Desempenho fisiológico de sementes de algodoeiro tratadas com tiametoxam

Abstract

RESUMO -Novos produtos para incorporação às sementes vêm sendo disponibilizados anualmente. Bioativadores, como o inseticida tiametoxam, são utilizados para aumentar o potencial produtivo das plantas, através de modificações no metabolismo vegetal. Objetivou-se neste trabalho avaliar os efeitos do tiametoxam na qualidade fisiológica de sementes de algodoeiro, particularmente no crescimento radicular de plântulas de algodoeiro e estabelecer concentrações do produto para pré-tratamento de sementes. Foram utilizados três lotes de sementes de algodoeiro, cultivar CD 408, tratadas com Cruiser® 350 FS contendo 35 gramas de ingrediente ativo (i.a.) de tiametoxam por litro, sendo, submetidas a seis doses: 0, 2, 4, 6, 8 e 10 mL de Cruiser® 350 FS/kg de semente. As avaliações utilizadas foram: germinação, primeira contagem de germinação, envelhecimento acelerado, comprimento e massa de matéria seca do sistema radicular, índice de velocidade de emergência e emergência final de plântulas. O tratamento de sementes de algodoeiro com tiametoxam favorece positivamente a qualidade fisiológica das sementes, e as doses de 5,0 a 7,0 mL de Cruiser® 350 FS/ kg de semente mostram-se mais eficientes em melhorar o desempenho fisiológico das sementes de algodoeiro.Termos para indexação: Gossypium hirsutum, bioativador, vigor, qualidade fisiológica. PHYSIOLOGICAL PERFORMANCE OF COTTON SEEDS TREATED WITH THIAMETOXAMABSTRACT -The introduction of new seed treatment products is increasing and bioactivators, such as the insecticide thiametoxam, are used to increase plant yield potential by modifying metabolism. The objective of this study was to evaluate the effects of thiametoxam on the physiological quality of cotton seeds, particularly on seedling root growth, and establish product concentrations for seed pre-treatment. Three seed lots of the cultivar CD 408 were evaluated which had been treated with six dosages of Cruiser® 350 FS containing 35 g/L A.I. of thiametoxam, at 0, 2, 4, 6, 8 and 10 mL per kg of seeds. Parameters measured included: standard germination test, germination first count, accelerated ageing, root dry matter and length, emergence velocity rate and final seedling emergence. Cotton seeds treated with thiametoxam demonstrated improved physiological quality of the seeds and the dosages of 5.0 to 7.0 mL of the Cruiser® 350 FS/kg of seeds were more efficient in improving the physiological performance of cotton seeds.

Bioativador no desempenho fisiológico de sementes de arroz

“…A partir desse ponto, começa a apresentar diminuição, conforme aumenta a dose do produto, desta maneira apresentando uma curva com comportamento quadrático. (Lauxen et al, 2010).…”

Physiological quality of bean genotypes seeds peanut and xamego treated with fungicides and insecticides

“…These phases are associated with an increase in organic synthesis, rubisco activity, the amount of chlorophyll and hormones, leading to increase in the photosynthetic capacity in plants (Taiz and Zeiger, 2017). These results can improve the seedlings development due to the seed treatment, and Thiametoxan acting as a bioactivator in providing a larger aerial plant part (Acevedo and Clavijo, 2008;Lauxen et al, 2010). Pyraclostrobin + Metiram applied in tomatoes promoted an increase in the weight and volume (Guimarães et al, 2014).…”

“…physiological performance of rice seeds (Almeida et al, 2011), and cotton seeds (Lauxen et al, 2010), when treated with 35 g of active L -1 ingredient.…”

Attenuation of low-temperature stress in rice seedlings

“…For GA 3 , there is a preference for shoot growth over the root system, in both cultivars. This is because GA 3 acts on mesocotyl elongation, mainly in Indica subspecies cultivars, showing a 10 mm difference between seedlings treated with GA 3 and control seedlings, due to increased cell wall plasticity and sugar hydrolysis, reducing water potential in the cell, resulting in water ingress and seedling elongation, especially in the mesocotyl (Lee et al 2012 (Tavares et al 2007, Lauxen et al 2010, Almeida et al 2011), but the reasons that lead to this stimulus have yet to be elucidated. In the field, this effect was attributed to greater water and nutrient absorption (Tavares et al 2007).…”