scholarly journals Effects of Plant Growth Regulators on Sturdiness of Jack Pine Seedlings

1996 ◽  
Vol 14 (4) ◽  
pp. 228-230 ◽  
Author(s):  
Jeffrey P. Schnurr ◽  
Zong-Ming Cheng ◽  
Arthur A. Boe
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Growth Regulators ◽  
Pinus Banksiana ◽  
Weight Ratio ◽  
Dry Weight ◽  
Jack Pine ◽  
Growth Characteristics ◽  
Pine Seedlings ◽  
Growth Modification

Abstract Seven growth regulators (ancymidol, 6-benzylaminopurine, ethephon, flurprimidol, mefluidide, paclobutrazol, and uniconizole) at various concentrations were studied for their effects on sturdiness of greenhouse grown seedlings of jack pine (Pinus banksiana Lamb.), measured by a single parameter, growth modification index. All growth regulators at certain concentrations were effective in reducing plant height but none increased stem caliper. Several growth regulators increased shoot-to-root dry weight ratio. Benzylaminopurine greatly modified growth characteristics and resulted in deformed seedlings. Uniconizole was most promising for producing sturdier seedlings of jack pine.

scholarly journals Susceptibility in the Growth of Viola tricolor `Blue' to Plant Growth Regulators and Fish Emulsion

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 852D-852
Author(s):  
Sabrina L. Shaw ◽  
William F. Hayslett ◽  
Eddie B. Williams
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Dry Weight ◽  
Fresh Weight ◽  
Visual Appearance ◽  
Top Dry Weight ◽  
Viola Tricolor

A one-time application of fish emulsion 2 days before the application of plant growth regulators (PGR) showed an overriding effect on the growth of pansies. Blue/blotch shades of `Medallion' pansies were placed on a constant feed program of 100 ppm Peat Lite 20N–10P–20K, with half of the pansies receiving an additional one-time supplement of fish emulsion. PGRs and rates included B-Nine, 0.5% (used as the control); uniconazole, 2 and 4 ppm; and paclobutrazol, 16 and 25 ppm. Parameters taken included plant height, top fresh weight, top dry weight, days to anthesis, and visual appearance. Significant differences were noted in the plants receiving the supplement for plant dry weight, plant height, and visual appearance. Plants receiving fish emulsion grew taller and denser than those on constant feed alone despite the effects of the PGRs.

scholarly journals Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

2015 ◽  
Vol 25 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Amir Rezazadeh ◽  
Richard L. Harkess
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Plant Height ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Stem Elongation ◽  
Dry Weight ◽  
Maximum Height ◽  
Height Control ◽  
Leaf Dry Weight

Purple firespike (Odontonema callistachyum), native to Central America, has potential for use as a new flowering potted plant. The effects of number of pinches (zero, one, or two) and number of cuttings (one, two, or three) per 6-inch pot were evaluated on the control of plant height. Plant height was suppressed as the pinch number increased. The greatest reduction was recorded with one cutting per pot and two pinches. The maximum number of branches per pot was recorded with two pinches and three cuttings per pot. In a second experiment, plant growth regulators (PGR) were also tested for efficacy of height control; 2 weeks after pinching, foliar sprays of paclobutrazol, flurprimidol, daminozide, chlormequat, and a tank-mix of daminozide + chlormequat or media drenches of paclobutrazol, uniconazole, or flurprimidol were applied. Plant height, leaf area, and leaf dry weight were recorded at 3, 6, and 9 weeks after PGR application. Maximum height control was obtained with uniconazole drench at 8 ppm, resulting in plants 22 cm tall, 61% shorter than the untreated control (56 cm); however, it resulted in severe leaf distortion. Plant height was 56% and 46% shorter than the control using drenches of paclobutrazol at 30 ppm and flurprimidol at 15 ppm, respectively. Daminozide spray at 2000 ppm and tank-mix of daminozide + chlormequat at 4500/1500 ppm suppressed stem elongation by 20.3% and 19%, respectively. Plants treated with paclobutrazol drench at 30 ppm reduced leaf area and leaf dry weight compared with other PGRs. Chlormequat spray at tested concentrations was ineffective for controlling firespike plant growth. The most attractive potted plants were produced using a drench application of paclobutrazol at 10 or 15 ppm.

scholarly journals EFFECT OF GROWTH REGULATORS ON TWO PYRACANTHA COCCINEA CULTIVARS

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 850c-850
Author(s):  
Janet C. Henderson ◽  
Thomas H. Nichols
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Plant Height ◽  
Growth Regulators ◽  
Foliar Application ◽  
Dry Weight ◽  
Soil Drench ◽  
Pyracantha Coccinea

Pyracantha coccinea `Lalandei' and `Kasan' were treated with a foliar application of 25, 50 or 100 mg/l uniconazole, 3000 mg/l chlormequat, a soil drench of 0.25, 0.50 or 1.00 mg/container of uniconazole, or 30 mg/container chlormequat. Heights of plants receiving foliar applications of uniconazole were significantly lower than untreated plants in both cultivars. Uniconazole soil drenches also reduced plant height in both cultivars, but differences were not apparent until 8 weeks after treatment. Chlormequat treatments had little effect on plant growth. At harvest, stem dry weight was significantly lower in both cultivars with uniconazole soil drenches and in `Lalandei' treated with 50 and 100 mg/1 and in `Kasan' treated with 100 mg/1 as a foliar application. There was also a tendency for leaf area to increase with uniconazole foliar applications.

scholarly journals Persistent Effects of Plant Growth Regulators on Landscape Performance of Seed Geraniums

1994 ◽  
Vol 12 (3) ◽  
pp. 150-154
Author(s):  
Joyce G. Latimer ◽  
Sherrod A. Baden
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Dry Weight ◽  
Stem Length ◽  
Shoot Dry Weight ◽  
Landscape Performance ◽  
Reduced Height ◽  
Time Required

Abstract In 1988, spray applications of 3.5 or 7 ppm paclobutrazol, 1500 ppm chlormequat, or 200 ppm ancymidol were applied to seed geraniums (Pelargonium x hortorum L. H. Bailey ‘Ringo White’ and ‘Ringo Rose’) to determine effects on growth in the greenhouse and the subsequent growth and performance of treated plants in the landscape. All growth retardants reduced stem length and shoot dry weight as well as time required for flowering, while branching was increased relative to the untreated plants. Flowering in the landscape was increased by all growth regulator treatments at 4 weeks after planting but was generally not different from the untreated plants at 6 weeks after planting. Plant height and width were reduced by all treatments for both cultivars, relative to untreated plants, at 4 weeks after planting. However, only 7 ppm paclobutrazol reduced height and width of ‘Ringo White’ plants at 6 weeks after planting. Plant height, but not width, was reduced by all treatments for ‘Ringo Rose’ at 6 weeks after planting. In 1989, seedlings of ‘Ringo Rose’ were treated with 3.5, 7, 16, 40, or 80 ppm paclobutrazol or 1500 ppm chlormequat or 200 ppm ancymidol. Seedling growth was excessively reduced by 40 or 80 ppm paclobutrazol. Time required for flowering was not reduced by growth regulators in 1989. Landscape performance under conditions of excess rain was not improved by plant growth regulators and the height of plants treated with 16, 40 or 80 ppm paclobutrazol was still less than that of the untreated plants at 12 weeks after planting. Only chlormequat controlled plant growth in the greenhouse without delaying the resumption of growth in the landscape.

scholarly journals Efeito da adubação orgânica e mineral no crescimento de plantas de orégano cultivadas em ambiente protegido

2015 ◽  
Vol 10 (2) ◽  
pp. 08-13
Author(s):  
Vanuze Costa de Oliveira ◽  
Anacleto Ranulfo dos Santos ◽  
Girlene Santos de Souza
Keyword(s):  
Plant Height ◽  
Dry Matter ◽  
Weight Ratio ◽  
Mineral Fertilizer ◽  
Dry Weight ◽  
Growth Characteristics ◽  
Mineral Fertilizers ◽  
Dry Matter Yield ◽  
Leaf Weight Ratio ◽  
Leaf Weight

O orégano é uma das plantas aromáticas e condimentares mais utilizadas no Brasil e a maior parte do produto consumido é proveniente de importação, mesmo o País apresentando condições de clima e solo favoráveis para o cultivo desta erva.  Este trabalho teve como objetivo avaliar o efeito da adubação orgânica e mineral em plantas de orégano cultivado sob malha colorida. Foi adotado o esquema fatorial 4x4 (sendo quatro ambientes de luz modificada e quatro fontes de nutrientes: Latossolo Amarelo, esterco bovino, composto orgânico e NPK), adotou-se o DIC com seis repetições. Avaliaram-se as seguintes características de crescimento: altura das plantas, produção de massa seca e razão de peso foliar. Constatou-se que as plantas adubadas com esterco bovino obtiveram maior altura e maior produção de massa seca; e as plantas cultivadas no ambiente protegido pela malha azul tiveram maior altura, massa seca de raiz e massa seca total.Effect of organic and mineral fertilizers in growth of oregano's plants grown in protected environmentAbstract: The oregano is one of aromatic and spice plants most used in Brazil and the more part of the to consumption comes from imports, even the Country presenting favorable conditions of soil and climate for growing this herb. This study aimed to evaluate the effect of organic and mineral fertilizer in oregano plants cultivated under colored mesh. It was adopted a factorial scheme 4x4 (four modified light environments and four sources of nutrients: Oxisol, bovine manure, organic compound and NPK), was adopted the DIC with six replications. We evaluated the following growth characteristics: plant height, dry matter yield and leaf weight ratio. We evaluated the following growth characteristics: plant height, dry matter yield and leaf weight ratio. It was found that plants fertilized with bovine manure had presented greater height and higher production of dry matter; and plants grown under blue net had greater height, root dry weight and total dry mass.

scholarly journals PLANT GROWTH MODIFICATION AND WATER USE OF HIBISCUS ROSA-SINENSIS `BRILLIANT' PLANTS BY UNICONAZOLE WITH VARIOUS COMBINATIONS OF PLANT GROWTH REGULATORS.

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1125e-1125
Author(s):  
L.G. Sanabria ◽  
S.E. Newman
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Plant Growth Regulators ◽  
Water Use ◽  
Growth Regulators ◽  
Height Reduction ◽  
Hibiscus Rosa Sinensis ◽  
Diffusive Resistance ◽  
Growth Modification

Various uniconazole (Sumagic™) rates were either sprayed or drenched alone or in combination with 6-BA and GA4+7 (Promalin™) or dikegulac-sodium (Atrinal™) on Hibiscus rosa-sinensis `Brilliant'. The rates of uniconazole were 0, 5, 10, and 15 mg a.i./L; 6-BA and GA4+7, 25 mg a.i./L each; and dikegulac-sodium 1000 mg a.i./L.Plant height was reduced by uniconazole when drenched at rates as low as 5 mg/L and 15 mg/L when sprayed. Dikegulac-sodium slightly counteracted the effects of uniconazole. Uniconazole activity was increased when either sprayed or drenched with application of 6-BA and GA4+7 resulting in greater height reduction.Transpiration and stomatal diffusive resistance of plants drenched with uniconazole alone was erratic; however, when uniconazole was sprayed or drenched and mixed with 6–BA and GA4+7 or dikegulac-sodium transpiration increased.

scholarly journals 863 PB 542 SENSITIVITY OF ARTEMISININ YIELD FROM SWEET WORMWOOD (ARTEMISIA ANNUA) TO CHANGES IN CULTURAL PRACTICES

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 557c-557
Author(s):  
Clint C. Shock ◽  
Erik B. G. Feibert ◽  
Monty Saunders
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Weight Ratio ◽  
Growth And Yield ◽  
Total Biomass ◽  
Leaf Yield ◽  
Harvest Timing ◽  
Artemisinin Content

Sweet worm wood is a source of the anti-malarial plant secondary compound artemisinin. The effects of water stress, nitrogen rates, plant growth regulators, and harvest timing on vegetative growth and yield of artemisinin were tested in separate experiments. In the harvest timing trial, total biomass, leaf yield, leaf artemisinin content and total artemisinin yield increased during the season. The wettest treatment tested decreased the total plant dry to fresh weight ratio, but had no effect on height, total biomass, leaf yield, leaf artemisinin content and artemisinin yield. Nitrogen fertilization increased plant height, but had no effect on total biomass, leaf yield, leaf artemisinin content and artemisinin yield. The plant growth regulators decreased plant height, increased total biomass, but had no effect on leaf yield, leaf artemisinin content and artemisinin yield. The effects of chemical weed control and post-harvest leaf drying will also be discussed.

scholarly journals BRANCHING AND VEGETATIVE GROWTH MODIFICATION OF PHOTINIA X FRASERI WITH EXOGENOUS PLANT GROWTH REGULATORS

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 850b-850
Author(s):  
Allen D. Owings ◽  
Steven E. Newman
Keyword(s):  
Plant Growth ◽  
Plant Height ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Growth Index ◽  
Application Rate ◽  
Application Rates ◽  
Growth Modification ◽  
Photinia X Fraseri ◽  
Lateral Branches

Four rates of seven plant growth regulators were foliar-applied to 11.4 liter containers of Photinia × fraseri after initial root establishment. Growth regulators studied were uniconazole, paclobutrazol, dikegulac-sodium, ancymidol, 6-BA, GA4+7 and, 6-BA + GA4+7. Six months after application, plant height, plant width, growth index, and number of lateral and terminal branches were recorded. Applications of uniconazole (30 mg a.i./liter), 6-BA alone or in combination with GA4+7, and dikegulacsodium stimulated lateral branching. The number of lateral branches increased linearly as paclobutrazol rates increased from 60 to 180 mg a.i./liter. Growth index decreased with increasing application rates of uniconazole and paclobutrazol, while the growth index of photinia treated with other growth regulators wasn't affected by application rate. Plant height was increased in GA4+7 treated plants.

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