Effects of silicon on the growth and genetic stability of passion fruit/Silicio no crescimento e estabilidade genetica de plantas de maracujazeiro

• Published in: Acta scientiarum. Agronomy p. 503
• Main Authors: Costa, Barbara Nogueira Souza, Dias, Gabrielen de Maria Gomes, Costa, Irton de Jesus Silva, de Assis, Franscinely Aparecida, da Silveira, Flavia Aparecida, Pasqual, Moacir
• Format: Journal Article
• Language: Spanish
• Published: Universidade Estadual de Maringa 01-10-2016
• ISSN: 1679-9275
• DOI: 10.4025/actasciagron.v38i4.30939

The objective of this study was to determine the Silicon concentration that would provide good growth in passion fruit plants. Passion fruit seeds were sown in polystyrene. After 60 days, when they were approximately 15 cm tall, the plants were transplanted into polyethylene pots containing 1.1 kg Tropstrato® substrate. Treatments consisted of four concentrations (0, 0.28, 0.55, and 0.83 g [pot.sup.-1]) of silicon applied as a silicic acid solution 1%. This solution was applied around the stem of the plants (drenched), with the first application being administered 15 days after transplanting. In total, three applications were made at intervals of 15 days. After the last application, the plants were subjected to chemical analysis to determine the silicon concentration and to X-ray microanalysis and flow cytometry. Phytotechnical analyses were performed during the applications. The use of silicon in concentrations of 0.28 and 0.55 g [pot.sup.-1] provides better growth of the passion fruit, and the absorption and deposition of the silicon in the passion fruit leaves are proportional to the availability of this element in the plant. The roots of the passion fruit plant are silicon accumulators, and the DNA stability and amount are preserved in the silicon-treated passion fruit plants. Keywords: flow cytometry, silicic acid, Passiflora edulis. O objetivo foi determinar uma concentracao de silicio que proporcionasse um bom crescimento de plantas de maracuja. Sementes de maracujazeiro foram semeadas em bandejas de poliestireno, apos 60 dias, as plantas com aproximadamente 15 cm de altura, foram transplantadas para vasos de polietileno contendo 1,1 kg de substrato Tropstrato®. Os tratamentos consistiram de quatro concentracoes (0; 0,28; 0,55 e 0,83 g [vaso.sup.-1]) de silicio, na forma de solucao de acido silicico a 1%. Esta solucao foi aplicada ao redor do caule das plantas (drench), sendo a primeira aplicacao realizada 15 dias apos o transplantio das plantas. No total, foram realizadas tres aplicacoes, em intervalos de 15 dias. Apos a ultima aplicacao, as plantas foram submetidas a analise quimica de concentracao de silicio, microanalise de raios-X e citometria de fluxo. As analises fitotecnicas foram realizadas no decorrer das aplicacoes. O uso do silicio nas concentracoes 0,28 e 0,55 g [vaso.sup.-1], proporciona melhor crescimento das plantas de maracujazeiro, a absorcao de silicio e sua deposicao nas folhas de maracujazeiro sao proporcionais a disponibilidade desse elemento para a planta, o maracujazeiro e uma planta acumuladora de silicio nas raizes e a estabilidade da quantidade de DNA e preservada nas plantas de maracujazeiro tratadas com silicio. Palavras-chave: citometria de fluxo, acido silicico, Passiflora edulis.