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  • Author or Editor: R.D. Wright x
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Foliar application of 6-benzylaminopurine (BA) to Ilex crenata cvs. Helleri and Rotundifolia increased the number of axillary shoots per plant. ‘Helleri’ axillary shoot number was increased 4 times by 500 ppm BA whereas axillary shoot number of Rotundifolia was increased 1.5 and 3 times by 100 and 500 ppm respectively. Leaf size and shoot length were significantly reduced by 500 ppm BA.

Open Access
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Abstract

‘Burfordii’ holly was grown at day/night temperature combinations of 26°/22°, 22°/18° and 18°/14°C under either a long photoperiod (LD = 9 hours + 3 hours dark interruption) or short photoperiod (SD = 9 hours). The number and growth of new shoots were significantly greater at 26°/22° than at 22°/18° and no shoot growth occurred at 18°/14°. Leaf size was significantly smaller at 26°/22° than at 22°/18°. Holly shoot growth was greater under LD than SD. No significant temperature-photoperiod interaction was observed.

Open Access
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Abstract

Inflorescence development and fruit set of ‘Burford’ holly was rapid at a day/night temperature of 26°/22°C and progressively slower at 22°/18° and 18°/14°. The number of flowers to set fruit, however, was increased at lower temperatures for both long photoperiod (LD = 9 hours + 3 hours dark interruption) and short photoperiod (SD = 9 hours). At 22°/18°, SD increased fruit set over LD. No significant temperature-photoperiod interaction was observed. A greater number of vegetative shoots developed as temperature increased and mean shoot length was correlated with the number of flowers to set fruit.

Open Access

Abstract

Rooted linears of Ilex crenata Thunb. ‘Helleri’ and ‘Rotundifolia’ were grown in polyvinyl chloride pipe sections from which longitudinal sections could be removed for root observations. Plants were fertilized at either 150 or 300 ppm N with a 20N–8.7P–16.5K soluble fertilizer. Rate of root and shoot growth was determined through 2-3 flushes of growth by taking weekly measurements of shoots and roots. Root growth of both cultivars was episodic in nature with active root growth usually preceding a shoot growth flush by 1 to 2 weeks. This growth pattern was observed in both fertility levels.

Open Access
Authors: and

Abstract

Determinations of carbohydrates in the plant organs of Rhododendron spp. cv. ‘Sweetheart Supreme’ and ‘Hexe’, were made by chemical analysis, thin-layer chromatography (TLC) and gas-liquid chromatography (GLC). Reducing sugar content was 1.5 times higher in buds than in leaves for ‘Hexe’ with no significant differences for ‘Sweetheart Supreme’. Reducing sugars were also higher in the roots than stems with both cultivars. Sucrose content was 1.4 times greater in leaves than in buds of ‘Hexe’ and 1.6 times greater in ‘Sweetheart Supreme’. Starch was significantly higher in leaves and buds than in stems and roots. The predominant soluble sugars identified by TLC and GLC were sucrose, glucose, and fructose. Small but detectable amounts of raffinose and maltose and an unidentified compound were also found in the plant organs.

Open Access

Abstract

The effects of 3 nitrogen levels and 2 growth regulators on growth of winter- and summer-rooted cuttings of Ilex crenata cv. Helleri were studied. Nitrogen applications promoted bud break immediately after rooting on summer cuttings and also enhanced the growth of winter-rooted cuttings. Generally, plants grown at 300 or 150 ppm N had greater shoot numbers and length, height, width, and dry weight compared to plants grown at 50 ppm N. Also spring growth of these liners was markedly enhanced by the higher level of N applied the previous season. Benzyladenine (BA) at 600 ppm increased the number of breaks and suppressed stem length, while gibberellic acid (GA3) at 400 ppm decreased the number of breaks and increased stem length.

Open Access

Abstract

Ilex cornuta ‘Burfordii’ holly plants were maintained at 3-4°C for 0, 2, 4, 6 or 8 weeks. Following these treatments, the number of flowers to develop were greatest on plants receiving 6 or 8 weeks of chilling. Time required for flowering to begin and the duration of flowering was shortened by the longer exposures to cold treatment

Open Access

Abstract

‘Burford’ holly (Ilex cornuta Lindl. et Paxt. cv. Burfordii) differentiates primordia in September which were subsequently identified as flowers. The pistillate flower only partially differentiated by early winter and consisted of a pedicel, 2 bracts, 4 petals, and 4 stamens. Completion of flower differentiation and anthesis occurred in the spring.

Open Access

Abstract

Fertilizer applied during a period following the cessation of stem elongation and before the next flush resulted in greater total tissue N and shoot growth than applications made during other stages of growth in ‘Helleri’ holly. Root growth was suppressed by 3 or more fertilizer applications, regardless of the time of application.

Open Access

Abstract

The effects of 3 nitrogen treatments on tissue N fluctuations of ‘Helleri’ holly. All N concentrations increased following the cessation of shoot elongation until a concentration of tissue N was reached where a new flush of growth began. Nitrogen concentrations at which new growth began were about the same for all N treatments. The time necessary to reach this concentration was dependent on the level of N added; 5 weeks for 300 ppm, 13 weeks for 150 ppm and 18 weeks for 50 ppm N. Once new growth began, tissue N concentrations began to decrease.

Open Access