The effect of growth temperature on dry weight and carbohydrate content of onion (Allium cepa L. cv. Creamgold) bulbs

1982 ◽  
Vol 33 (3) ◽  
pp. 559 ◽  
Author(s):  
BT Steer
Keyword(s):  
Allium Cepa ◽  
Growth Temperature ◽  
Dry Weight ◽  
Carbohydrate Content ◽  
Controlled Environment ◽  
Fresh Weight ◽  
Tissue Water ◽  
Total Carbohydrate ◽  
Glucose Content ◽  
Allium Cepa L

Onion bulbs (Allium cepa L. cv. Creamgold), grown in a phytotron from seed, had a dry weight as percentage of fresh weight that decreased as growth temperatures increased from 22/16 to 33/28�C day/night. There were no significant differences between growth temperatures in the fructose, sucrose or fructan content and, although glucose content was higher at high temperatures, there was no correlation of total carbohydrate content with growth temperature. The sum of fructose, glucose and sucrose per unit tissue water was constant between temperatures, suggesting that the mono- and disaccharide content may control the bulb water content. These results, from controlled-environment tests, predict that in the field the best yield of dry weight as a percentage of fresh weight will be obtained at low growth temperatures.

RESPONSE OF ONION (Allium cepa) TO OXYFLUORFEN DURING EARLY SEEDLING DEVELOPMENT

1985 ◽  
Vol 65 (2) ◽  
pp. 357-362 ◽  
Author(s):  
W. C. AKEY ◽  
V. SOUZA MACHADO
Keyword(s):  
Allium Cepa ◽  
Dry Weight ◽  
Epicuticular Wax ◽  
Seedling Development ◽  
Allium Cepa L ◽  
Growth Room ◽  
Early Seedling ◽  
Growing Conditions ◽  
Relationship Of ◽  
Early Seedling Development

The response of onion (Allium cepa L.) to postemergence applications of oxyfluorfen during early seedling development was measured in growth room experiments. Tolerance to oxyfluorfen increased more than 70-fold from the late loop to the two fully developed leaf stage. Field and growth room experiments were also conducted to determine the relationship of spray retention and epicuticular wax on the tolerance of onion seedlings to the herbicide. In general, there was a progressive decrease in spray retention and a corresponding increase in epicuticular wax per unit dry weight as plant age increased. Spray retention in the field was approximately twice as great as in the growth room. The amount of epicuticular wax on the leaf surfaces of the onions was about equivalent under the two growing conditions. A significant decrease in epicuticular wax per unit dry weight between the late one-leaf and late two-leaf stages occurred under both field and growth room conditions, while tolerance to the herbicide continued to increase during the same period.Key words: Onions, oxyfluorfen, ED50, spray retention, epicuticular wax

scholarly journals EFFECT OF GROWTH REGULATORS AND PRESERVATIVE SOLUTION ON VASE LIFE AND WATER RELATION OF Gladiolus hybrida L. AFTER CUT FLOWERS

2019 ◽  
Vol 50 (Special) ◽  
Author(s):  
Al-Hasnawi & et al.
Keyword(s):  
Salicylic Acid ◽  
Water Balance ◽  
Dry Weight ◽  
Water Relation ◽  
Carbohydrate Content ◽  
Vase Life ◽  
Cut Flowers ◽  
Fresh Weight ◽  
Total Carotenoids ◽  
Preservative Solutions

This experiment was conducted to study the effect of five concentrations of growth regulator of (0, 25 GA3, 50 GA3, 100 Salicylic acid, 150 Salicylic acid) mg.L-1 and three types of preservative solutions on the vase life and water relations for Gladiolus hybrida L. after cut flower. The experiment was conducted as a factorial experiment (3×5) according to Randomized Complete Blocks Design, with three replicates. The results showed that GA3 (50 mg.L-1) significantly excelled in relative fresh weight of 155.33%, absorbed water 59.00 g /flower /day, the lost water 32.99 g /flower /day, water balance 26.01 g /flower /day, vase life 16.96 days, dry weight of flowers 22.89 g, and carbohydrate content in petals 22.34 %, and total carotenoids content in petals 7.84 mg/100 g dry weight. The second solution (5% sucrose + 200 mg.L-1 8.HQS + 200 mg.L-1citric acid) is significantly excelled in most studied traits. The interaction treatment that consisted of (50 mg.L-1 + second solution) is significantly excelled in traits of the relative fresh weight 168.47%, absorbed water 66.32 g/flower /day, the lost water 23.39 g/flower /day, water balance 42.93 g/flower /day, vase life 21.25 days, dry weight of flower 26.11 g, carbohydrate content in petals 20.78% and total carotenoids content in petals 10.06 mg/100g dry weight.

scholarly journals Evaluation of Physico-Chemical Composition in Bulbs of Red, Yellow, and White Onion (Allium Cepa L.) Genotypes of Sub-Tropical India

2020 ◽  
Vol 49 (4) ◽  
pp. 483-490
Author(s):  
I. Kaur ◽  
N. Chawla ◽  
A.S. Dhatt ◽  
M. Kaur
Keyword(s):  
Allium Cepa ◽  
Dry Matter ◽  
Quality Parameters ◽  
Tropical Region ◽  
Fresh Weight ◽  
Correlation Studies ◽  
Physico Chemical ◽  
Allium Cepa L ◽  
Chemical Attributes ◽  
Better Than

In this study, thirty onion (Allium cepa L.) genotypes grown in sub-tropical region of India were analysed for different physico-chemical attributes. There were significant differences among genotypes, and the onion genotypes showed a tendency to be classified according to different colours. The cultivars of the same colour exhibited similar tendencies in terms of accumulating most of the analysed components. About 1.78 fold variation in dry matter (%) and 2 fold variation in fresh weight per bulb were recorded among coloured onions. Red genotype D-888-B possessed maximum contents of TS and NRS, while the yellow coloured genotype POH-5 accumulated highest RS and lowest NRS contents. Maximum values of fructans (3.68 g/100 g DW), AIS (6 g/100 g DW), protein (10.61 g/100 g DW), and FAA (4.24 g/100 g DW) were also found in red coloured genotypes D-715-B, D-97-B, PR-305, and D-PS-121-B, respectively. Proline content in different genotypes was found to vary about 6.9 fold. The correlation studies showed a positive relationship between most of the quality parameters. Our results suggested that red group genotypes were better than yellow and white groups for all the studied parameters except for RS, which makes red genotypes more suitable for processing purposes.

scholarly journals Onion seedling production in styrofoam trays under controlled environment, as summer-planted onions

2003 ◽  
Vol 60 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Maria Cristina Veiga De Vincenzo ◽  
João Tessarioli Neto
Keyword(s):  
Plant Height ◽  
Dry Weight ◽  
Controlled Environment ◽  
Seedling Production ◽  
N Application ◽  
Initial Stage ◽  
Allium Cepa L ◽  
Set Up ◽  
Leaf Dry Weight ◽  
Plot Design

Summer-planted onion (Allium cepa L.) can increase grower profits, but the production of seedlings for transplant is difficult. This experiment was carried out in Piracicaba, SP, Brazil, with the objective of studying the behavior of the short-day onion hybrid Mercedes, in its initial stage, under controlled greenhouse environment, as summer-planted onions. Four formulated substrates, two different numbers of plants per cell were tested, and 288-cell styrofoam trays used. Trials were set up in split-plot design (n=3). Substrate and number of plants per cell represented main plots, and N application (2 and 3 times a week) the subplots. The number of three plants per cell decrease the earlier onset of bulbing and increase plant height; substrates did not show differences; and the N application 3 times a week increased plant height and leaf dry weight, but did not result in earlier onset of bulbing.

scholarly journals Biomass Production and Pigment Accumulation in Kale Grown Under Different Radiation Cycles in a Controlled Environment

HortScience ◽  
2006 ◽  
Vol 41 (6) ◽  
pp. 1412-1415 ◽  
Author(s):  
Mark G. Lefsrud ◽  
Dean A. Kopsell
Keyword(s):  
Plant Growth ◽  
Dry Weight ◽  
Weight Percent ◽  
Controlled Environment ◽  
Vegetable Crops ◽  
Fresh Weight ◽  
Earth Day ◽  
Pigment Accumulation ◽  
Β Carotene ◽  
Exact Amount

Controlled plant growing systems have consistently used the standard earth day as the radiation cycle for plant growth. However, the radiation cycle can be controlled using automated systems to regulate the exact amount of time plants are exposed to irradiation (and darkness). This experiment investigated the influence of different radiation cycle periods on plant growth and carotenoid accumulation in kale (Brassica oleracea L. var. acephala DC.). Plants were grown in a controlled environment using nutrient solutions under radiation cycle treatments of 2, 12, 24 and 48 hours, with 50% irradiance and 50% darkness during each cycle. The radiation cycles significantly affected kale fresh weight, dry weight, percent dry matter, and the accumulation of lutein, β-carotene, and chlorophyll a and b. Maximum fresh weight occurred under the 2-hour radiation cycle treatment, whereas maximum dry weight occurred under the 12-hour treatment. Maximum accumulation of lutein, β-carotene, and chlorophyll a occurred with the 12-hour radiation cycle at values of 14.5 mg/100 g, 13.1 mg/100 g, and 263.3 mg/100 g fresh weight respectively. Maximum fresh weight production of the kale was not linked to increases in chlorophyll, lutein, or β-carotene. Consumption of fruit and vegetable crops rich in lutein and β-carotene carotenoids is associated with reduced risk of cancers and aging eye diseases. Increased carotenoid concentrations in vegetable crops would therefore be expected to increase the value of these crops.

Effect of Planting Media and Varieties on Growth and Yield Production of Shallots (Allium cepa L.)

Nabatia ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Al Machfudz WDP ◽  
Deni Hari Prasetyo
Keyword(s):  
Allium Cepa ◽  
Block Design ◽  
Dry Weight ◽  
The Philippines ◽  
Variable Number ◽  
Chicken Manure ◽  
Growth And Yield ◽  
Allium Cepa L ◽  
Wet Weight ◽  
Goat Manure

This study aims to determine the effect of planting media and varieties on the growth and yield of shallot (Allium cepa L.) It was conducted from January to March 2020. The study used a randomized block design with 2 factors. Factor 1 is the type of planting media, namely without manure, chicken manure 10 tons/ha, goat manure 10 tons/ha, cow manure 10 tons/ha. Factor 2 is the shallot varieties Keta Monca and the Philippines. The results showed that there was an interaction between planting media and onion varieties on plant length variables in the combination of goat manure media with Filipino varieties at the age of 21 days with the highest yield (23,700 cm), while at 28 days it occurred in the combination of chicken manure media with keta varieties. monca with the highest yield (29,889 cm). In the variable number of leaves there was an interaction between chicken manure media and keta monca varieties at the age of 21 days (23.778 strands) and at the age of 28 days (28,000 pieces). plant, tuber wet weight per plant, tuber wet weight per plot, tuber dry weight per plant and tuber dry weight per plot. The best results occurred in the treatment of chicken manure growing media, while the lowest results occurred in the treatment without manure

Seasonal changes in the freezing tolerance of the intertidal pulmonate gastropod Melampus bidentatus Say

1985 ◽  
Vol 63 (9) ◽  
pp. 2021-2025 ◽  
Author(s):  
Stephen H. Loomis
Keyword(s):  
Freezing Tolerance ◽  
Dry Weight ◽  
Fresh Weight ◽  
Supercooling Point ◽  
Tissue Water ◽  
Lethal Temperatures ◽  
The Mean ◽  
Pulmonate Gastropod ◽  
Water Contents ◽  
Melampus Bidentatus

The mean lethal temperature of Melampus bidentatus Say ranged from −5 °C in July to −13 °C in December. The percentage of tissue water frozen measured at the mean lethal temperatures was 3% for snails collected in the summer and 74.9% for snails collected in the winter. The supercooling point of the whole snails ranged from −9 °C in September to −6.4 °C in February. The presence of an ice nucleator is indicated by an increase in the supercooling point of the haemolymph from −11.5 °C in the fall to −7.5 °C in the winter. Water content in the snails varied from 2.6 mg water/mg dry weight to 3.6 mg water/mg dry weight; however, there was no correlation between low water contents and an increase in freezing tolerance. Whole animal glycerol contents ranged from 1.14 to 2.96 μmol/g fresh weight and proline contents ranged from 1.20 to 2.19 μmol/g fresh weight. Sorbitol and trehalose were not detected.

The effects of fertilizers and drought on the concentrations of potassium in the dry matter and tissue water of field-grown spring barley

1983 ◽  
Vol 101 (3) ◽  
pp. 741-748 ◽  
Author(s):  
R. A. Leigh ◽  
A. E. Johnston
Keyword(s):  
Dry Matter ◽  
Spring Barley ◽  
Weight Ratio ◽  
Growth Period ◽  
Dry Weight ◽  
Reliable Indicator ◽  
Charge Balance ◽  
Fresh Weight ◽  
Tissue Water ◽  
High K

SUMMARYThe effects of N, P, K and Na silicate fertilizers, and drought on the concentrations of K in the dry matter and tissue water of field-grown spring barley crops have been investigated. Percentage K in dry matter depended on the amounts of N, P, K or water received by the crops and was linearly related to fresh weight to dry weight ratio, but the slope of this relationship depended on whether or not the crops received K. Expressing K concentrations on the basis of tissue water eliminated differences between crops, except for those given insufficient K. Barley crops given fertilizer K maintained K concentrations in their tissue water of about 200 mmol/kg tissue water for most of the growth period but crops grown without K had only 50–70 mmol/kg tissue water. The results indicate that K concentrations in the tissue water are a more reliable indicator of tissue K status than % K in dry matter.Decreases in crop K content resulting from poor K supply were balanced by increases in Na and Ca (but not Mg) contents so that total cation concentrations in the tissue water were similar in low and high K crops. The extra Na and Ca are probably primarily involved in maintaining charge balance for anion absorption but once in the plant they may also substitute for K in its osmotic role.

scholarly journals Effects of sodium hypochlorite on some physiological and cytogenetical parameters in Allium cepa L. exposed to salt stress

2019 ◽  
Vol 48 (2) ◽  
pp. 223-229 ◽  
Author(s):  
Kürşat Çavuşoğlu ◽  
Fadime Doğu ◽  
Dilek Çavuşoğlu
Keyword(s):  
Salt Stress ◽  
Seed Germination ◽  
Mitotic Activity ◽  
Allium Cepa ◽  
Sodium Hypochlorite ◽  
Seedling Growth ◽  
Chromosomal Aberrations ◽  
Root Tip ◽  
Fresh Weight ◽  
Allium Cepa L

The effects of sodium hypochlorite (NaClO) on the seed germination, seedling growth (radicle length, radicle number and fresh weight), mitotic activity and chromosomal aberrations of Allium cepa L. germinated under salt stress were studied. Salt stress considerably inhibited the seed germination and seedling growth of A. cepa. Furthermore, it markedly reduced the mitotic index in root tip meristems of the seeds and increased the number of chromosomal aberrations. Whereas, the detrimental effects of salt on the seed germination, seedling growth, mitotic activitiy and chromosomal aberrations were dramatically alleviated in varying degrees by NaClO application.

scholarly journals Are Copper Nanoparticles Toxic to All Plants? A Case Study on Onion (Allium cepa L.)

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1006
Author(s):  
Shady Abdel Mottaleb ◽  
Ahmed Z. A. Hassan ◽  
Reham El-Bahbohy ◽  
Abdel Wahab M. Mahmoud
Keyword(s):  
Allium Cepa ◽  
Field Experiments ◽  
Growth Parameters ◽  
Chemical Constituents ◽  
Sandy Soils ◽  
Dry Weight ◽  
Soluble Solids ◽  
Cu Deficiency ◽  
Cuo Nps ◽  
Allium Cepa L

Sandy soils with high alkalinity are characterized by low copper (Cu) contents that lead to many deficiency symptoms in plants. Cu deficiency in plants can be corrected using several cheap Cu sources. Nevertheless, the effects that novel sources, such as Cu nanoparticles (NPs), have on plants remain poorly studied. In the present work, we investigated the effect and efficiency of Cu supplementation to onion (Allium cepa L.) plants using Cu sulfate, chelate, or NPs, and compared their effects on bulb quality, yield, and contents of phytochemicals. Two successive seasons (2018/2019 and 2019/2020) of field experiments were conducted in newly reclaimed sandy soils, where plants were sprayed with either 10 ppm CuO NPs, 20 ppm CuSO4·5H2O, or 20 ppm of Cu chelates. Overall, Cu deficiency (control) resulted in a significant decrease in yield and all quality traits of onion plants. CuO NPs treatment significantly enhanced growth parameters, including plant height, number of leaves, fresh and dry weight, yield, and bulb quality, compared with Cu sulfate and chelates. This was also the case regarding chemical constituents such as macro- and micro-nutrients, total soluble solids, phytochemical compounds, vitamins, and amino acids. Although Cu sulfate is the cheapest form used for Cu supplementation, results of the present study suggest that CuO NPs was not only safe to use, but also was the treatment that led to the highest onion yield and quality.

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