Seed physiological quality and seedling growth of pea under water and salt stress/Qualidade fisiologica de sementes e crescimento de plantulas de ervilha sob estresse hidrico e salino

• Published in: Revista brasileira de engenharia agrícola e ambiental 2020-02, Vol.24 (2), p.95
• Main Authors: Pereira, Isabella C, Catao, Hugo C.R.M, Caixeta, Franciele
• Format: Article
• Language: Spanish
• Subjects: Chlorides; Germination; Glycols (Class of compounds); Growth; Halides; Legumes; Pea; Physiological aspects; Polyethylene glycol; Polyols; Prejudice; Seeds; Sodium chloride; Water
• ISSN: 1415-4366
• DOI: 10.1590/1807-1929/agriambi.v24n2p95-100

The aim of this study was to evaluate seed physiological quality and initial pea (Pisum sativum) seedling development at different water and salt potentials. Polyethylene glycol 6000, sodium chloride and potassium chloride solutions with different osmotic potentials (0; -0.2; -0.4; -0.6; -0.8; -1.0, and -1.2 MPa) were used, and the experiment had a 3 * 7 factorial arrangement. The physiological quality and initial seedling growth characteristics (first germination count, final germination count, strong normal seedlings, epicotyl and taproot lengths, epicotyl dry matter, and root dry matter) were evaluated in a completely randomized experimental design, with four repetitions. Decreases in the observed variables showed that the simulated stress conditions negatively affected physiological performance, germination and initial seedling growth. The water and salt stresses induced by the sodium chloride and potassium chloride solutions were greater than the stress induced by polyethylene glycol 6000. Key words: Pisum sativum, vegetable, polyethylene glycol, osmotic potential Objetivou-se avaliar a qualidade fisiologica das sementes e o crescimento inicial de plantulas de ervilha sob efeito de diferentes potenciais hidricos e salinos. Foram utilizadas solucoes de polietilenoglicol 6000, cloreto de sodio e cloreto de potassio com diferentes potenciais osmoticos (0; -0.2; -0.4; -0.6; -0.8; -1.0 and -1.2 MPa), sendo o experimento conduzido em esquema fatorial 3 * 7. Nos efeitos dos tratamentos, avaliou-se a qualidade fisiologica e o crescimento inicial das plantulas (primeira contagem e contagem final de germinacao, plantulas normais fortes, comprimentos do epicotilo e da raiz primaria, massa seca do epicotilo e massa seca das raizes), em delineamento experimental inteiramente ao acaso, com quatro repeticoes. As simulacoes das condicoes de estresse prejudicaram o desempenho fisiologico e permitiram a constatacao dos efeitos do estresse na germinacao e no crescimento inicial das plantulas pelo decrescimo das variaveis observadas. Os estresses hidrico e salino induzidos pelas solucoes cloreto de sodio e cloreto de potassio foram mais drasticos do que o induzido por polietilenoglicol 6000. Palavras-chave: Pisum sativum, hortalica, polietilenoglicol, potencial osmotico