scholarly journals Germination, Emergence, and Seedling Growth of Tomato and Impatiens in Response to Seed Treatment with Paclobutrazol

HortScience ◽  
2003 ◽  
Vol 38 (6) ◽  
pp. 1201-1204 ◽  
Author(s):  
Jennifer R. Still ◽  
Wallace G. Pill
Keyword(s):  
Seedling Growth ◽  
Seed Treatment ◽  
Shoot Growth ◽  
Dry Weight ◽  
Suppressive Effect ◽  
Growth Suppression ◽  
Growth Retardant ◽  
Lower Percentage ◽  
Shoot Height ◽  
Grade 5

Seed treatments with paclobutrazol (PB), a triazole growth retardant, were examined for seedling growth suppression without exerting a deleterious effect on germination or emergence. Seeds of `Salmon Picotee impatiens (Impatiens wallerana Hook f.) and `Marglobe tomato (Lycopersicon esculentum Mill.) were soaked for 24 or 48 hours at 22 °C in 0, 50, 500, or 1000 mg·L-1 PB or were primed in polyethylene glycol 8000 or grade 5 exfoliated vermiculite (both at -1.0 MPa for 7 days at 22 °C) containing these PB solutions. Any PB seed treatment of impatiens (including a series of lower concentrations up to 50 mg·L-1 PB) that elicited seedling growth suppression also reduced germination and emergence. For tomato, soaking seeds for 24 hours in up to 1000 mg·L-1 PB had little or no effect on germination or emergence, and yet shoot height or dry weight was not decreased further by exceeding 50 mg·L-1 PB. At any PB concentration, soaking seeds for 48 hours or priming seeds resulted in lower percentage of germination or emergence than soaking seeds for 24 hours. Soaking tomato seeds in 50 mg·L-1 PB for 24 hours resulted in similar shoot growth suppression until at least 31 days after planting as a growth medium drench (1 mg·L-1 PB) or as a shoot spray (10 mg·L-1 PB), both applied at 14 days after planting. Beyond 31 days after planting, however, the latter two treatments gave greater shoot growth suppression than the PB seed soak treatment, which had lost its growth suppressive effect. Chemical name used: (+)-(R*,R*)-[(4-chlorophenyl)methyl]- -(1,1,-dimethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol).

scholarly journals Emergence and Shoot Growth of Cosmos and Marigold from Paclobutrazol-treated Seed

2001 ◽  
Vol 19 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Wallace G. Pill ◽  
James A. Gunter
Keyword(s):  
Growth Medium ◽  
Shoot Growth ◽  
Dry Weight ◽  
Tagetes Patula ◽  
Shoot Height ◽  
Shoot Dry Weight ◽  
Grade 5 ◽  
Treated Seed ◽  
Emergence Percentage ◽  
And Control

Abstract This study was conducted to determine whether treating seeds of ‘Sensation Mixed’ cosmos (Cosmos bipinnatus Cav.) and ‘Bonanza Gold’ marigold (Tagetes patula L.) with paclobutrazol (PB) could suppress seedling growth. Seeds were soaked in solutions of 0, 500 or 1000 mg PB/liter (ppm PB) for 16 hours at 25C (77F) or they were primed [−0.5 MPa (−5 bars) for 7 days at 20C (68F)] in Grade 5 exfoliated vermiculite moistened with 0, 500 or 1000 ppm PB solltuions. Soaked and primed seeds were dried for 1 day at 19C (65F) and 25% relative humidity. These seeds and control (non-treated) seeds were sown into plug cells containing peat-lite. Increasing PB concentration decreased cosmos shoot height at 32 days after planting (DAP), but decreased emergence percentage, responses that were more pronounced with priming than with soaking. A 1 ppm PB growth medium drench [30 ml/cell(0.2 mg PB/cell)] and, to a greater extent a 10 mg PB/liter (ppm PB) shoot spray [2 ml/shoot (0.02 mg PB/shoot)], both applied at 10 DAP, resulted in greater cosmos shoot height suppression at 32 DAP than treatment of seeds with 1000 ppm PB. Soaking marigold seeds in 1000 ppm PB failed to decrease shoot height below those of plants from non-treated seeds at 32 DAP. However, exposure to 1000 ppm PB during priming of marigold seeds resulted in a similar shoot height suppression (13%) as the growth medium drench, and similar shoot dry weight reduction (21%) as the shoot spray. Suppression of shoot growth by this seed treatment was short-term since by five weeks after transplanting into 15 cm (6 in) pots, only marigold plants that had received the growth medium drench or shoot spray were smaller than those of control plants. Treating marigold seeds with 1000 mg ppm PB used about one-fifth the PB used to drench the growth medium.

Response of yellow poplar (Liriodendrontulipifera L.) seedling shoot growth to low concentrations of O3, SO2, and NO2

1984 ◽  
Vol 14 (1) ◽  
pp. 150-153 ◽  
Author(s):  
M. J. Mahoney ◽  
J. M. Skelly ◽  
B. I. Chevone ◽  
L. D. Moore
Keyword(s):  
Shoot Growth ◽  
Dry Weight ◽  
Shoot Elongation ◽  
Height Growth ◽  
Yellow Poplar ◽  
Shoot Height ◽  
Low Concentrations ◽  
Highly Correlated

Six-week-old yellow poplar (Liriodendrontulipifera L.) seedlings from one half-sib family were exposed to various combinations of 0.07 ppm O3, 0.06 ppm SO2, and 0.10 ppm NO2 6 h daily for 35 consecutive days. Ozone and SO2 alone did not suppress total shoot elongation compared with control seedlings after the 5-week fumigation period, whereas the combinations of O3 + SO2, SO2 + NO2, or O3 + SO2 + NO2 significantly reduced total shoot height 51, 64, and 51%, respectively. Of the pollutant combinations, SO2 + NO2 most severely inhibited the rate of height growth with this effect initially occurring after only 2 weeks of fumigation. The dry weight of seedlings exposed to O3 + SO2, SO2 + NO2, or O3 + SO2 + NO2 were significantly less than plants exposed to no pollutants, O3, or SO2. Total shoot height growth was highly correlated with seedling dry weight (r = 0.97)

Trifluralin and Triallate Retention by Imbibed Tame Oat (Avena sativa) Caryopses

Weed Science ◽  
1984 ◽  
Vol 32 (2) ◽  
pp. 251-257 ◽  
Author(s):  
Martin C. Heath ◽  
Ross Ashford ◽  
Robert B. McKercher
Keyword(s):  
Seedling Growth ◽  
Avena Sativa ◽  
Shoot Growth ◽  
Residual Activity ◽  
Dry Weight ◽  
Distilled Water ◽  
Coleoptile Length ◽  
Seed Imbibition ◽  
Shoot Dry Weight ◽  
Phytotoxic Effect

The effect of exposing tame oat (Avena sativaL. ‘Hudson’) to trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) and triallate [S-(2,3,3-trichloroallyl) diisopropylthiocarbamate] during seed imbibition was investigated in a growth cabinet at 21 C in the absence of light. Caryopses were imbibed in 0.0, 1.5, and 3.0 ppmv aqueous dilutions of trifluralin and triallate for up to 10 h, after which germination was continued in distilled water. Germination was not affected following imbibition in either herbicide. Both herbicides produced distinct visual symptoms of herbicide injury during subsequent seedling growth. Coleoptile length of 5-day-old seedlings was reduced following imbibition in a 1.5-ppmv dilution of either herbicide. Triallate at 1.5 ppmv resulted in a reduction in shoot dry weight. Both herbicides were largely excluded from embryos of imbibing caryopses. Seedlings were unaffected when cultured from embryos excised from caryopses imbibed in trifluralin and triallate dilutions. Seedling phytotoxic effects resulted from residual activity of trifluralin and triallate retained by the pericarp and testa of imbibed caryopses. Presence of the hull during imbibition decreased the phytotoxic effect of both herbicides on shoot growth. These findings suggest that germinating seedlings ofAvenaspp. may be affected by trifluralin and triallate at an earlier stage than previously realized.

Sicklepod (Cassia obtusifolia) Shoot Structure as Affected by Soybean (Glycine max) Interference

Weed Science ◽  
1993 ◽  
Vol 41 (1) ◽  
pp. 75-81 ◽  
Author(s):  
James E. Smith ◽  
Peter W. Jordan
Keyword(s):  
Glycine Max ◽  
Shoot Growth ◽  
Dry Weight ◽  
Main Stem ◽  
Relative Time ◽  
Leaf Production ◽  
Shoot Height ◽  
Early Season ◽  
Shoot Dry Weight ◽  
Number Of Leaves

Shoot growth and morphology of sicklepod responded to distance of sicklepod from the soybean row and relative time of emergence of crop and weed. Sicklepod was added to soybean as either uniform stands of 26 individuals m−2or as widely spaced individuals. Sicklepod shoot height, number of main-stem nodes, number of primary branches, and shoot dry weight were decreased at 12 wk after emergence when plants were situated closer to a soybean row. Sicklepod that emerged 7 d later than soybean were shorter statured and had fewer main-stem nodes. Virtually all sicklepod overtopped the soybean, but proximity to the soybean row or later emergence reduced shoot dry weight up to 60%. A doubling in branches originating at lower main-stem nodes on sicklepod 25 cm from the row, compared to those in the row (upper branch numbers were unchanged), was associated with a 67% increase in leaves. Sixty to 90% of lower branches reached the upper canopy and thus contributed to the number of leaves above the soybean. Early-season effects of soybean interference on sicklepod reduced lower branches and, as a consequence, leaf production above the soybean late in the season, when sicklepod has the greatest impact on soybean yield.

Rhizosphere colonization and seedling growth promotion of lodgepole pine by Bacillus polymyxa

1992 ◽  
Vol 38 (4) ◽  
pp. 303-308 ◽  
Author(s):  
F. B. Holl ◽  
C. P. Chanway
Keyword(s):  
Seedling Growth ◽  
Shoot Growth ◽  
Growth Promotion ◽  
Lodgepole Pine ◽  
Dry Weight ◽  
Root Tissue ◽  
Bacillus Polymyxa ◽  
Rhizosphere Colonization ◽  
Order Of Magnitude ◽  
Rhizosphere Population

Lodgepole pine seed was inoculated with Bacillus polymyxa isolate L6-16R, a strain marked with antibiotic resistance to 100 mg rifamycin per litre. Inoculation resulted in statistically significant seedling biomass increases after 8 weeks of pine growth. The L6-16R rhizosphere population declined by an order of magnitude per month, from ca. 106 cfu/g dry weight of pine root tissue 4 weeks past inoculation to ca. 104 cfu/g of root tissue 12 weeks past inoculation. Seed-lings from three of four pine provenances had mean shoot and root dry weight increases of up to 35% due to seed inoculation, but shoot growth of the fourth provenance was inhibited. The size of the L6-16R rhizosphere population was not correlated to the magnitude of the shoot growth response 4 weeks after inoculation, but it showed a strong correlation with shoot growth 8 weeks after inoculation. These results indicate that the promotion of pine seedling growth may be a function of the size of the bacterial rhizosphere population that develops 4 weeks after inoculation, and that B. polymyxa may promote growth of lodgepole pine collected from many, but not all provenances. Key words: Bacillus polymyxa, lodgepole pine, growth promotion, rhizosphere colonization.

scholarly journals Pear and apple pomace compost as an alternative to commercial substrates in the production of tomato seedlings

2021 ◽  
Vol 53 (1) ◽  
pp. 128-138
Author(s):  
Jorge Federico Maldonado ◽  
Marta Susana Agüero ◽  
María Belén Buglione ◽  
Facundo Iturmendi ◽  
Marcela Viviana Filippi ◽  
...  
Keyword(s):  
Seedling Growth ◽  
Renewable Resources ◽  
Dry Weight ◽  
Apple Pomace ◽  
Tomato Seedling ◽  
Shoot Height ◽  
Tomato Seedlings ◽  
Shoot Dry Weight ◽  
Survival Percentage ◽  
In Cells

It is important to look for alternative substrates to replace non-renewable resources such as peat used in growing media in horticulture. The aim of this work was to evaluate if the compost of pear and apple pomace could be used as an alternative to a commercial substrate for the production of tomato seedlings. Two experiments were carried out on trays with alveoli of 100 cm3 (experiment 1) and 30 cm3 (experiment 2). In experiment 1, three substrates were used: commercial substrate (CS), mixture of CS and pomace compost (CS+C) and pure compost (C). In experiment 2 a fourth treatment with a mixture of compost and perlite (C+P) was incorporated. The obtained results indicate that the development of the seedlings using CS+C and CS as a substrate was similar in cells of 100 cm3 and higher in cells of 30 cm3. In addition, the growth of seedlings on C+P in relation to CS showed similar or higher values in some variables. These results indicate that it would be feasible to replace the use of non-renewable resources such as peat in the production of tomato seedlings by a product obtained from a residue. Tomato seedling growth was evaluated on trays with 100 cm3 alveoli and 30 cm3 alveoli on different substrates mixtures: commercial substrate (CS), mixture of CS and pomace compost (CS+C), pure compost (C) and mixture of compost and perlite (C+P). Highlights Seedling development using CS+C and CS as substrates was similar in cells of 100 cm3 and higher in cells of 30 cm3. Seedling growth on C+P in relation to CS, showed similar or higher values for some variables such as root dry weight, shoot dry weight, stem diameter and shoot height. In 30 cm3 cell trays of the compost and perlite treatment (3:1 v/v), obtained seedling quality would enable a high post-transplant survival percentage. Pear and apple pomace compost may be an alternative to a commercial substrate containing peat for tomato seedlings production (Lycopersicon esculentum Mill.).

scholarly journals In vitro Effect of Caesalpinia sappan and Crateva magna Extracts in Enhancing Seed Germination and Seedling Growth of KDML105 Rice Variety

2021 ◽  
Author(s):  
Arom Jantasorn ◽  
Ponpawit Pongsupap ◽  
Thanaprasong Oiuphisittraiwat
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Seed Treatment ◽  
Growth Parameters ◽  
Dry Weight ◽  
Rice Seedling ◽  
Rice Seed ◽  
Caesalpinia Sappan ◽  
Vigor Index ◽  
Vitro Effect

Background: Rice (Oryza sativa L.) is a major cereal crops planted in Thailand for both local consumption and export. The objective of this study was to investigate the allelopathic effect of Caesalpinia sappan L. and Crateva magna (Lour.) DC. extracts in promoting a rice cultivar, Khao Dowk Mali 105 (KDML105) seed germination and seedling growth, at 7 and 14 days after sowing (DAS). Methods: The C. sappan and C. magna plants were cleaned with tap water and air dried in room temperature then cut into small pieces and ground into fine powder. Plant crude extracts was prepared using ethanol as solvent. Result: The results showed that rice seed treatment with C. sappan and C. magna extracts was significant (all p less than 0.05), increasing root length, shoot fresh and dry weight and root fresh and dry weight of rice seedlings at 14 DAS. Seed treatment with these two plant extracts led to a significantly greater vigor index of the KDML105 rice seedling cultivar, when compared with the control. Interestingly, the seed treatment with C. magna extract at a 100 ppm concentration was found to produce the highest enhancement in the overall rice seedling growth parameters, including the vigor index of seedlings. The results showed that a low concentration of C. magna extracts can be potentially used in promoting seedling growth of rice since they improved the overall growth parameters. 

scholarly journals Evaluating Chemical Indices of Growing Media for Nursery Production of Quercus rubra Seedlings

HortScience ◽  
2006 ◽  
Vol 41 (5) ◽  
pp. 1342-1346 ◽  
Author(s):  
K. Francis Salifu ◽  
Michael A. Nicodemus ◽  
Douglass F. Jacobs ◽  
Anthony S. Davis
Keyword(s):  
Seedling Growth ◽  
Quercus Rubra ◽  
Dry Weight ◽  
N Fertilization ◽  
Pine Bark ◽  
Northern Red Oak ◽  
High Nitrogen ◽  
Shoot Height ◽  
Nursery Production ◽  
Antagonistic Interactions

We evaluated suitability of chemical indices of three media formulations or substrates (A, B, and C) consisting of composted pine bark, coconut coir pith, sphagnum peatmoss, processed bark ash, and perlite in varied proportions for growing northern red oak (Quercus rubra L.) seedlings. These substrates were ranked according to their ability to promote seedling growth. The low-yielding substrate (A) was devoid of pine bark and perlite and the medium-yielding substrate (B) contained no peatmoss or processed bark ash. The high-yielding substrate (C) contained all components. Additionally, we tested plant response to high nitrogen (N) fertilization on each substrate. Media EC, pH, and total dissolved solids measured at transplanting explained 68%, 43%, and 66%, respectively, of the variation in plant dry weight and 39%, 54%, and 46%, respectively, of the variation in shoot height. Vector diagnosis effectively ranked nutritional limitations on seedling growth as N > P > K. High N fertilization highlighted element deficiency in seedlings grown on substrate A, but resulted in element toxicity and antagonistic interactions in plants established on substrates B and C, respectively.

scholarly journals Promotive Effects of DCPTA on Seedling Development and Growth of Radish

1992 ◽  
Vol 117 (2) ◽  
pp. 294-297 ◽  
Author(s):  
J.H. Keithly ◽  
H. Yokoyama ◽  
H.W. Gausman
Keyword(s):  
Seedling Growth ◽  
Seed Treatment ◽  
Actinomycin D ◽  
Nuclear Gene ◽  
Dry Weight ◽  
Seedling Development ◽  
Seedling Vigor ◽  
Nuclear Gene Expression ◽  
Significant Linear Correlation ◽  
Alpha Amanitin

A radish (Raphanus sativus L. cv. Scarlet turnip white tipped) seedling growth test was developed to examine promotive effects of 2-(3,4-dichlorophenoxy) triethylamine (DCPTA) on seedling vigor and plant development. Compared with controls, seed treatment using 30 μm DCPTA significantly (P = 0.05) enhanced the rates of root and hypocotyl elongation and seedling dry weight. Enhanced hypocotyl development by DCPTA showed a significant linear correlation (r = 0.83) with the increased taproot yield of mature plants grown from DCPTA-treated seeds. The harvestable taproot yield and harvest index of plants grown from seeds treated with 30 μm DCPTA were increased 109% and 38%, respectively, as compared with controls. Incubation of radish seeds in 30 μm DCPTA with actinomycin-D, alpha-amanitin, amisomycin, or cordycepin significantly reduced DCTPA-mediated seedling growth. These results indicate that nuclear gene expression and translation of mRNA on 80S ribosomes are required for the acceleration of seedling development by DCPTA.

IMPACT OF FERTILIZERS APPLICATION ON SEED GERMINATION AND SEEDLING GROWTH OF VIGNA RADIATA

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
SUPRIYA DIXIT ◽  
R. K. GUPTA
Keyword(s):  
Seed Germination ◽  
Leaf Area ◽  
Seedling Growth ◽  
Vigna Radiata ◽  
Agricultural Research ◽  
Dry Weight ◽  
Fertilizer Application ◽  
Research Field ◽  
Chemical Fertilizer ◽  
Seedling Length

Currently, a real challenge for the workers in the agricultural research field is to stop or reduce the use of expensive agrochemicals/ chemical fertilizers which are hazardous to the environment as well as human health. Present study was aimed to improve the growth and obtain optimum yield of Vigna crop with eco-friendly, non-toxic way and to reduce the use of agrochemical/chemical fertilizer application in agricultural activities. A pot experiment was conducted to study the effect of chemical fertilizer (DAP) and biofertilizer ( Rhizobium strain) separately and in combination on seed germination and seedling growth (at 30 days) based on morphological parameters such as seedling length (cm), fresh weight (g), dry weight (g) and leaf area (cm)2 of Vigna radiata (L.) Wilczek. After one month (30 Days) observations, it was found that seedling length, fresh and dry weights and leaf area were maximum in T4 and minimum in T15, T7 and T8 favored improved seedling length and leaf area whereas T7, T8, and T9 favored improved fresh and dry weights as compared to control.

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