RESUMOOs reguladores de crescimento podem influenciar na qualidade fisiológica das sementes assim como na atividade de enzimas envolvidas na germinação. Podem ainda apresentar em suas formulações micronutrientes que atuam principalmente como catalisadores de enzimas. ABSTRACTGrowth regulators can influence the physiological quality of seeds as well as the activity of enzymes involved in germination. They may, further, present in their formulation micronutrients which act mainly as enzyme catalysts. In this research work, hybrid corn seeds of the cultivar GNZ 2004 and line Le 57 were treated with the following biostimulants and dosages: 1.Stimulate ® 12.5mL/kg of seed, 2.Cellerate ® 10,0mL/kg, 3.mixtue of Cellerate ® + Stimulate ® (10.0mL/kg + 12.5 mL/kg), 4.Booster ® 100 mL/20kg and 5.control. Soon after the treatment, the seeds were submitted to the tests of germination, accelerated ageing and cold and seedling emergence tests. In addition, mass of dry matter of seedlings, shoot and roots and the activities of the enzymes á-amylase, catalase, esterase and peroxidase were evaluated. In the biostimulant treated seeds, there were no improvements in the quality of seeds and under stressful conditions, the use of the biostimulants Stimulate ® +Cellerate ® and Cellerate ® reduced the physiological quality of corn seeds. Increased activity of the peroxidase enzyme was found in seeds treated with Stimulate ® , Cellerate ® and Stimulate ® +Cellerate ® . Increased activity of the enzyme esterase was observed in seeds treated with Stimulate ® + Cellerate ® pointing out phytotoxicity of them. INTRODUÇÃONovas tecnologias têm sido empregadas visando incremento na produção da cultura do milho, incluindo o uso crescente de sementes melhoradas associado à aplicação via semente de fungicidas, herbicidas e reguladores de crescimento. A qualidade da semente é alcançada durante o processo de produção, devendo ser conservada até o momento da semeadura, garantindo um alto potencial de emergência de plântulas em campo e ganho em produtividade.A aplicação de reguladores de crescimento via semente tem sido proposta por várias empresas. Esses reguladores são definidos como substâncias naturais ou sintéticas que podem ser aplicadas diretamente nas plantas, em sementes e no solo, com a finalidade de incrementar a produção e melhorar a qualidade de sementes. Entre as
Salvia hispanica cultivation is recent in Brazil and occurs in the off-season, when there is lower water availability in the soil. Water deficit is one of the abiotic factors that most limit germination for compromising the sequence of metabolic events that culminate with seedling emergence. Several attenuating substances have been used to mitigate the effects resulting from this stress and give higher tolerance to the species. Thus, the objective of this study was to evaluate the action of different agents as water stress attenuators in the germination and accumulation of organic compounds in S. hispanica seedlings. The treatments consisted of pre-soaking the seeds for 4 hours in salicylic acid (1 mM.L-1), gibberellic acid (0.4 mM.L-1), distilled water and control treatment (without soaking). The seeds were germinated at osmotic potentials of 0.0, -0.1, -0.2, -0.3 and -0.4 MPa, using PEG 6000 as an osmotic agent. The variables germination percentage, germination speed index, shoot and primary root lengths, total dry mass, proline, total soluble sugars and total free amino acids were analyzed. Salicylic acid and gibberellic acid led to the best results among the attenuators tested, increasing germination, length, dry mass and biochemical components of S. hispanica seedlings under water deficit. Therefore, salicylic and gibberellic acids are efficient in mitigating water stress in S. hispanica seeds up to the potential of -0.4 MPa.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.