (LPM) and segmented quadratic with plateau (QPM). For germination, the QPM showed the best fit at 20°C and 25°C. However, at temperatures of 30°C and 35°C the performance of the two models was similar. For the formation of normal seedlings, the best fit of the data was obtained with QPM at temperatures of 25°C and 30°C, for the other temperatures the LPM showed better performance. The duration of germination tests depends on the germination criterion and on the temperature. For germination tests conducted at temperatures of 30°C or 35°C, for the criterion of root protrusion, a single count on the fourth day after sowing is recommended. To assess the formation of normal seedlings, performing first and second count, at six and nine days, is suggested.