scholarly journals Effects of range, seasons and storage under different temperatures on germination of Senecio vulgaris (Asteraceae) seeds

2016 ◽  
Author(s):  
Noel Ndihokubwayo ◽  
Viet - Thang Nguyen ◽  
Dandan Cheng
Keyword(s):  
High Temperature ◽  
Biodiversity Loss ◽  
Economic Loss ◽  
Storage Conditions ◽  
Germination Percentage ◽  
Ambient Conditions ◽  
Climate Chamber ◽  
Senecio Vulgaris ◽  
The North ◽  
And Storage

Invasive plants colonize new environments, become pests and cause biodiversity loss, economic loss and health damage. Senecio vulgaris (Common groundsel, Asteraceae), a cosmopolitan weed wildly distributes in the temperate area, is reported with large populations in the north–eastern and south–western parts, but not in southern, central, northern or north-western part of China. We studied the germination behavior of S. vulgaris to explain the distribution and the biological invasion of this species in China. We used seeds originated from 12 populations in native and invasive range (six populations in each range) to conduct germination experiments in a climate chamber and ambient condition. When incubated in climate chamber (15°C) seeds from the majority of population showed >90% germination percentage (GP) and the GP was equal for both ranges. The mean germination time (MGT) was significant different among the populations. Under ambient conditions, significant effect of range, storage conditions (stored at 4 or 27°C) and seasons (in summer or autumn) were observed on the GP while the MGT was only affected by the season. In autumn, the GP was higher (38.6%) and the MGT was slightly longer than that in summer (4.5%). In autumn, seeds stored at 4°C showed higher GP than those stored at 27°C, and seeds from invasive population revealed higher GP than those from native populations. High GP and short time for seed emergence demonstrated that in S. vulgaris seeds checked in this study were from Senecio vulgaris ssp vulgaris, the non – dormancy subspecies. The results also implied that the high temperature exceeds the threshold for S. vulgaris to germinate and storage at high temperature cause S. vulgaris seeds lost the viability greatly. This demonstrates the reason why in Wuhan S.vulgaris can’t establish natural and viable populations, and also explain why S.vulgaris is scattered in China.

scholarly journals Effects of range, seasons and storage under different temperatures on germination of Senecio vulgaris (Asteraceae) seeds

2016 ◽  
Author(s):  
Noel Ndihokubwayo ◽  
Viet - Thang Nguyen ◽  
Dandan Cheng
Keyword(s):  
High Temperature ◽  
Biodiversity Loss ◽  
Economic Loss ◽  
Storage Conditions ◽  
Germination Percentage ◽  
Ambient Conditions ◽  
Climate Chamber ◽  
Senecio Vulgaris ◽  
The North ◽  
And Storage

Invasive plants colonize new environments, become pests and cause biodiversity loss, economic loss and health damage. Senecio vulgaris (Common groundsel, Asteraceae), a cosmopolitan weed wildly distributes in the temperate area, is reported with large populations in the north–eastern and south–western parts, but not in southern, central, northern or north-western part of China. We studied the germination behavior of S. vulgaris to explain the distribution and the biological invasion of this species in China. We used seeds originated from 12 populations in native and invasive range (six populations in each range) to conduct germination experiments in a climate chamber and ambient condition. When incubated in climate chamber (15°C) seeds from the majority of population showed >90% germination percentage (GP) and the GP was equal for both ranges. The mean germination time (MGT) was significant different among the populations. Under ambient conditions, significant effect of range, storage conditions (stored at 4 or 27°C) and seasons (in summer or autumn) were observed on the GP while the MGT was only affected by the season. In autumn, the GP was higher (38.6%) and the MGT was slightly longer than that in summer (4.5%). In autumn, seeds stored at 4°C showed higher GP than those stored at 27°C, and seeds from invasive population revealed higher GP than those from native populations. High GP and short time for seed emergence demonstrated that in S. vulgaris seeds checked in this study were from Senecio vulgaris ssp vulgaris, the non – dormancy subspecies. The results also implied that the high temperature exceeds the threshold for S. vulgaris to germinate and storage at high temperature cause S. vulgaris seeds lost the viability greatly. This demonstrates the reason why in Wuhan S.vulgaris can’t establish natural and viable populations, and also explain why S.vulgaris is scattered in China.

scholarly journals Effects of origin, seasons and storage under different temperatures on germination ofSenecio vulgaris(Asteraceae) seeds

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2346 ◽  
Author(s):  
Noel Ndihokubwayo ◽  
Viet-Thang Nguyen ◽  
Dandan Cheng
Keyword(s):  
Room Temperature ◽  
Negative Impact ◽  
Biodiversity Loss ◽  
Economic Loss ◽  
Storage Conditions ◽  
Germination Percentage ◽  
Central China ◽  
Climate Chamber ◽  
The North ◽  
Ambient Room Temperature

Invasive plants colonize new environments, become pests and cause biodiversity loss, economic loss and health damage.Senecio vulgarisL. (Common groundsel, Asteraceae), a widely distributing cosmopolitan weed in the temperate area, is reported with large populations in the north–eastern and south–western part, but not in southern, central, or north-western parts of China. We studied the germination behavior ofS. vulgaristo explain the distribution and the biological invasion of this species in China. We used seeds originating from six native and six invasive populations to conduct germination experiments in a climate chamber and under outdoor condition. When incubated in a climate chamber (15 °C), seeds from the majority of the populations showed >90% germination percentage (GP) and the GP was equal for seeds with a native and invasive origin. The mean germination time (MGT) was significantly different among the populations. Under outdoor conditions, significant effects of origin, storage conditions (stored at 4 °C or ambient room temperature, ca. 27 °C) and seasons (in summer or autumn) were observed on the GP while the MGT was only affected by the season. In autumn, the GP (38.6%) was higher and the MGT was slightly longer than that in summer. In autumn, seeds stored at 4 °C showed higher GP than those stored at ambient room temperature (ca.27 °C), and seeds from invasive populations revealed higher GP than those from native populations. The results implied that the high temperature in summer has a negative impact on the germination and might cause viability loss or secondary dormancy toS. vulgarisseeds. Our study offers a clue to exploring what factor limits the distribution ofS. vulgarisin China by explaining why, in the cities in South-East China and central China such as Wuhan,S. vulgariscannot establish natural and viable populations.

The Effect of Various UHT Processing Parameters and Storage Conditions on the Saturated Aldehydes In Half-and-Half Cream

1991 ◽  
Vol 54 (2) ◽  
pp. 109-112 ◽  
Author(s):  
R.K. HUTCHENS ◽  
A.P. HANSEN
Keyword(s):  
Gas Chromatography ◽  
High Temperature ◽  
Column Chromatography ◽  
Steam Injection ◽  
Processing Parameters ◽  
Storage Conditions ◽  
Tetra Pak ◽  
And Storage ◽  
Ultra High Temperature

Raw cream was standardized to 10% fat and processed by ultra-high-temperature (UHT) steam injection at 149°C for 20 s, 149°C for 3.4 s, 138°C for 20 s, and 143°C for 7 s, then aseptically packaged by a Tetra Pak AB3-250 filler. Packages were stored for 12 months at 24°C and analyzed at 0, 1, 3, 6, and 12 months. Fat-soluble carbonyls were extracted from the UHT cream with carbonyl-free hexanes and converted to their 2,4-dinitrophenyl-hydrazone derivatives. Alkanal hydrazones were separated by column chromatography into pure fractions. Spectrophotometry and gas chromatography were used to identify the alkanals. Butanal, hexanal, heptanal, nonanal, and decanal were identified and found to decrease in concentration during storage.

scholarly journals Effect of Packaging and Storage on Quality Characteristics of Dried Wild Pomegranate Arils (Anardana) Prepared in Solar Tunnel Drier

2020 ◽  
pp. 8-23
Author(s):  
Abhimanyu Thakur ◽  
N. S. Thakur ◽  
Hamid . ◽  
Pradeep Kumar ◽  
Kanchan Bhatt
Keyword(s):  
Value Added ◽  
Storage Period ◽  
Titratable Acidity ◽  
Punica Granatum ◽  
Storage Condition ◽  
Storage Conditions ◽  
Quality Characteristics ◽  
Ambient Conditions ◽  
Hydroxymethyl Furfural ◽  
And Storage

Wild pomegranate (Punica granatum L.) fruits were procured from Karsog area of Mandi district of Himachal Pradesh, India (1265 m above mean sea level). The arils extracted from the fruits were dehydrated in a solar tunnel (30-45°C) drier to prepare value added product Anardana. The developed product was packed in three different packaging materials viz. gunny bags, aluminium laminated pouches (ALP) and aluminium laminated pouches with vacuum (ALPV) and stored under ambient and refrigerated temperature for a period of 12 months so as to evaluate overall effect of storage period, storage condition and packaging material. After 12 months of storage period, higher retention of various quality characteristics like TSS, titratable acidity, ascorbic acid, total sugars, anthocyanins content, sensory characteristic scores with less increase in moisture content, NEB (non-enzymatic browning),HMF (hydroxymethyl furfural) and furfural content was observed in Anardana packed in ALPV followed by ALP and gunny bags. The changes in the quality characteristics of the Anardana were slower in refrigerated storage conditions as compared to ambient conditions.

scholarly journals Flower stages, germination and viability of pollen grains of Annona squamosa L. in tropical conditions

2021 ◽  
Vol 43 ◽  
pp. e51013
Author(s):  
Digelma Camila Barros Araújo ◽  
Pollyana Cardoso Chagas ◽  
Edvan Alves Chagas ◽  
Elias Ariel Moura ◽  
Railin Rodrigues de Oliveira ◽  
...  
Keyword(s):  
Pollen Grains ◽  
Floral Biology ◽  
Storage Conditions ◽  
Germination Percentage ◽  
Climatic Conditions ◽  
Pollen Grain ◽  
Ambient Conditions ◽  
Climate Conditions ◽  
Tropical Conditions ◽  
Germinated Pollen

The success in the application of artificial pollination techniques, aspects of floral biology should receive special attention, especially regarding the viability studies of pollen grains. In this sense, two experiments were carried out, aiming to determine the floral stages: floral opening (anthesis), female, male and senescence stages of A. squamosa L flowers under tropical climate conditions, and to evaluate the germination and viability of pollen grains submitted to different storage conditions. In the first experiment, observations and data collection began when flowers were still closed. Readings were taken every two hours for 46 hours until all the flowers reached the senescence stage. For the second, the experimental design was completely randomized, in a 2 x 7 factorial scheme, with 2 storage conditions (environment at 27 ± 2°C and refrigerated at 5 ± 2°C) and 7 pollen grain conditioning times (0, 4, 8, 12, 16, 20 and 24 hours), with 4 repetitions for the analysis of pollen grain germination and 3 repetitions for the analysis of pollen grain viability, and each repetition consisted of one blade. The variables evaluated were percentage of viable and non-viable pollen grains and percentage of germinated and non-germinated pollen grains. For tropical climatic conditions, the flower anthesis (female stage) of the sugar-apple begins at 00:00 h, extending until 12:00h on the same day. The flowers of the tree reach a functionally staminate stage (male stage) from 6 a.m. the next day. Pollen grains stored at room conditions (27 ± 2°C) remain viable for up to 24 hours after collection, showing that storage in a cold environment at low temperatures (5 ± 2°C) is not necessary. Seed pollen grains have a germination percentage of 51.25% when stored under ambient conditions (27 ± 2°C) for up to 4 hours after collection.

scholarly journals Seed germination and seedling vigour of italian ryegrass, cocksfoot and timothy following harvest and storage

2011 ◽  
Vol 35 (6) ◽  
pp. 1141-1148 ◽  
Author(s):  
Rade Stanisavljevic ◽  
Dragoslav Ðjokic ◽  
Jasmina Milenkovic ◽  
Lana Ðukanovic ◽  
Vladeta Stevovic ◽  
...  
Keyword(s):  
Seed Germination ◽  
Lolium Multiflorum ◽  
Germination Percentage ◽  
Italian Ryegrass ◽  
Ambient Conditions ◽  
Dormancy Breaking ◽  
Storage Duration ◽  
Seedling Vigour ◽  
Sowing Time ◽  
And Storage

During post-harvest maturation, different species vary in the length of dormancy breaking or germination increases. Seed dormancy and slow seedling development often limit establishment of forage grass stands. Seed germination and seedling vigour of Italian ryegrass (Lolium italicum A. Braun, Synonym Lolium multiflorum L.), cocksfoot (Dactylis glomerata L.) and timothy (Phleum pretense L.) were observed after harvest and storage. After harvest in June, seeds were stored under standard storage conditions and sampled every 30 days after harvest (DAH), up to 270 DAH, and then every 60 days up to 990 DAH. At each date, seeds were tested for final germination percentage and for seedling vigour traits. Timothy seeds had a maximum germination (88%) and the best seedlings vigour at 90 DAH, which implies that early autumn (September-October) is the best sowing period for freshly harvested seeds of timothy. Timothy seed germination was poor from 270 DAH (73%). The best germination and vigour of Italian ryegrass and cocksfoot seedlings were between 270 and 330 DAH, which equates to spring sowing time (March-April) in the succeeding year. Cocksfoot and Italian ryegrass seeds maintained satisfactory germination levels up to 630 DAH (81%) and 810 DAH (81%), respectively. The data can serve for the determination of a proper storage duration management between harvest and sowing of the tested species under ambient conditions of south-eastern Europe.

scholarly journals Effect of Temperature, Light, and Storage Time on the Seed Germination of Pinus bungeana Zucc. ex Endl.: The Role of Seed-Covering Layers and Abscisic Acid Changes

Forests ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 300 ◽  
Author(s):  
Congcong Guo ◽  
Yongbao Shen ◽  
Fenghou Shi
Keyword(s):  
Abscisic Acid ◽  
High Temperature ◽  
Seed Germination ◽  
High Temperatures ◽  
Germination Percentage ◽  
Effect Of Temperature ◽  
Inhibition Mechanism ◽  
Radicle Protrusion ◽  
Pinus Bungeana ◽  
And Storage

Pinus bungeana Zucc. ex Endl. is an endemic conifer tree species in China with high ornamental value. In order to investigate favorable conditions for seed germination and explore the germination inhibition mechanism of this species at high temperatures, the effects of temperature, light, and storage on the mean germination time (MGT), speed of germination (SG), and total germination percentage (TGP) are evaluated here. Seeds that have either been kept still or entered into a state of dormancy at high temperature are assessed here by a recovery experiment. Furthermore, the contribution of covering layers on thermo-inhibition is analyzed here, including the way they work. This has been realized by the structural observation and via the determination of the abscisic acid (ABA) content. The results show that seeds germinate to a high percentage (approximately 90%) at temperatures of 15 or 20 °C, with or without light, whereas higher temperatures of 25 or 30 °C impeded radicle protrusion and resulted in the germination percentage decreasing sharply (within 5%). Inhibition at high temperatures was thoroughly reversed (bringing about approximately 80% germination) by placing the ungerminated seeds in favorable temperatures and incubating them for an additional 30 days. Dry cold storage did little to reduce the temperature request for germination. Embryo coverings, especially the nucellar membrane, and ABA levels both had a dominant role in seed germination regulation in response to temperature. Under favorable temperature conditions, the levels of ABA significantly decreased. Germination occurred when the levels dropped to a threshold of 15 ng/g (FW (Fresh Weight)). Incubation at a high temperature (25 °C) greatly increased ABA levels and caused the inhibition of radicle protrusion.

Seed Germination and storage behavior of Pittosporum eriocarpum Banks. ex Gaertn.: An endemic species of North-West Himalaya

2019 ◽  
Vol 42 (3) ◽  
pp. 239-242
Author(s):  
Bhavana Joshi ◽  
◽  
Giriraj Singh Panwar ◽  
Kumar Ambrish ◽  
◽  
...  
Keyword(s):  
Seed Germination ◽  
Gibberellic Acid ◽  
Seed Viability ◽  
Germination Percentage ◽  
North West ◽  
The North ◽  
West Himalaya ◽  
Physiological Dormancy ◽  
Storage Behavior ◽  
And Storage

Pittosporum eriocarpum Banks. ex Gaertn. (Pittosporaceae) is an endemic and threatened species of the North-West Himalaya and locally known as Agni. In this study the seed viability, seed germination and storage behavior of seeds was studied stored at different temperature. Maximum viability was reported in fresh seeds (98.21%) while the maximum germination percentage (87.11%) was observed in 6-months old seeds stored in refrigerator (polythene). Application of Gibberellic acid has improved the seed germination (54.13%) and to overcome the morpho-physiological dormancy of the seed to an extent.

scholarly journals Influence of Different Concentrations of 1-Methylcyclopropene (1-MCP) and Storage Conditions on the Physico-chemical Properties and Shelf-life of Tomatoes (Solanum lycopersicum L.)

2019 ◽  
pp. 1-11
Author(s):  
M. E. Amoateng ◽  
P. Kumah ◽  
I. Yaala ◽  
B. Amoasah
Keyword(s):  
Shelf Life ◽  
Chemical Properties ◽  
Titratable Acidity ◽  
Storage Conditions ◽  
Ambient Conditions ◽  
Tomato Cultivar ◽  
Solanum Lycopersicum L ◽  
Randomized Design ◽  
Gas Loss ◽  
And Storage

‘Power’ tomato cultivar was harvested at the mature green stage and studied to determine how different 1-Methylcyclopropene (1-MCP) concentrations and storage conditions may influence its quality and shelf-life. A 3 x 2 factorial arrangement in Completely Randomized Design (CRD) was used and it was replicated three times. The factors were the tomato cultivar: ‘Power’, three 1-MCP concentration levels: 1 ppm, 2 ppm, untreated was 0 ppm and two storage conditions: Ambient and refrigerator conditions. The research was conducted between January and May 2017 at the Department of Horticulture, KNUST in Kumasi, Ghana. The 1-MCP concentration required were obtained by adding 100 ml of heated distilled water at 50°C to appropriate amounts of 1-MCP (MaxFresh, 3.3%) powder to obtain the 1 ppm and 2 ppm concentrations. After the 1-MCP powder has completely dissolved, it was then placed in a sealed bottle with a mini fan attached and then placed in the treatment chamber and released in a form of vapour on fruits and sealed immediately to avoid gas loss for a period of 24 hours. They were then stored in the refrigerator and ambient conditions at a temperature of 13°C-15°C and 29.5°C with Relative Humidity of 60-75% and 80-85% respectively. There was a significantly (P<0.01) delayed in ripening as characterized by changes in pH, firmness and total titratable acidity. Tomatoes treated with 1 ppm and 2 ppm of 1-MCP concentrations had delayed ripening when stored in the refrigerator and as a result had a longer shelf-life of 74 and 90 days respectively compared to fruits that were not treated and kept at ambient condition which took 60 days. There is confirmation from these results that the use of 1-MCP have saleable outlook for those who grow and trade in a way of delaying the ripening of green tomatoes.

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