This study aimed to evaluate the effect of physiological priming with salicylic acid on the mitigation of water and salt stresses on onion (Allium cepa L.) seeds. For this, seeds of onion, cultivar IPA 11, were soaked in salicylic acid solution (50 µM) for 24 h and placed to germinate at different water and saline potentials. For water stress, the experiment was conducted in a completely randomized design, in a 2 x 5 factorial scheme (salicylic acid with 0 and 50 µM and osmotic potentials of 0, -0.1, -0.2, -0.3, -0.4 MPa induced by polyethylene glycol 6000), with four repetitions of 50 seeds per plot. In salt stress, the adopted experimental design was completely randomized, with treatments distributed in a 2 x 4 factorial scheme (salicylic acid at concentrations of 0 and 50 µM and the osmotic potentials of 0, -0.3, -0.6 and -0.9 MPa induced by NaCl), in four repetitions of 50 seeds. For both experiments, germination, growth and accumulation of organic solutes were evaluated. Salicylic acid did not stimulate the germination of onion seeds in the absence of stress, but the application of 50 µM of salicylic acid increased the germination speed, growth and dry matter accumulation under conditions of water and salt stress. Onion plants were efficient in performing osmotic adjustment up to the potentials of -0.2 MPa induced by PEG 6000 under water stress and of -0.4 MPa induced by NaCl under salt stress.
A B S T R A C TThe limited access and the scarcity of good quality water for agriculture are some of the major problems faced in agricultural areas, particularly in arid and semiarid regions. The aim of this study was to evaluate the quality of watermelon seedlings (cv. Crimson Sweet), irrigated with different concentrations of biosaline water of fish culture. The experimental design was completely randomized with five treatments, corresponding to biosaline water at different concentrations (0, 33, 50, 67 and 100%), and four replicates of 108 seedlings. Watermelon seeds were sown in plastic trays filled with commercial substrate and irrigated with different solutions of biosaline water. Seedlings were harvested for biometric analysis at 14, 21 and 28 days after sowing. The use of biosaline water did not affect emergence and establishment of seedlings until 14 days after sowing, the period recommended for transplantation. However, the use of biosaline water affected the development of seedlings with longer exposure time.Desenvolvimento de mudas de melancia cv. Crimson Sweet em água biossalina R E S U M O A limitação ao acesso e a escassez de água de boa qualidade para a agricultura são alguns dos principais problemas enfrentados em áreas agrícolas principalmente em regiões áridas e semiáridas. Objetivou-se, neste trabalho, avaliar a qualidade das mudas de melancia cv. Crimson Sweet, irrigadas com diferentes concentrações de água biossalina de cultivo de peixe. O delineamento experimental foi inteiramente casualizado com cinco tratamentos correspondendo a soluções de água biossalina em diferentes concentrações (0, 33, 50, 67 e 100%) e quatro repetições, de 108 mudas. As sementes de melancia cv. Crimson Sweet foram semeadas em bandejas plásticas preenchidas com substrato comercial e irrigadas com as diferentes soluções de água biossalina. As mudas foram coletadas para realização das análises biométricas aos 14,21 e 28 dias após a semeadura. O uso de água biossalina não afetou a emergência nem o estabelecimento das plântulas até os 14 dias após a semeadura, período recomendado para o transplantio; entretanto, a utilização de água biossalina afetou o desenvolvimento de mudas com maior período de exposição.
Pumpkin (Curcubita moschata Duchesne) production in quantity and quality is often restricted due to adverse environmental conditions. Thus, the objective was to evaluate the action of phytohormones as stress attenuators on the germination and initial growth of pumpkin seedlings, cv. Sergipana, under different types of water. The design adopted was completely randomized, in a 3 × 4 factorial scheme, with four repetitions. In addition to the control, the seeds were treated with the gibberellic and salicylic acids and irrigated with the supply water, fish farming wastewater, artesian well water and solution of the mixture of fish farming wastewater + artesian well water, in a 1:1 ratio. The variables evaluated were germination, first germination count, germination speed index, length of shoots and roots, dry mass of shoots and roots, soluble sugars, amino acids and proline. Treatment of pumpkin seeds, cv. Sergipana, with gibberellic and salicylic acids improved germination kinetics and attenuated the effects of water salinity during the initial growth of pumpkin seedlings.
A nutrição mineral é fator determinante no enraizamento adventício, com envolvimento nas respostas morfogenéticas, processos bioquímicos e fisiológicos. A influência dos minerais sobre o sucesso do enraizamento apresenta correlação com o estado nutricional da planta matriz doadora, pois esta determina a quantidade de carboidratos, hormônios e outros compostos metabólicos essenciais para induzir o desenvolvimento radicular e vegetativo. Embora o enraizamento e a nutrição mineral estejam intimamente relacionados, poucos estudos têm sido divulgados visando à caracterização dos efeitos de nutrientes específicos. Neste contexto, realizou-se, com base em informações disponíveis na literatura, uma análise do papel de alguns nutrientes envolvidos na rizogênese adventícia de espécies cultivadas via propagação vegetativa. Com isso, é pertinente considerar que se o nutriente estiver envolvido nos processos metabólicos da planta e possibilitar a desdiferenciação para formação do meristema radicular, este é essencial para rizogênese. Dessa forma, infere-se que o nitrogênio, fósforo, zinco e boro são elementos necessários para algumas espécies durante o processo de propagação vegetativa por participarem diretamente do processo de enraizamento.
-Zephyranthes sylvatica is a beautiful lily, endemic from the Brazilian Caatinga. Although it has a great ornamental potential, little is known about this species, especially regarding its seeds germination process. Aiming to characterize the germination of Z. sylvatica seeds, we studied its imbibition curve, optimum temperature and substrate for germination and seedling emergence, osmotic and salt stress tolerance, as well as the tolerance to frosting/ defrosting, which indicates long term cryostorage potential. The germination of Z. sylvatica presents a triphasic model of imbibition, in which the primary root protrusion occurs after 72 hours of imbibition. The ideal conditions for evaluating seed germination of Z. sylvatica is 25 °C, in paper rolls. These seeds are highly tolerant to osmotic stress, but not to salt stress. Z. sylvatica seeds can be cryopreservated without loss of germination and seed vigor.Index terms: caatinga, lily, vigor, propagation.Caracterização da germinação de lírio-da-caatinga (Zephyranthes sylvatica (Mart.) Baker (Amarilidacea)RESUMO -Zephyranthes sylvatica é um lindo lírio, endêmico da Caatinga brasileira. Embora tenha um grande potencial ornamental, pouco se sabe sobre esta espécie, especialmente em relação ao processo germinativo de suas sementes. Visando caracterizar a germinação de sementes de Z. sylvatica, estudou-se a sua curva de embebição, temperatura e substrato ótimos para a germinação e emergência das plântulas, tolerância aos estresses osmótico e salino, assim como a tolerância ao congelamento / descongelamento que indica o potencial crioarmazenamento a longo prazo. Baseado nos dados obtidos pode-se concluir que a germinação de Z. sylvatica apresenta modelo trifásico de embebição, em que a protrusão da raiz ocorre após 72 horas de embebição. As condições ideais para a avaliação da germinação das sementes de Z. sylvatica é de 25 °C, em rolos de papel. Estas sementes são altamente tolerantes ao estresse osmótico, mas não ao estresse salino. Sementes de Z. sylvatica podem ser criopreservadas sem perda de germinação e vigor das sementes.Termos para indexação: caatinga, lírio, vigor, propagação.1
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.