Effect of ethrel, chlormequat chloride and paclobutrazol on growth and pyrethrins accumulation in Chrysanthemum cinerariaefolium Vis.

Haque, Smaranya; Farooqi, Æ A. H. A.; Gupta, Madan M.; Sangwan, Rajender S.; Khan, Abid Ali

doi:10.1007/s10725-007-9170-6

Cited by 31 publications

(20 citation statements)

References 22 publications

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“…No entanto, não é possível afirmar se este é menos eficiente, pois o maior comprimento do colmo pode ter ocorrido em função da dose estudada ou da forma de aplicação (Klein et al, 2002). Além disso, Haque et al (2007) encontrram maior redução da estatura das plantas de crisântemo (Chrysanthemum cinerariaefolium) com o paclobutrazol e não com o clormequat.…”

Section: Resultados Resultados Resultadosunclassified

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Espindula¹,

Rocha²,

Souza³

et al. 2010

Acta Sci. Agron.

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RESUMO. Objetivou-se com este trabalho avaliar o efeito de doses e épocas de aplicação de três reguladores de crescimento na elongação do colmo de plantas de trigo. O experimento, conduzido em Viçosa, Estado de Minas Gerais, de maio a setembro de 2005, foi instalado com tratamentos em esquema fatorial e hierárquico com uma testemunha, no delineamento em blocos casualizados com quatro repetições. Os tratamentos foram 500; 1.000 e 1.500 g ha -1 de clormequat; 62,5; 125,0 e 187,5 g ha -1 de trinexapac-etil e 40; 80 e 120 g ha -1 de paclobutrazol, aplicados no estádio 6 ou 8 da escala Feeks e Large, e uma testemunha. O comprimento do colmo com trinexapac-etil foi menor do que com o clormequat, que, por sua vez, foi menor do que com o paclobutrazol. A aplicação de reguladores na época 1 promoveu maior redução dos entrenós basais, enquanto a aplicação na época 2 proporcionou maior influência no pedúnculo. O aumento das doses de clormequat e trinexapac-etil promoveu redução do comprimento do colmo e das partes que o formam. O aumento das doses de paclobutrazol promoveu respostas pouco expressivas no colmo e seus componentes. Palavras-chave:Triticum aestivum L., clormequat, trinexapac-etil, paclobutrazol. ABSTRACT. Effect of growth regulators on wheat stem elongation.The objective of this work was to evaluate the effect of doses and times of application of three growth regulators on wheat stem elongation. The experiments were conducted in Viçosa, Minas Gerais State, from May to September 2005, in a factorial and hierarchical randomized block design with four repetitions and a control treatment. Treatments consisted of 500, 1000 and 1500 g ha -1 of chlormequat; 62.5, 125.0 and 187.5 g ha -1 of trinexapac-ethyl and 40, 80 and 120 g ha -1 of paclobutrazol, applied either at the 6 or 8 stage of the Feeks and Large scale, with a control. Stem length with trinexapac-ethyl was smaller than with chlormequat, which was in its turn smaller than with paclobutrazol. Application of growth regulators at stage 1 produced shorter basal internodes, whereas the stage 2 application caused greater reduction in the peduncle. The increase in chlormequat and trinexapac-ethyl doses reduced length of stem and its parts. The increase in paclobutrazol doses had very small effects on wheat growth and its parts.

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Section: Resultados Resultados Resultadosunclassified

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Espindula¹,

Rocha²,

Souza³

et al. 2010

Acta Sci. Agron.

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“…It was also observed that under ethrel treatment there was a higher incorporation of 14 CO 2 in piretrins. According to the authors this result indicates that ethrel could influence the activity of enzymes linked to the piretrin biosynthetic pathway (Haque et al 2007). In Catharanthus roseus cell suspension, Decendit et al (1993) and Papon et al (2005) observed an increase in geranyl 10-hidroxylase activity when the medium was supplied with cytokinin (zeatin).…”

Section: Oppmentioning

confidence: 98%

“…GA ∅ x Activation of compounds conversion Zhang et al 2005 Catharanthus roseus CYT + x Increase of enzyme activity Decendit et al 1993;Papon et al 2005;Oudin et al 2007 Chrysanthemum cinerariaefolium ET ∅ x Enzyme activation Haque et al 2007 Cymbopogon citratus CYT + ∅ Source of hormone Craveiro et al 1989 C. citratus …”

Section: Artemisia Annuamentioning

confidence: 99%

Growth regulators and essential oil production

Prins

Vieira

Freitas

2010

Braz. J. Plant Physiol.

117

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The aroma and fragrance industry is a billion-dollar world market which grows annually. Essential oils comprise the majority of compounds used by these industries. These sets of metabolites are formed mainly by monoterpenes, which are products of the plants' secondary metabolism. Biosynthesized from mevalonate and methylerythitol phosphate, the essential oil production depends not only on genetic factors and the developmental stage of plants, but also on environmental factors which could result in biochemical and physiological alterations in plants modifying the quantity and quality of the essential oil. These modifications impair aromatic plant production aimed at essential oil by reducing their quality. It is desirable to develop techniques of agronomical management to improve essential oil products and their specific compounds. Among other factors influencing essential oil production are plant growth regulators or plant hormones. Endogenous levels as well exogenous application could affect essential oil production and chemical composition. In this review we will present research in which plant growth regulators or their synthetic analogs were used and their effects on essential oil production.

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“…The main purpose of using the growth regulator is to disrupt the biosynthesis of gibberellic acid, thus influencing dry matter production, which is related to the transport of carbohydrates because the development of the cotton plant is related to favorable weather conditions, water and also nutrient availability (ELKOCA; KANTAR, 2006;HAQUE et al, 2007;TAIZ;ZEIGER, 2013). Height control of cotton plant can be efficiently performed with the use of MC, as it inhibits cell growth (LAMAS, 2001).…”

Section: Resultsmentioning

confidence: 99%

<b>Vegetative growth response of cotton plants due to growth regulator supply via seeds

et al. 2015

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ABSTRACT. The global cotton industry is distinguished by its numerous industrial uses of the plume as well as by high production costs. Excessive vegetative growth can interfere negatively with productivity, and thus, applying growth regulators is essential for the development of the cotton culture. The objective of this study was to evaluate the development and yield of the cotton cultivar FMT 701 with the application of mepiquat chloride to seeds and leaves. The experimental design used a randomized block design with four replications, arranged in bands. The treatments consisted of mepiquat chloride rates (MC) (0, 4, 6, 8 and 10 g a.i. kg -1 of seeds) applied directly to the cotton seeds and MC management by foliar spray using a 250 mL ha -1 rates that was administered under the following conditions: divided into four applications (35, 45, 55 and 65 days after emergence); as a single application at 70 days; and without the application of the product. The mepiquat chloride applied to cotton seeds controls the initial plant height and stem diameter, while foliar application reduces the height of the plants. After application to seed, foliar spraying MC promotes increase mass of 20 bolls, however no direct influence amount bolls per plant and yield of cotton seed. Higher cotton seed yield was obtained with a rate of 3.4 g a.i. MC kg -1 seeds.Keywords: mepiquat chloride, growth, yield components.Resposta do crescimento vegetativo do algodoeiro em relação à aplicação de regulador de crescimento via sementes RESUMO. A indústria mundial do algodão distingui-se por suas numerosas utilizações industriais da pluma, bem como pelos elevados custos de produção. Crescimento vegetativo excessivo pode interferir negativamente na produtividade e, por conseguinte, a aplicação de reguladores de crescimento é essencial para o desenvolvimento da cultura do algodão. O objetivo deste estudo foi avaliar o desenvolvimento e a produtividade do algodoeiro cultivar FMT 701 em função de aplicação de cloreto de mepiquat via sementes e folhas. O delineamento experimental utilizado foi de blocos ao acaso com quatro repetições, dispostos em faixas. Os tratamentos consistiram de doses de cloreto de mepiquat (CM) (0, 4, 6, 8 e 10 g ia kg -1 de sementes) aplicadas diretamente nas sementes de algodão e do manejo de CM via pulverização foliar na dose de 250 mL ha -1 da seguinte forma: divididos em quatro aplicações (35, 45, 55 e 65 dias após a emergência), como uma única aplicação, aos 70 dias, e sem a aplicação do produto. O cloreto de mepiquat aplicado via sementes de algodão controla a altura inicial das plantas e o diâmetro do caule, enquanto que a aplicação foliar reduz a altura das plantas. Após aplicação nas sementes, pulverização foliar de CM promoveu aumento da massa de 20 capulhos, no entanto não promoveu influência na quantidade de capulhos por planta e na produtividade de algodão em caroço. Maior rendimento de algodão em caroço foi obtido com dose de 3,4 g ia de CM kg -1 de sementes.Palavras-chave: cloreto de mepiquat, crescimento, com...

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Effect of ethrel, chlormequat chloride and paclobutrazol on growth and pyrethrins accumulation in Chrysanthemum cinerariaefolium Vis.

Cited by 31 publications

References 22 publications

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Efeitos de reguladores de crescimento na elongação do colmo de trigo

Growth regulators and essential oil production

<b>Vegetative growth response of cotton plants due to growth regulator supply via seeds

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