Controlling Plug Height of Verbena, Celosia, and Pansy by Treating Seeds with Paclobutrazol

Abstract

<jats:p>Shoot stretching in plug production reduces quality and makes mechanized transplanting difficult. The objectives of this study were to measure seedling emergence and shoot height of plugs as affected by paclobutrazol application during seed soaking, priming, or coating on seedling emergence and height. Verbena (<jats:italic>Verbena</jats:italic> ×<jats:italic>hybrida</jats:italic> Voss. `Quartz White'), pansy (<jats:italic>Viola wittrockiana</jats:italic> L. `Bingo Yellow Blotch'), and celosia (<jats:italic>Celosia cristata</jats:italic> L. `New Look') seeds were soaked in water solutions of paclobutrazol and subsequently dried on filter paper at 20 °C for 24 h. Soaking seeds in paclobutrazol solutions before sowing reduced growth and percentage seedling emergence of verbena and pansy but had little effect on those of celosia. Verbena seeds soaked in 50, 200, or 500 mg paclobutrazol/L for 5, 45, or 180 min produced fewer and shorter seedlings than controls. Osmopriming verbena seeds with 10 to 500 mg paclobutrazol/L reduced seedling emergence. Seedling height and emergence percentage of pansy decreased with increasing paclobutrazol concentrations from 2 to 30 mg·L<jats:sup>–1</jats:sup> and with soaking time from 1 to 5 min. The elongation of celosia seedlings was reduced by soaking seeds in 10, 50, 200, or 500 mg paclobutrazol/L solutions for 5, 180, or 360 min. However, these reductions were negligible and without any practical application.</jats:p>

Effect of foliar application of boron and zinc on growth and flowering characters in African marigold cv. Pusa Narangi Gainda

“…Recently scientists have given more attention towards the regulation of plant growth, yield and quality of flowers through plant growth retardants. Plant growth retardants can delay cell division and elongation of plant aerial parts as well restrict gibberellins biosynthesis, resulted in reducing the internodal length and vegetative growth (Magnitskiy et al 2006).…”

The Effect fo Iron Nano-Chelate Fertilizer and Cycocel (CCC) on Some Quantity and Quality Characters of Euphorbia Pulcherrima Willd

“…The effect of plant growth retardants depend on the time and method of application, concentration and species and varieties type, type of target organ and environmental and physiological conditions [5], [6]. Plant growth retardants delay cell division and elongation of shoot and restricting the construction of gibberellin reduces internodes length and vegetative growth [7]. Plant retardants inhibit gibberellin biosynthesis.…”

Reguladores de crescimento na redução do porte da orquídea Estrela-de-Fogo para comercialização em vaso

“…O uso de reguladores de crescimento tem sido aplicado na floricultura (PATELI et al, 2004), sendo dessa forma estudadas em várias plantas ornamentais como azaleias (WHEALY et al, 1988), crisântemos (NELL et al, 1980), gerânio (NUCCI et al, 1991), poinsetia, gerânios, hibiscos (BARRETT, 2001, calânchoe (BETTONI et al, 2009). Esses produtos podem atrasar a divisão celular, bem como restringir a biossíntese de giberelinas (GA), reduzindo assim o crescimento nos entrenós, ou seja, diminuindo sua altura, (MAGNITSKIY et al, 2006). Esta redução facilitaria a comercialização de E. radicans como orquídeas envasadas, que é uma tendência de mercado O paclobutrazol (PBZ) tem sido bastante estudado em ornamentais, por reduzir o alongamento da haste floral, sem danificar as inflorescências (GIANFAGNA, 1987).…”