Feasibility in seed germination of Hypericum perforatum L. submitted at different temperatures and treatments with high dilutions

Abstract

Background: Hypericum perforatum is used as a medicinal plant, mostly in antidepressant treatment. With endogenous and exogenous dormancy, more studies about the germination of the seeds are necessary. Aim: To evaluate the effect of temperature and of preparations of high dilutions on the germination of seeds of Hypericum perforatum. Methodology: Three bioassays were carried out in chambers of germination, using a completely randomized experimental design and in duplicate. In the first bioassay, of temperatures of 20, 25 and 30 ºC was evaluated, with 20 replicates and 50 seeds in each replicate. In the second, the effect of high dilutions (Kali carbonicum, Natrum muriaticum, Phosphorus and Silicea terra in 12cH) using 4 replicates with 50 seeds each. In the third, Kali carbonicum was tested at 6, 12, 20, 30cH with 50 seeds and 4 replicates. The percentage of germination, germination rate index (GRI), average germination time (AGT) and seedlings with cotyledons. The data were analyzed through the R software at a 5% significance. Results: At the temperature of 25 °C, 63% of the seeds germinated while at the temperatures of 20 and 30 °C the percentage was 26% and 18%, respectively. In seeds treated with Kali carbonicum 12cH the germination rate increased significantly in relation to the control group. Kali carbonicum 6cH increased the GRI of the seeds, while at 20cH, it increased the AGT, showing delay in germination. Conclusion: The use of the Kali carbonicum assists in the breakage of dormancy and average time of germination in Hypericum perforatum seeds.

Viabilidade E Vigor De Sementes De Arroz De Cultivo Manejado Com Preparados Homeopáticos

“…A diferença significativa na porcentagem de germinação, bem como o TMG superior observado nas sementes colhidas em parcelas onde não foram realizados manejos fitossanitários, demonstra que a utilização de tratamentos pode influenciar no tempo de germinação das sementes, o que consequentemente poderá comprometer a viabilidade destes. Pesquisas tem demonstrado que a homeopatia tem se mostrado como um substituto nos cultivos sem afetar a viabilidade e vigor de sementes ou até mesmo potencializando crescimento e atividade fotossintética das plântulas (PANDA;MOHANTY;DHAL, 2013;NUNES et al, 2019). O que se difere de sementes que apresentam resíduos de agrotóxicos, pois essa toxicidade influencia diretamente na liberação de radicais de oxigênio, que leva a planta a produzir mecanismos de defesa, refletindo em condições de estresse da planta, podendo levar a diminuição do potencial das sementes (MILOŠEVIĆ; VUJAKOVIĆ; KARAGIĆ, 2010).…”