strategies for tomato seedlings production using paclobutrazol
estratégias para produção de mudas de tomateiro utilizando paclobutrazol

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ID: 155079
2013
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Abstract
The modern tomato production, either for fruit table production or for processing, has required quality seedlings, able to withstand environmental adversities after planting and maintaining the standard genotype productive. The aim of this study was to evaluate the effect of three concentrations of PBZ (0, 50 and 100 mg L-1) and two methods of application (seed treatment and watering seedlings) on seedling emergence and seedling production of tomato growth indeterminate. We adopted a completely randomized in a 2x3 factorial scheme with four replications. We evaluated the seedling emergence, the rate of speed of emergence, seedling height and diameter of hypocotyl and their absolute growth rate (TCA), leaf area, dry weight of shoots, roots and total, and reason leaf area (RAF). Results were subjected to analysis of variance and the mean levels of the factor “methods of application” compared by Tukey test at 5% and the mean levels of the factor “concentrations” subjected to regression analysis. The application of paclobutrazol via seedlings watering did not affect seedling emergence, significantly reduced the rate of seedling growth and, consequently, the size of the seedlings without affecting the diameter of hypocotyl, plus allow accumulation of dry roots. A concentration of 50 mg L-1 was shown to be sufficient to obtain seedlings more compact, subject to leaf area, the application via watering, beyond allowing an increase of about 37% in dry weight of roots.

A tomaticultura moderna, de mesa ou para processamento industrial, demanda mudas de qualidade, capazes de resistir às adversidades ambientais após o plantio e que mantenham o padrão produtivo do genótipo. O objetivo deste trabalho foi avaliar o efeito de três concentrações de PBZ (0, 50 e 100 mg L-1) e dois métodos de aplicação (tratamento de sementes e rega de plântulas) na emergência de plântulas e produção de mudas de tomateiro de crescimento indeterminado. Adotou-se o delineamento inteiramente casualizado, em esquema fatorial 2x3, com quatro repetições. Foi avaliada a emergência de plântulas, o índice de velocidade de emergência, altura de plântulas e diâmetro do caulículo e suas respectivas taxas de crescimento absoluto (TCA), área foliar, massa de matéria seca da parte aérea, das raízes e total, e razão de área foliar (RAF). Os dados foram submetidos a analise de variância e as médias dos níveis do fator “métodos de aplicação” comparadas pelo teste de Tukey, a 5% e as médias dos níveis do fator “concentrações” submetidas à análise de regressão. A aplicação de paclobutrazol via rega de plântulas não comprometeu a emergência de plântulas, reduziu significativamente a taxa de crescimento das plântulas e, conseqüentemente, o porte das mudas, sem afetar o diâmetro do caulículo, além de permitir acúmulo de matéria seca de raízes. A concentração de 50 mg L-1 mostrou-se suficiente para obtenção de plântulas mais compactas, sem prejuízo à área foliar, na aplicação via rega, além de permitir um incremento de cerca de 37% na massa de matéria seca de raízes.

Reference Key
seleguini2013semina:strategies Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Alexsander Seleguini;Max José de Araujo Faria Júnior;Katiane Santiago da Silva Benett;Odair Lacerda Lemos;Shizuo Seno
Journal frontiers in neuroendocrinology
Year 2013
DOI
10.5433/1679-0359.2013v34n2p539
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/9321
Keywords
estiolamento de mudasagriculture (general)

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