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Abstract(s)
A síndrome de BER (“Blossom-End Rot”, podridão apical) é uma das causas de perdas de produção mais significativas em culturas horticolas como pepino, tomate e melão. Na empresa Ana Carvalho procurou-se minimizar este distúrbio fisiológico na cultivar Cândido da variedade tomate rosa enxertado em Tro141 cultivada em estufa, recorrendo à aplicação de diferentes reguladores de crescimento (paclobutrazol, prohexadiona-Ca e ácido abscísico) que inibem a fitohormona giberelina e avaliando-se o seu efeito na incidência de BER e no desempenho produtivo e económico da cultura. Foram realizadas aplicações semanais de 200 mL por regulador de crescimento: paclobutrazol (40 mg/L), prohexadiona-Ca (300 mg/L), ácido abscísico foliar (208 mg/L), ácido abscísico na rega com a mesma concentração e uma mistura de ácido abscísico (208 mg/L) com prohexadiona-Ca (300 mg/L). O grupo controlo (sem regulador aplicado) registou cerca de 11,06% de incidência de BER, o paclobutrazol reduziu a incidência de BER para 0%, aumentando a produção viável em 0,5 kg/planta, apesar de causar encurtamento dos entrenós. A combinação de prohexadiona-Ca e de ácido abscísico foliar reduziu a incidência de BER para 0,42%, aumentando aumentou a produção viável em 1,18 kg/planta. O ácido abscísico foliar reduziu a BER para 1,12%, aumentando a produção viável em 0,75 kg/planta. A aplicação via rega do ácido abscísico, embora aumentasse a produção total em 1,04 kg/planta e a produção viável em 1,16 kg/planta, foi menos eficaz na redução da BER (7,16%). A prohexadiona-Ca aplicada isoladamente, além de não ser economicamente viável, diminuiu a BER para 7,34% e reduziu a produção total em 1,2 kg/planta e a produção viável em 0,9 kg/planta. Os resultados indicam que as fitohormonas como antagonistas das giberelinas podem atuar na redução de BER, devendo a escolha do regulador de crescimento e sua forma de aplicação considerar a cultura, as condições ambientais e os objetivos de produção.
Blossom-End Rot (BER) is one of the main causes of production losses in various horticultural crops such as cucumber, tomato, and melon. Ana Carvalho company has dedicated to finding ways to minimize this physiological disorder in the 'Cândido' cultivar of pink tomato grafted onto Tro141 produced under greenhouse conditions. This study evaluated the effect of applying different growth regulators (paclobutrazol, prohexadione-Ca, and abscisic acid), which inhibit the phytohormone gibberellin, on the incidence of BER and on the productive, and economic performance of the crop. Weekly applications of 200 mL per growth regulator were carried out, being paclobutrazol (40 mg/L), prohexadione-Ca (300 mg/L), foliar abscisic acid (208 mg/L), abscisic acid applied through irrigation with the same concentration, and a mixture of abscisic acid (208 mg/L) with prohexadione-Ca (300 mg/L). The control group (without application of growth regulators) recorded approximately 11.06% of BER incidence. Paclobutrazol reduced the incidence of BER to 0%, increasing viable production by 0.5 kg/plant, despite causing a shortening of the internodes. The combination of prohexadione-Ca and foliar abscisic acid reduced the incidence of BER to 0.42% and increased viable production by 1.18 kg/plant. Foliar abscisic acid reduced BER to 1.12% and increased viable production by 0.75 kg/plant. The application of abscisic acid through irrigation, although increasing total production by 1.04 kg/plant and viable production by 1.16 kg/plant, was not as effective in reducing BER (7.16%). Prohexadione-Ca applied alone, in addition to not being economically viable, decreased BER to 7.34% and reduced total production by 1.2 kg/plant and viable production by 0.9 kg/plant. The results indicate that phytohormones as antagonists of gibberellins can act in reducing BERThe choice of growth regulator and its form of application should consider the crop, environmental conditions, and production objectives.
Blossom-End Rot (BER) is one of the main causes of production losses in various horticultural crops such as cucumber, tomato, and melon. Ana Carvalho company has dedicated to finding ways to minimize this physiological disorder in the 'Cândido' cultivar of pink tomato grafted onto Tro141 produced under greenhouse conditions. This study evaluated the effect of applying different growth regulators (paclobutrazol, prohexadione-Ca, and abscisic acid), which inhibit the phytohormone gibberellin, on the incidence of BER and on the productive, and economic performance of the crop. Weekly applications of 200 mL per growth regulator were carried out, being paclobutrazol (40 mg/L), prohexadione-Ca (300 mg/L), foliar abscisic acid (208 mg/L), abscisic acid applied through irrigation with the same concentration, and a mixture of abscisic acid (208 mg/L) with prohexadione-Ca (300 mg/L). The control group (without application of growth regulators) recorded approximately 11.06% of BER incidence. Paclobutrazol reduced the incidence of BER to 0%, increasing viable production by 0.5 kg/plant, despite causing a shortening of the internodes. The combination of prohexadione-Ca and foliar abscisic acid reduced the incidence of BER to 0.42% and increased viable production by 1.18 kg/plant. Foliar abscisic acid reduced BER to 1.12% and increased viable production by 0.75 kg/plant. The application of abscisic acid through irrigation, although increasing total production by 1.04 kg/plant and viable production by 1.16 kg/plant, was not as effective in reducing BER (7.16%). Prohexadione-Ca applied alone, in addition to not being economically viable, decreased BER to 7.34% and reduced total production by 1.2 kg/plant and viable production by 0.9 kg/plant. The results indicate that phytohormones as antagonists of gibberellins can act in reducing BERThe choice of growth regulator and its form of application should consider the crop, environmental conditions, and production objectives.
Description
Mestrado em Engenharia Agronómica / Instituto Superior de Agronomia, Universidade de Lisboa
Keywords
Solanum lycopersicum L. cálcio paclobutrazol Prohexadiona-Ca ácido abscísico calcium Prohexadione-Ca Abscísic acid
Pedagogical Context
Citation
Carvalho, L.M.C. Efeito da aplicação de 3 antagonistas/inibidores de giberelinas na síndrome de blossom-end-rot em tomateiro. Lisboa: ISA, 2024, 61 p. Dissertação de Mestrado
Publisher
Instituto Superior de Agronomia, Universidade de Lisboa