RESUMO
Salinization occurring through irrigation on arable land has been a growing concern worldwide. This study aimed to evaluate the germination and initial development of common rue subjected to different saline concentrations. Two salts (sodium chloride and calcium chloride) and five saline concentrations (zero, -0.1, -0.2, -0.3, and -0.4 MPa) were utilized. Germination tests, first germination count, seedling length and dry weight were employed to assess seed responses to the studied variations. Based on the results, the excess of salt reduces the germination percentage and the initial development of common rue seedlings, regardless of the substance used for stress induction.
A salinização, devido à irrigação em terras cultiváveis, tem sido uma preocupação crescente em todo mundo. Diante disso, objetivou-se com este trabalho avaliar a germinação e o crescimento inicial de arruda submetida a diferentes concentrações salinas. Foram utilizados dois sais (cloreto de sódio e cloreto de cálcio) e cinco concentrações salinas (zero, -0,1; -0,2; -0,3 e -0,4 MPa). As respostas das sementes a essas variações foram avaliadas pelos testes de germinação, primeira contagem de germinação, além do comprimento e massa seca das plântulas. De acordo com os resultados, o excesso de sais reduz a percentagem de germinação e o desenvolvimento inicial das plântulas de arruda, independente da substância utilizada para indução do estresse.
RESUMO
In recent years, there has been a growing concern related to soil and water contamination due to the constant dispersal of toxic metals. In addition to their ecotoxicological potential, these elements exhibit a cumulative character that favors their permanence in soil and passage to living organisms, which can lead to an ecological imbalance. Among toxic metals, cadmium (Cd) is an obstacle to agriculture because it can adversely affect food quality and human health, as well as diminish plant growth and productivity. Thus, the objective of this work was to evaluate the toxicity of cadmium on seed germination and initial growth of chia. The ecotoxicological effects of four Cd concentrations (15; 30; 45; and 60 mg L-1) were evaluated. The response variables were germination percentage, first count, germination speed index, total length, shoot length, root length, seedling dry mass, and tolerance index. It is concluded that the presence and accumulation of Cd in the culture substrate played an inhibitory role in seed germination and initial seedling growth of chia starting at 15 mg L-1. On the other hand, no significant effect was observed for the treatments in relation to dry mass of the chia seedlings.
