Effect of saline water and shading on dragon fruit ('pitaya') seedling growth/Efeito da agua salina e sombreamento no crescimento de mudas de 'pitaya'.

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Publisher: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
Document Type: Article
Length: 3,584 words

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HIGHLIGHTS: The protected environment under 50% shade with black net is an alternative for the production of 'pitaya' seedlings. The full sun environment mitigated the salt stress on the biomass of the aerial part of 'pitaya' seedlings. Saline stress affected plant height, number of secondary shoots and root length of 'pitaya' seedling. 'Pitaya (Hylocereus undatus) is a fruit-bearing, climbing cactus with great food potential for the semiarid region. This study aimed to evaluate the production of 'pitaya' seedlings irrigated with low and high salinity water and grown in different light intensities. The experiment was conducted in a completely randomized design, in a 2*2 factorial arrangement, with two electrical conductivities of irrigation water: [S.sub.1]- 0.3 dS [m.sup.-1] (low salinity) and [S.sub.2] - 5.0 dS nr (1) (moderate salinity) in two environments: [A.sub.1]- black net with 50% shading, and [A.sub.2] - full sun, with ten replicates. The variables evaluated were plant height, main cladode diameter, above-ground biomass, root biomass, total plant biomass, number of secondary cladodes, root length, and length of secondary cladodes. The 50% shading (black net) promoted higher plant height, number of secondary shoots, and root length of the 'pitaya' plants. The irrigation with moderate saline water (5.0 dS [m.sup.-1]) reduced the number of secondary cladodes, length of root, and length of secondary cladodes. The 'pitaya' seedlings grown under 50% shading (black net) showed greater root dry biomass when irrigated with low-salinity water. Greater values of diameter of the primary cladode, above-ground dry biomass, and total dry biomass were observed under full sunlight and elevated saline stress. Key words: Hylocereus undatus, salinity, protected environment Pitaya' (Hylocereus undatus) e um cacto trepador, frutifera com grande potencial de alimento para regiao semiarida. Objetivou-se avaliar a producao de mudas de 'pitaya' irrigadas com agua de baixa e alta salinidade e cultivadas em diferentes tipos de ambientes. O experimento foi conduzido em delineamento experimental inteiramente casualizado, em esquema fatorial 2*2, sendo duas condutividades eletricas da agua de irrigacao: [S.sub.1] - 0,3 dS [m.sup.-1] (baixa salinidade) e [S.sub.2]- 5,0 dS [m.sup.-1] (salinidade moderada), em dois ambientes: [A.sub.1] - telado preto com 50% de sombreamento e [A.sub.2] - pleno sol, com 10 repeticoes. As variaveis analisadas foram: altura da planta, diametro do caule principal, massa seca da parte aerea, massa seca da raiz, massa seca total da planta, numero de brotos secundarios, comprimento de raiz e comprimento dos brotos secundarios. O telado preto com 50% de sombreamento proporcionou maior altura de planta, numero de brotos secundarios e comprimento de raiz de plantas de 'pitaya'. A irrigacao com agua de salinidade moderada (5,0 dS m ) reduz o numero de brotos secundarios, e comprimento da raiz e dos cladodios secundarios. As mudas de 'pitaya' cultivadas sob 50% de sombreamento (telado preto) apresentaram maior biomassa seca de raiz quando irrigadas com agua de baixa salinidade. Foram observados maiores valores do diametro do cladodio primario, da biomassa seca acima do solo e da biomassa seca total sob luz plena do sol e elevado estresse salino. Palavras-chave: Hylocereus undatus, salinidade, ambiente protegido

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Gale Document Number: GALE|A662090029