Salicylic acid in the physiological priming of onion seeds subjected to water and salt stresses

Abstract

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.

Phytohormones on the germination and initial growth of pumpkin seedlings under different types of water

“…Application of the regulators did not hamper root dry mass under non-saline conditions. However, in other species, such as Allium cepa L., the physiological priming of seeds with 50 μM of salicylic acid promoted an increase in root dry mass (Silva et al, 2019).…”

“…To minimize the negative effects of abiotic stresses during germination and initial growth of seedlings, seeds have been treated with phytohormones. Among the most used are those with gibberellic acid (Kandil et al, 2014) and salicylic acid (Silva et al, 2019).…”

Ácido salicílico atenua o efeito do estresse hídrico na germinação e crescimento inicial de plântulas de <i>Cereus jamacaru</i> DC

“…Tal resposta está associada a capacidade do AS reduzir os danos nos tecidos internos da semente em condições de estresse. O AS atua como indutor do sistema antioxidante de defesa vegetal, pode estar associado a ocorrência do ajuste osmótico das sementes ao déficit hídrico, proporcionando o aumento no crescimento das plântulas A. cepa [24]. Os valores de massa fresca nas plântulas de C. jamacaru se ajustaram ao modelo linear decrescente à medida que reduziu o potencial osmótico do substrato, atingindo perdas de 9,89% ao comparar os valores do tratamento controle com o menor potencial de -1,2 MPa (Figura 2B).…”

“…obtiveram aumento na germinação de feijão-caupi (Vigna unguiculata L. Walp) em condições de déficit hídrico induzido. Silva et al (2019)[24] com a dose de 50 µM de ácido salicílico obtiveram aumento na germinação e no vigor de sementes de cebola (Allium cepa L.) sob estresse salino e hídrico.…”

Salicylic Acid as an Attenuator of Salt Stress in Soursop

“…Thus, it is necessary to seek strategies that enable the cultivation of soursop, and these alternatives particularly include the use of elicitors, such as salicylic acid, which acts in improving the efficiency of metabolic processes, resulting in acclimation to abiotic stresses, including salt and water stresses (SILVA et al, 2019;ANDRADE et al, 2020).…”