Effect of light intensity on root growth, mycorrhizal infection and phosphate uptake in onion (Allium cepa L.)

1988 ◽  
Vol 111 (2) ◽  
pp. 183-186 ◽  
Author(s):  
C. L. Son ◽  
F. A. Smith ◽  
S. E. Smith
Keyword(s):  
Light Intensity ◽  
Root Growth ◽  
Allium Cepa ◽  
Phosphate Uptake ◽  
Mycorrhizal Infection ◽  
Allium Cepa L ◽  
Effect Of Light

Phosphate Uptake and Arbuscular Activity in Mycorrhizal Allium cepa L.: Effects of Photon Irradiance and Phosphate Nutrition

1990 ◽  
Vol 17 (2) ◽  
pp. 177 ◽  
Author(s):  
SE Smith ◽  
V Gianinazzi-Pearson
Keyword(s):  
Allium Cepa ◽  
Trypan Blue ◽  
Phosphate Uptake ◽  
Blue Staining ◽  
Mycorrhizal Infection ◽  
Active Infection ◽  
Tetrazolium Chloride ◽  
Trypan Blue Staining ◽  
Allium Cepa L ◽  
Mycorrhizal Plants

The effect of photon irradiance on phosphate uptake and growth of onion plants was investigated in an experiment aimed at determining whether development and activity of mycorrhizal infection and arbuscules are linked to physiological effects. Mycorrhizal (inoculated with Glomus mosseae (Nicol. & Gerd.) Gerdemann & Trappe) and non- mycorrhizal plants of Allium cepa. L. were grown at three soil phosphate levels and two photon irradiances (410 and 190 �mol m-2 s-1). There was one harvest at 6 weeks. Data were obtained for phosphate uptake (specific uptake rate), plant growth and mycorrhizal infection (total and active infection by trypan blue staining and succinate dehydrogenase (SDH) activity respectively). There was a positive growth response to mycorrhizal infection at the lower P levels (P0 and P1) but not at P2 with high irradiance. This response was smaller at low irradiance. Furthermore, data for root/shoot and fresh-weight/dry-weight ratios indicated that allocation of dry matter was altered in mycorrhizal plants in accord with their increased demand for photosynthate. Reduced irradiance was associated with lower rates of P uptake in all treatments, with the greatest effect in mycorrhizal plants at P0 and P1. These reductions were not associated with reductions in incidence or intensity of mycorrhizal infection nor in the development of arbuscules. At P2 the incidence of infection was reduced under low irradiance, but development of arbuscules within infected regions of the roots remained the same as in other treatments. The use of nitroblue tetrazolium chloride as a vital stain for SDH activity showed that during the 6-week period of the experiment, all the infection revealed by trypan blue staining was physiologically active. Branched arbuscules (counted in freehand sections of fresh roots) always had SDH and alkaline phosphatase activity. Thus, in young plants, observations of arbuscules gives a good indication of the amount of active infection. This may not be so in older roots.

scholarly journals Phyto-toxic Influence of an Atrazine-based Selective Herbicide – Arda-force® on Onions (Allium cepa L)

2020 ◽  
pp. 40-46
Author(s):  
Doris Fovwe Ogeleka ◽  
Esther Obasi
Keyword(s):  
Root Growth ◽  
Growth Inhibition ◽  
Allium Cepa ◽  
Environmental Protection Agency ◽  
Toxic Effects ◽  
Root Growth Inhibition ◽  
Allium Cepa L ◽  
Test Concentration ◽  
Maximum Root ◽  
Selective Herbicide

Introduction: The constant impact on the environment occasioned by pollution, indiscriminate application of agricultural chemicals, security challenges and crisis in the Niger Delta ecological area of Nigeria has caused severe damage to plants, soil organisms and humans. Aim and Methodology: In this research, onions (Allium cepa L) was exposed to varying concentrations of an atrazine-based selective herbicide Arda-force® to estimate the phyto-toxic effects on the plant species using the Organization for Economic Co-operation and Development, (OECD) protocol #208. Results: The mean effective concentration (EC50) using root growth inhibition produced indications of phyto-toxicity to the exposed species at a concentration of 0.55 ± 0.06 mg/L. Similarly, the maximum root growth inhibition efficiency relative to the control was 65% as recorded in the highest test concentration of 1.25 mg/L. Discussion: The study indicated that constant application / indiscriminate use of the herbicide Arda-force® could cause deleterious influence on these plant and vegetable species, daily consumed by humans as a rich source of anti-oxidants. Conclusion: This study concluded that atrazine-based herbicide Arda-force® used in this assessment resulted in phyto-toxic effects to Allium cepa L. At the exposed concentrations of the herbicide to non-target specie – Allium cepa L. that are integral parts of the ecosystems, the ‘‘harmless’’ status of atrazine acclaimed by the United State Environmental Protection Agency (USEPA) is still very much in doubt.

Relationship between apoplastic ascorbate regeneration and the stimulation of root growth in Allium cepa L.

Plant Science ◽  
1994 ◽  
Vol 100 (1) ◽  
pp. 23-29 ◽  
Author(s):  
JoséA. González-Reyes ◽  
Francisco J. Alcaín ◽  
JoséA. Caler ◽  
Antonio Serrano ◽  
Francisco Córdoba ◽  
...  
Keyword(s):  
Root Growth ◽  
Allium Cepa ◽  
Allium Cepa L ◽  
Ascorbate Regeneration ◽  
Stimulation Of

Inhibition Effect on the Allium cepa L. Root Growth When Using Hexavalent Chromium-Doped River Waters

2009 ◽  
Vol 82 (6) ◽  
pp. 767-771 ◽  
Author(s):  
F. R. Espinoza-Quiñones ◽  
N. Szymanski ◽  
S. M. Palácio ◽  
A. N. Módenes ◽  
M. A. Rizzutto ◽  
...  
Keyword(s):  
Root Growth ◽  
Hexavalent Chromium ◽  
Allium Cepa ◽  
River Waters ◽  
Inhibition Effect ◽  
Allium Cepa L

scholarly journals Correlation between heavy metal ions (copper, zinc, lead) concentrations and root length of Allium cepa L. in polluted river water

2005 ◽  
Vol 48 (spe) ◽  
pp. 191-196 ◽  
Author(s):  
Soraya Moreno Palacio ◽  
Fernando Rodolfo Espinoza-Quiñones ◽  
Raquel Manozzo Galante ◽  
Dilcemara Cristina Zenatti ◽  
Araceli Aparecida Seolatto ◽  
...  
Keyword(s):  
Root Growth ◽  
River Water ◽  
Allium Cepa ◽  
Heavy Metal Ions ◽  
Polluted River ◽  
Allium Cepa L ◽  
Copper Zinc ◽  
The Common ◽  
Concentration Levels ◽  
Common Onion

The present work was performed using the common onion (Allium cepa L.) as a bioindicator of toxicity of heavy metals in river water. The test waters were collected at two sampling sites: at the beginning and the end of the Toledo River. The bulbs of A. cepa L. were grown in test water with nine concentration levels of copper, zinc and lead from 0.1 to 50 ppm. In the laboratory, the influence of these test liquids on the root growth was examined during five days. For test liquids containing below 0.03-ppm dissolved Cu the root growth was reduced by 40% However, the same reduction occurred for 1-ppm dissolved Zn. For dissolved Pb, results reveal toxicity above 0.1 and 0.6 ppm at the beginning and the end of the Toledo river water, respectively.

scholarly journals Cyanamide mode of action during inhibition of onion (Allium cepa L.) root growth involves disturbances in cell division and cytoskeleton formation

Planta ◽  
2011 ◽  
Vol 234 (3) ◽  
pp. 609-621 ◽  
Author(s):  
Dorota Soltys ◽  
Anna Rudzińska-Langwald ◽  
Wojciech Kurek ◽  
Agnieszka Gniazdowska ◽  
Elwira Sliwinska ◽  
...  
Keyword(s):  
Cell Division ◽  
Root Growth ◽  
Allium Cepa ◽  
Mode Of Action ◽  
Allium Cepa L
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