Structures related to jasmonic acid and their effect on lettuce seedling growth

1975 ◽  
Vol 23 (5) ◽  
pp. 835-838 ◽  
Author(s):  
Uzi. Ravid ◽  
Raphael. Ikan ◽  
Roy M. Sachs
Keyword(s):  
Jasmonic Acid ◽  
Seedling Growth ◽  
Lettuce Seedling

Relative phytotoxicity of parthenium weed (Parthenium hysterophorus L.) residues on the seedling growth of a range of Australian native and introduced species

2018 ◽  
Vol 69 (8) ◽  
pp. 837 ◽  
Author(s):  
Boyang Shi ◽  
Steve Adkins
Keyword(s):  
Seedling Growth ◽  
Invasion Success ◽  
Parthenium Hysterophorus ◽  
Grass Species ◽  
Pasture Grass ◽  
Lettuce Seedling ◽  
Non Invasive ◽  
Significant Difference ◽  
Phytotoxic Effect ◽  
Parthenium Weed

The invasive herbaceous species Parthenium hysterophorus L. (Asteraceae), commonly known as parthenium weed has rapidly become a significant weed in more than 30 countries. Parthenium weed litter taken from the introduced biotypes was relatively more phytotoxic than that taken from biotypes coming from the native range when tested on lettuce and this may indicate one reason for invasion success. However, no significant difference was observed in phytotoxicity to lettuce seedling growth when two Australian biotypes of parthenium weed were compared, one invasive and one non-invasive, indicating that invasiveness was not associated with litter phytotoxicity in all cases. Residue from the invasive parthenium weed biotype had a greater phytotoxic effect upon Australian native pasture grass species relative to the introduced pasture grass species with buffel grass (Cenchrus ciliaris L.) and bull Mitchell grass (Astreble sequarrosa C.E.Hubb) showing the greatest tolerance to parthenium weed phytochemicals. When compared with residue taken from plants that has a range of phytotoxic capacity, parthenium weed residue was considered to be only moderately phytotoxic suggesting that the phytotoxicity of its residue may not be the main reason for the plants invasive trait.

LETTUCE SEEDLING GROWTH ON SUBSTRATE MIXES USING PEAT, CORK, FOREST LITTER AND SAND

1993 ◽  
pp. 167-174
Author(s):  
M. Martorell ◽  
M. Soliva ◽  
N. Cañameras ◽  
F.X. Martínez ◽  
M. dos Reis
Keyword(s):  
Seedling Growth ◽  
Forest Litter ◽  
Lettuce Seedling

scholarly journals Efficiency of biocompost potentiated with chemical fertilizer and facilitated aeration

2020 ◽  
Vol 42 ◽  
pp. e31
Author(s):  
Guilherme Junqueira Jerônimo ◽  
Ana Paula Milla dos Santos Senhuk ◽  
Mário Sérgio da Luz ◽  
Julio Cesar de Souza Inácio Gonçalves ◽  
Deusmaque Carneiro Ferreira
Keyword(s):  
Seedling Growth ◽  
Food Industry ◽  
Organic Waste ◽  
Nutrient Content ◽  
Chemical Fertilizer ◽  
Natural Conditions ◽  
Stabilization Time ◽  
Lettuce Seedling

The aims were to reduce composting time, to evaluate the application of produced composts and to size two composting yards (conventional and potentiated). Eight compost heaps with 400 kg of food industry or urban organic waste were built: 1) control; 2) facilitated aeration; 3) potentiated with facilitated aeration and chemical fertilizer; and 4) chemical fertilizer. The analyzed parameters were pH, temperature, humidity and C/N ratio. Compost heap reached stabilization at 90 days without chemical fertilizer and at 25 days when potentiated, regardless of the waste origin. Stabilized composts were applied to lettuce crop under natural conditions and compared with commercial compost. Composts with chemical fertilizer were the most effective in enabling lettuce seedling growth. For medium-sized cities, the conventional composting yard requires 6.58 ha, whereas the potentiated composting yard requires 1.69 ha, considering the recorded stabilization time of 90 and 25 days, respectively. The potentiated composting was the most efficient because its shorter stabilization time, did not require manual turning and produced compost with higher nutrient content. Besides that, requires an area 74.32% smaller than the conventional yard, fact that enables using this process to treat industrial and urban solid organic waste.

scholarly journals Mathematical Modeling of Allelopathy. III. A Model for Curve-Fitting Allelochemical Dose Responses

2003 ◽  
Vol 1 (1) ◽  
pp. 154014203908444 ◽  
Author(s):  
De Li Liu ◽  
Min An ◽  
Ian R. Johnson ◽  
John V. Lovett
Keyword(s):  
Seedling Growth ◽  
Tall Fescue ◽  
Good Description ◽  
Poa Pratensis ◽  
Lolium Multiflorum ◽  
Kentucky Bluegrass ◽  
Lettuce Seedling ◽  
Red Fescue ◽  
Wide Range ◽  
Dose Responses

Bioassay techniques are often used to study the effects of allelochemicals on plant processes, and it is generally observed that the processes are stimulated at low allelochemical concentrations and inhibited as the concentrations increase. A simple empirical model is presented to analyze this type of response. The stimulation-inhibition properties of allelochemical-dose responses can be described by the parameters in the model. The indices, p% reductions, are calculated to assess the allelochemical effects. The model is compared with experimental data for the response of lettuce seedling growth to Centaurepensin, the olfactory response of weevil larvae to α-terpineol, and the responses of annual ryegrass ( Lolium multiflorum Lam.), creeping red fescue ( Festuca rubra L., cv. Ensylva), Kentucky bluegrass ( Poa pratensis L., cv. Kenblue), perennial ryegrass ( L. perenne L., cv. Manhattan), and Rebel tall fescue ( F. arundinacea Schreb) seedling growth to leachates of Rebel and Kentucky 31 tall fescue. The results show that the model gives a good description to observations and can be used to fit a wide range of dose responses. Assessments of the effects of leachates of Rebel and Kentucky 31 tall fescue clearly differentiate the properties of the allelopathic sources and the relative sensitivities of indicators such as the length of root and leaf.

Lettuce seedling growth: Antagonism between gibberellic acid and Niacin

1971 ◽  
Vol 27 (10) ◽  
pp. 1163-1164 ◽  
Author(s):  
Prakash Mullick ◽  
U. N. Chatterji
Keyword(s):  
Gibberellic Acid ◽  
Seedling Growth ◽  
Lettuce Seedling

scholarly journals MORPHOMETRIC CHANGES AND POST-PLANTING GROWTH AS A RESPONSE TO HARDENING ON Tabebuia roseo-alba SEEDLINGS

FLORESTA ◽  
2021 ◽  
Vol 51 (3) ◽  
pp. 539
Author(s):  
Danielle ACCO Cadorin ◽  
Ubirajara Contro Malavasi ◽  
Marlene De Matos Malavasi ◽  
João Alexandre Lopes Dranski ◽  
Pablo Wenderson Ribeiro Coutinho
Keyword(s):  
Jasmonic Acid ◽  
Seedling Growth ◽  
Electrolyte Leakage ◽  
The Other ◽  
Dry Biomass ◽  
Stem Bending ◽  
Test Treatments ◽  
Root Tissues

The essay evaluated morphometric changes in response to stem bending and jasmonic acid on Tabebuia roseo-alba (Ridl). Sand. seedlings. We tested 20 daily stem bendings and applications of 1 μmol L-1 of jasmonic acid for 4 or 8 weeks. Stem bending for 8 weeks resulted in seedlings with fewer leaves and smaller shoot dry biomass compared to seedlings subjected to the other treatments. The results of electrolyte leakage from root tissues of control seedlings showed higher value compared to results from seedlings subjected to the test treatments. After planting, we did not detect differences in height and diameter increments from seedlings subjected to the test treatments. Therefore, hardening methods did not improve post-planting seedling growth.

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