Crescimento de girassol como flor em vaso em função de doses de paclobutrazol

Wanderley, Christina da Silva; Faria, Ricardo Tadeu de; Rezende, Roberto

doi:10.1590/s0034-737x2014000100005

Cited by 15 publications

(20 citation statements)

References 11 publications

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“…In one of the few studies evaluating the effects of sunflower density on pests, Michaud, Stahlman, Jyoti, and Grant (2009) reported no effect on weed biomass and greater damage from insect pests in sunflower seeded at a higher density (3.6-3.9 plants m −2 ) compared with a lower density (2.4-2.6 plants m −2 ). High sunflower density can also lead to disease problems such as white mold (Sclerotinia sclerotirum) and downy mildew (Peronospora sparsa), as well as crop lodging which can reduce seed harvestability (Wanderley, de Faria, & Rezende, 2014).…”

Section: Introductionmentioning

confidence: 99%

Crop density affects weed suppression in organically managed Sunflower

et al. 2020

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A field experiment in central New York evaluated the effect of sunflower (Helianthus annuus L.) density on weed biomass and yield in organic sunflower production. Two varieties of sunflower, Badger DMR and N5LM307, were seeded at 6.1 and 8.6 seeds m−2, and grown using organic management practices at one site in 2016 and two sites in 2017. Sunflower density, weed biomass, and sunflower yield were quantified at crop maturity. Weed biomass was lower (P < .05) in plots with sunflower seeded at 8.6 seeds m−2 compared to 6.1 seeds m−2 in only one variety in one site‐year. However, a negative relationship (P < .05) was observed between sunflower density and weed biomass when data were pooled over site‐years. No difference was observed in sunflower seed yield between varieties or seeding rate treatments. Sunflower seed yield was higher in 2016 (354 g m−2) when conditions were extremely dry, and in one site‐year in 2017 (308 g m−2), when conditions were extremely wet and seeding was delayed by a month. In the other site‐year in 2017, sunflower seed yield was lower (225 g m−2), which was likely due to weed competition as weed biomass was an order of magnitude greater in this site‐year than the other two site‐years. Although more research is needed to refine management recommendations for organic sunflower production, our results suggest that increasing sunflower density can contribute to weed suppression.

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Section: Introductionmentioning

confidence: 99%

Crop density affects weed suppression in organically managed Sunflower

et al. 2020

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“…A reduced flower diameter was also observed in various sunflower genotypes treated with paclobutrazol applications (WANDERLEY et al, 2014). Some studies, however, showed an increased flower diameter of chrysanthemum and sunflower treated with daminozide (POOL et al, 2005;NEVES et al, 2009).…”

Section: Resultsmentioning

confidence: 98%

Production and leaf plasticity of rose plants sprayed with paclobutrazol and daminozide

Carvalho-Zanão

Grossi

Júnior

et al. 2017

SCA

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The aim of this work was to evaluate morphological and anatomical alterations in leaves of 'Yellow Terrazza' ® and 'Red White Terrazza' ® pot roses sprayed with paclobutrazol (0, 40, 60, 80 mg L -1 ) and daminozide (0, 2000, 4000, 6000, 8000 mg L -1 ). The experiments were conducted under greenhouse conditions using a factorial treatment design (cultivars x growth retardant doses) with five replications and experimental units arranged in randomized blocks. Cv. Yellow Terrazza ® presented higher plants, greater floral diameter and leaf area than cv. Red White Terrazza ® . Plant height, leaf area, and flower diameter decreased linearly with paclobutrazol and daminozide doses. In addition, paclobutrazol and daminozide applications changed leaf tissue proportions by increasing the thickness of leaf blade, mesophyll, palisade parenchyma, and spongy parenchyma but did not influence the thickness of leaf epidermis. Key words: Leaf anatomy. Growth retardants. Rosa hybrida. ResumoObjetivou-se com esse trabalho avaliar características fitotécnicas e alterações anatômicas quantitativas nas folhas de duas cultivares de roseira (Yellow Terrazza ® e Red White Terrazza ® ), cultivadas em vaso em função da pulverização foliar de doses de paclobutrazol (0, 40, 60, 80 mg L -1 ) em um experimento e doses de daminozide (0, 2000, 4000, 6000, 8000 mg L -1 ) em outro. Os experimentos foram conduzidos em ambiente protegido e os tratamentos dispostos em esquema fatorial (cultivares x doses dos retardantes), em delineamento de blocos casualizados com cinco repetições. A cultivar Yellow Terrazza ® apresentou plantas com maior altura, diâmetro floral e área foliar que a Red White Terrazza ® . O aumento da dose dos retardantes nas duas cultivares reduziu altura e área foliar, promoveu mudanças na proporção dos tecidos, aumentou a espessura da lâmina foliar, mesofilo e dos parênquimas paliçádico e lacunoso. Os retardantes não influenciaram a espessura das epidermes das cultivares. O tecido parenquimático das cultivares apresenta plasticidade com aplicação dos retardantes. Palavras-chave: Anatomia foliar. Retardantes de crescimento. Rosa hybrida.

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“…These same authors affirmed that the effect of reduction in accumulation of stem dry mass, capitulum and root were caused by the application of growth regulator, which shows a preferred carbohydrate washed to produce capitula. Wanderley et al (2014) observed that growing doses of Helio paclobutrazol significantly reduced the amount of root dry mass in sunflower genotype 358. For BRS Oasis, the reduction of accumulated dry mass was found only in the stem with a 2 L ha -1 dose or higher.…”

Section: Dry Mass Of Plantsmentioning

confidence: 96%

“…In the case of ornamental sunflower, its productivity should be evaluated based on plant height and quality of its inflorescences, which should be accompanied by plants with an adequate height to vases (Neves et al, 2005). According to Wanderley et al (2014), the sunflower offers the advantage of a short cycle of about 60 days and the easiness of seeds dispersal. Plant growth regulators are generally used in floriculture industry for height control, branching and flowering.…”

Section: Introductionmentioning

confidence: 99%

“…Gibberellic acid treatments have been reported to promote the early flowering in different floricultural products and to increase the efficiency and the quality of them (El-Naggar et al, 2009). Wanderley et al (2014) claimed that growth regulators can be used to control the height of the plants. Some synthetic products can inhibit the synthesis of gibberellins, such as chlormequat, daminozide, paclobutrazol and mepiquat chloride.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Growth regulators for reduction of height in potted red-yellow sunflower Helianthus annuus cv. 'Florenza'

Suzuki¹,

Brazil²,

Alves³

et al. 2018

Aust J Crop Sci

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The market for flowers and ornamental plants has been growing in Brazil. In this context, sunflower has been increasing its importance mainly as a cut flower. There are cultivars of distinct colors and shapes, but sunflower is a very high flower to be selled in pots. The objective of this research was to evaluate the effect of the growth regulators such as mepiquat chloride and paclobutrazol in the height reduction of the Sunflower known as 'Florenza' to be used it in potted flower. We adopted a completely randomized design in a 2x5 factorial scheme with 11 treatments and ten repetitions. In five samples, the mepiquat chloride (0, 2, 4, 6, 8, 10 L ha ) were applied. The applications were repeated at 15, 30 and 45 days after sowing. The plant height, stem diameter, intern diameter of the main capitulum, number of leaves and capitula, dry mass of leaves, stem, capitula and root, leaf area and chlorophyll content were evaluated. The concentration of 10 L ha -1 of mepiquat chloride was the most effective dose in reducing the height of a red-yellow 'Florenza' sunflower showing a height 43.2 cm smaller than the one from the control treatment.

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Crescimento de girassol como flor em vaso em função de doses de paclobutrazol

Cited by 15 publications

References 11 publications

Crop density affects weed suppression in organically managed Sunflower

Crop density affects weed suppression in organically managed Sunflower

Production and leaf plasticity of rose plants sprayed with paclobutrazol and daminozide

Growth regulators for reduction of height in potted red-yellow sunflower Helianthus annuus cv. 'Florenza'

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