scholarly journals Number of Stock Plant Shoot Nodes Influences Splitting of `Lilo' Poinsettia

1992 ◽  
Vol 2 (2) ◽  
pp. 206-207 ◽  
Author(s):  
Stephen A. Carver ◽  
Harry K. Tayama
Keyword(s):  
Euphorbia Pulcherrima ◽  
Stock Plant ◽  
Axillary Shoots ◽  
Floral Buds ◽  
Terminal Buds ◽  
Subsequent Splitting

The influence of poinsettia (Euphorbia pulcherrima Wild. ex Klotzsch) stock plant shoot maturity on subsequent splitting of cuttings taken from the shoots was evaluated. Terminal cuttings (7.5 cm) taken from `Lilo' poinsettia stock plant axillary shoots that had 4, 8, or 12 nodes were rooted, planted, then observed for initial signs of splitting (conversion of the vegetative terminal buds into floral buds). The percentages of cuttings that split were 22, 77, and 100 for those taken from shoots with 4, 8, and 12 nodes, respectively. By implication, cuttings should be taken just as stock plant axillaries reach a size adequate for propagation to help reduce the incidence of splitting.

scholarly journals Growth of Euphorbia pulcherrima and Pelargonium ×hortorum in Shredded Rubber-containing Substrates

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 657e-657
Author(s):  
Michael R. Evans ◽  
Andrew A. Waber
Keyword(s):  
Euphorbia Pulcherrima ◽  
Fresh Weight ◽  
Axillary Shoots ◽  
Shoot Fresh Weight ◽  
Sphagnum Peat ◽  
Axillary Branches ◽  
Weight Number

Euphorbia pulcherrima `Freedom' (poinsettia) and Pelargonium ×hortorum `Pink Elite' (geranium) were grown in 75:25:0, 50:50:0, 27:75:0, 75:0:25 50:0:50, 25:0:75 (v/v sphagnum peat: 0.25-grade rubber: 0.10-grade rubber) substrates or in a 50 sphagnum peat: 30 perlite: 20 loam (v/v) standard greenhouse substrate. Geranium root and shoot fresh weights, height, and number of axillary shoots were reduced when grown in rubber-containing substrates compared to plants grown in the standard control. As the proportion of either grade of rubber increased, root and shoot fresh weights, height, and number of axillary shoots decreased. Flowering in geranium was delayed and the number of inflorescences reduced as the proportion of the 0.10-grade rubber increased. Plants grown in the 0.25-grade rubber failed to flower by the termination of the experiment. Poinsettia plants grown in rubber-containing substrates had reduced shoot fresh weight, height, number of bracts, and bract area compared to plants grown in the standard control. As the proportion of either grade of rubber increased, height, shoot fresh weight, number of bracts, and bract area decreased. Number of axillary branches was reduced in substrates containing 50% and 75% of the 0.10-grade rubber. Days to anthesis was unaffected by substrate.

scholarly journals Axillary Shoot Growth, Rooting and Overwinter Survival in Stem Cuttings of Viburnum dentatum ‘Chicago Luster’

2006 ◽  
Vol 24 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Philip J. Wilson ◽  
Daniel K. Struve
Keyword(s):  
Controlled Release ◽  
Radial Distribution ◽  
Shoot Growth ◽  
Axillary Shoot ◽  
Initial Growth ◽  
Stem Cuttings ◽  
Stock Plant ◽  
Axillary Shoots ◽  
Overwinter Survival ◽  
Distribution Of Roots

Abstract The effects of stock plant and cutting manipulation on propagation success of Viburnum dentatum ‘Chicago Luster’ were studied. One-node semi-hardwood stem cuttings were harvested from greenhouse-grown stock plants. Cuttings from plants decapitated 21 days before harvest (compared to non-decapitated plants), and one-leaf (compared to two-leaf) cuttings, had relatively high rooting potential and a high initial percentage of axillary shoot flushing. However, subsequent shoot growth, and overwinter survival, were less. A second stock plant decapitation resulted in the flushing and initial growth of all axillary shoots by the time cuttings were stuck. These cuttings all survived the propagation phase and soon resumed shoot growth, even after transplanting, and the plants all survived the following winter. In cuttings with actively growing axillary shoots, shoot extension growth was greatest in cuttings reduced at sticking to one leaf and one shoot in the leafless axil, but the radial distribution of roots was not uniform, being concentrated in the same 180° sector of the stem as the shoot. Incorporating controlled-release fertilizer (CRF) in the rooting substrate during the propagation phase tended to reduce initial survival but promoted rooting and shoot growth among the survivors, even after transplanting and increased overwinter survival.

scholarly journals Photoperiod of Poinsettia Stock Plants Influences Rooting of Cuttings

1997 ◽  
Vol 7 (1) ◽  
pp. 41-43
Author(s):  
Michael J. Roll ◽  
Steven E. Newman
Keyword(s):  
Flower Initiation ◽  
Euphorbia Pulcherrima ◽  
Root Mass ◽  
Stock Plant ◽  
Critical Daylength ◽  
Plant Stage ◽  
Rooting Of Cuttings

Rooting of cuttings from three cultivars of Euphorbia pulcherrima Willd. was evaluated after regulating the photoperiod during the stock plant stage. One group of stock plants was exposed to a night break (4 hours) and another group was exposed to natural daylength during September. Cuttings harvested in late September from `Freedom Red' and `Monet' stock plants grown under the 4-hour night break rooted more rapidly and had greater root mass than `Freedom Red' and `Monet' grown under natural daylength, whereas rooting of cuttings from `V-17 Angelika Marble' was not influenced by the photoperiods tested. Using a night break to prevent flower initiation of stock plants produced a higher-quality cutting when propagation took place after the critical daylength for flowering had passed.

scholarly journals Cornus florida Floral Development

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 860D-860
Author(s):  
K.R. Maluea ◽  
R.W Holton ◽  
S.E. Schlarbaum ◽  
E.T. Graham ◽  
R.N. Triaiano
Keyword(s):  
Light Microscopy ◽  
Floral Development ◽  
Cornus Florida ◽  
Floral Initiation ◽  
Histological Techniques ◽  
Floral Buds ◽  
Terminal Buds ◽  
Landscape Trees

Cornus florida L. floral development was monitored using standard paraffin histological techniques and light microscopy. Terminal buds (putative floral buds) were collected over 6 weeks from mature landscape trees located on The Univ. of Tennessee Agricultural Campus, Knoxville. Examination of samples taken at 3- to 7-day intervals revealed variations in development representing 1- to 2-week differences between florets in a single inflorescence, florets on the same tree and florets from different trees. Floral initiation occurred before July 19th in the 2 years of this study. Floral development followed typical angiosperm stages. Florets, although small, appeared morphologically mature by early September in both years.

scholarly journals Micropropagation of Flame Azalea

1988 ◽  
Vol 6 (2) ◽  
pp. 45-47
Author(s):  
Frank A. Blazich ◽  
Juan R. Acedo
Keyword(s):  
Woody Plant ◽  
Shoot Multiplication ◽  
Shoot Formation ◽  
Multiple Shoot ◽  
Axillary Shoot ◽  
Stock Plant ◽  
Axillary Shoots ◽  
Growing Stock ◽  
Woody Plant Medium ◽  
Axillary Shoot Multiplication

Shoots tips excised from an actively growing stock plant of flame azalea [Rhododendron calendulaceum (Michx.) Torr.] were surface sterilized, the terminal portions were removed (decapitated) and the shoots placed horizontally on agar-solidified Woody Plant Medium (WPM) supplemented with 15 ppm 6-(γ, γ-dimethylallylamino)-purine (2iP). Within 4 to 6 months multiple shoot formation commenced. After 2 to 3 additional months of growth, axillary shoots were excised from the original explants. The shoots were decapitated and placed on WPM. After 2 subcultures, 8-node axillary shoots were excised, decapitated and cultured on agar-solidified WPM supplemented with 0, 4, 8, 12, 16, 24, and 32 ppm 2iP. The greatest number of shoots (microcuttings) ≥ 5 mm (0.2 in) were produced at 12 ppm 2iP. Microcuttings ≥ 10 mm (0.4 in) were rooted using ex vitro procedures. Enhancement of both axillary shoot multiplication and shoot length was achieved by addition to the medium of 80 ppm adenine sulfate and 200 ppm NaH2PO4.

scholarly journals Effects of Daily Light Integral and Canopy Density on Shoot Growth and Development in a Poinsettia (Euphorbia pulcherrima Willd. ex. Klotsch) Stock Plant Canopy

HortScience ◽  
2014 ◽  
Vol 49 (1) ◽  
pp. 51-54 ◽  
Author(s):  
Joaquin A. Chong ◽  
Uttara C. Samarakoon ◽  
James E. Faust
Keyword(s):  
Growth And Development ◽  
Shoot Growth ◽  
Euphorbia Pulcherrima ◽  
Plant Canopy ◽  
Stock Plant ◽  
Canopy Density ◽  
Daily Light Integral ◽  
Level 1 ◽  
Light Integral ◽  
Level 2

Poinsettia stock plants consist of a dense canopy of competing shoots, and the growth and development of these individual shoots have not been previously quantified. The effects of air temperature, daily light integral (DLI), and canopy density (CD) were investigated on poinsettia (Euphorbia pulcherrima Willd. ex. Klotsch) ‘Freedom Red’ shoot development in a stock plant canopy. Plants were grown at two constant temperatures (20.3 or 25.7 °C), five CD (43, 86, 129, 172, or 215 shoots/m2), and three DLI treatments (2.6, 4.4, or 7.7 mol·m−2.d−1 for the September planting and 4.0, 6.0, or 10.6 mol·m−2.d−1 for the January planting). Shoot position at the final data collection was used to assign shoots to different levels within the canopy; Level 1 = the four highest shoots, Level 2 = the next four highest shoots, and so forth for Levels 3, 4, and 5. Temperature did not significantly affect leaf unfolding rate (LUR), shoot fresh mass (FM), or shoot caliper, whereas DLI and CD affected shoot growth and development. LUR and FM increased as DLI increased from 2.6 to 10.6 mol·m−2.d−1, whereas LUR and FM decreased on the uppermost shoots in the canopy, e.g., Level 1 shoots, as CD increased from 43 to 129 shoots/m2. Therefore, higher CD required higher DLI to achieve similar LUR and FM. Shoot caliper on Level 1 shoots increased from 6.3 to 7.4 mm as CD decreased from 129 to 43 shoots/m2; and shoot caliper increased from 5.8 to 7.6 mm as DLI increased from 4.0 to 10.6 mol·m−2.d−1. The DLI environment needs to be managed to accommodate greater CD, to sustain growth and development of individual shoots within the canopy of poinsettia stock plants.

Cytokinins from terminal buds of Euphoria longana during different growth stages

1997 ◽  
Vol 99 (1) ◽  
pp. 185-189
Author(s):  
Wen-Shaw Chen ◽  
Kuang-Liang Huang ◽  
Hsiao-Ching Yu
Keyword(s):  
Growth Stages ◽  
Terminal Buds ◽  
Different Growth Stages

Ximena, variedad de nochebuena (Euphorbia pulcherrima Willd. ex Klotzsch) para decorar espacios de interior

2020 ◽  
Vol 13 (6) ◽  
Author(s):  
Jaime Canul Ku ◽  
Faustino García-Pérez ◽  
Edwin J. Barrios-Gómez ◽  
Sandra E. Rangel-Estrada
Keyword(s):  
Euphorbia Pulcherrima

Objetivo: Describir la variedad de nochebuena Ximena en base a directrices de la UPOV y evaluar su comportamiento con un productor cooperante en el estado de Morelos.Diseño/metodología/aproximación: La variedad se generó mediante los métodos genotécnicos de hibridación, selección recurrente y uso de la técnica de injerto. La descripción varietal se realizó en base al documento de la Unión para la Protección de las Obtenciones Vegetales (UPOV). El diseño experimental utilizado fue un completamente al azar con 10 repeticiones. Se registraron caracteres vegetativos y de bráctea de la planta. La información se estudió mediante análisis de varianza y prueba de comparación de medias Tukey (P? 0.05).Resultados: Ximena presenta porte alto, de amplitud grande con ramificación intermedia. La hoja de forma oval, larga y ancha con peciolo de longitud media. Brácteas de forma elíptica, color rojo, sin torsión y rugosidad entre los nervios. La anchura de la cima es media, glándulas del ciatio de color amarillo de tamaño medio sin alguna deformación. La respuesta de Ximena fue estadísticamente similar a los dos testigos en diámetro del tallo, número de entrenudos, ancho de hoja, longitud de peciolo de hoja y bráctea. En cambio, fue superior estadísticamente en longitud de bráctea, amplitud de dosel de bráctea y diámetro de ciatio.Limitaciones del estudio/implicaciones: La variedad se mantiene como planta madre, a partir de la cual se van a establecer cultivos comerciales. Por lo que, requiere adecuada nutrición y condiciones que no permitan su diferenciación floral.Hallazgos/conclusiones: El comportamiento y arquetipo de Ximena fue comparable a la de variedades comerciales, posee características estéticas que demanda el mercado, puede ser competitiva y se considera candidata para diversificar la oferta de plantas de nochebuena en la temporada de navidad.

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