scholarly journals Collection Guidelines to Achieve a Viable Caper Commercial Propagation

Agronomy ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 74
Author(s):  
María Laura Foschi ◽  
Mariano Juan ◽  
Bernardo Pascual ◽  
Nuria Pascual-Seva
Keyword(s):  
Mediterranean Region ◽  
Seed Viability ◽  
General Rule ◽  
Seed Storage ◽  
Maturation Stage ◽  
Rule Of Thumb ◽  
Perennial Plant ◽  
The Third ◽  
Plant Characteristic ◽  
Capparis Spinosa

The caper (Capparis spinosa L.) is a perennial plant characteristic of the Mediterranean region that presents difficulties in its propagation, both vegetatively and by seeds. The main aim of this study is to provide collection guidelines to achieve a viable caper commercial propagation, for which three experiments were undertaken to determine the viability and germination in different seed lots. In the first experiment, commercial and own produced seeds (collected with the same criteria as commercial seeds) were analysed; the commercial seeds presented the lowest viability and germination. The second experiment analysed the effect of the fruit (from which the seeds were extracted) at its maturation stage, obtaining the lowest seed viability and germination in the seeds extracted from the dry fruits. In the third experiment, seed viability and germination were analysed immediately after collection, following a short drying period (3 d), and after six storage months. Viability and germination decreased with seed storage. Overall, it can be stated that caper seeds are sensitive to desiccation; consequently, a general rule of thumb is to collect the fruits once a week, to extract the seeds, and to plant them immediately for germination.

scholarly journals Biological features of seeds of a wild-growing species of Poterium polygamum

2022 ◽  
Vol 354 (11-12) ◽  
pp. 97-99
Author(s):  
M. A. Starostina ◽  
N. G. Lapenko
Keyword(s):  
Natural Population ◽  
Seed Viability ◽  
Storage Period ◽  
Seed Storage ◽  
Scientific Basis ◽  
The Third ◽  
Biological Features ◽  
High Germination ◽  
Grass Stand ◽  
The Subject

Relevance. Biological features (morphometric indicators, viability and germinating power) of Poterium polygamum seeds found in natural communites of the Stavropol Territory have been studied. The conservation of wild-growing plant species in the natural population and the rational use of their potential are relevant.Methods. Years of study — 2013–2021. The subject of the study is Poterium polygamum seeds. Seeds were collected in 2013. Studies were carried out according to the methods of studying seed material. Freshly harvested seeds and seeds of different shelf life were germinated in petri dishes at a temperature of 18–20 °C.Results. The collected seeds of Poterium polygamum are quite large. The length of the seeds is 4–5 mm, the width is about 2.5 mm. The mass of 1000 pieces of seeds on average was 10.59 grams. Complete absence of viability of freshly harvested Poterium polygamum seeds was revealed. After three months, seed viability was 97%. This is a shallow physiological rest associated with the post-harvest maturation period. During the storage of seeds, their high germination was established — from 70 to 100%. The duration of seed storage is 8 years. The largest number of germinated seeds and their germinating power were noted in the third year of their storage (100%). Seeds germinated on the third or fourth day. The differences between the viability of seeds and their germinating power are not great. In the eighth year of storage of Poterium polygamum seeds, viability and germinating power were slightly reduced. The storage period of seeds, in which they retain the ability to germinate and the germinating power, is long. It has been found that the wild species Poterium polygamum belongs to plants with a high (70 to 100%) viability. This species is regularly resumed in the natural population. The revealed biological features of Poterium polygamum seeds can become the scientific basis during the reconstruction of degraded natural grass stand and in selection work.

scholarly journals Desiccation Tolerance as the Basis of Long-Term Seed Viability

2020 ◽  
Vol 22 (1) ◽  
pp. 101
Author(s):  
Galina Smolikova ◽  
Tatiana Leonova ◽  
Natalia Vashurina ◽  
Andrej Frolov ◽  
Sergei Medvedev
Keyword(s):  
Desiccation Tolerance ◽  
Vascular Plants ◽  
Molecular Mechanisms ◽  
Regulation Of Gene Expression ◽  
Seed Viability ◽  
Late Embryogenesis Abundant ◽  
Maturation Stage ◽  
Terrestrial Plants ◽  
Complex Anatomy ◽  
Orthodox Seeds

Desiccation tolerance appeared as the key adaptation feature of photoautotrophic organisms for survival in terrestrial habitats. During the further evolution, vascular plants developed complex anatomy structures and molecular mechanisms to maintain the hydrated state of cell environment and sustain dehydration. However, the role of the genes encoding the mechanisms behind this adaptive feature of terrestrial plants changed with their evolution. Thus, in higher vascular plants it is restricted to protection of spores, seeds and pollen from dehydration, whereas the mature vegetative stages became sensitive to desiccation. During maturation, orthodox seeds lose up to 95% of water and successfully enter dormancy. This feature allows seeds maintaining their viability even under strongly fluctuating environmental conditions. The mechanisms behind the desiccation tolerance are activated at the late seed maturation stage and are associated with the accumulation of late embryogenesis abundant (LEA) proteins, small heat shock proteins (sHSP), non-reducing oligosaccharides, and antioxidants of different chemical nature. The main regulators of maturation and desiccation tolerance are abscisic acid and protein DOG1, which control the network of transcription factors, represented by LEC1, LEC2, FUS3, ABI3, ABI5, AGL67, PLATZ1, PLATZ2. This network is complemented by epigenetic regulation of gene expression via methylation of DNA, post-translational modifications of histones and chromatin remodeling. These fine regulatory mechanisms allow orthodox seeds maintaining desiccation tolerance during the whole period of germination up to the stage of radicle protrusion. This time point, in which seeds lose desiccation tolerance, is critical for the whole process of seed development.

scholarly journals Cynipid gall growth dynamics and enemy attack: effects of gall size, toughness and thickness

1999 ◽  
Vol 28 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Geraldo W. Fernandes ◽  
Mário M. Espírito-Santo ◽  
Maurício L. Faria
Keyword(s):  
Multiple Regression ◽  
Wall Thickness ◽  
Natural Enemies ◽  
Growth Dynamics ◽  
Maturation Stage ◽  
Regression Analyses ◽  
The Third ◽  
Galling Insects

Galling insects have developed many strategies to preclude or reduce the attack by natural enemies, such as an increased wall thickness early in the season, and switching to larger and tougher walls later in the maturation stage. In this study, we observed the efficiency of each one of these parameters in reducing mortality of the leaf galling wasp Atrusca caprone Weld (Hymenoptera: Cynipidae), on Quercus turbinella Greene (Fagaceae), during the three months of gall development (June-August). Gall diameter and wall toughness increased from the first to the third month of the study (ANOVA, Diameter: F = 88.73, p < 0.0001; ANOVA, Toughness: F = 26.13, p < 0.0001). However, gall wall thickness increased from June to July, decreasing in August (ANOVA, F = 35.84, p < 0.0001). Gall survivorship was only 2 % in June, increasing to 10 % in July and to 29.3 % in August. Multiple regression analyses showed that only gall wall toughness influenced gall susceptibility to parasitoid attack (r² = 0.52, F = 13.84, p < 0.01). Gall survivorship was very low in the first month due probably to low wall toughness, which led to a higher success of oviposition by parasitoids during this phase. These results suggest that the first month is critical to gall establishment, and the galls which are not parasitized at this stage are less likely to be attacked later.

scholarly journals Mid storage seed hardening: a mechanical method to maintain seed viability during long term jute seed preservation

2021 ◽  
Vol 8 (1) ◽  
pp. 79-88
Author(s):  
Md. Nasir Uddin ◽  
S. M. Mahbub Ali ◽  
Md. Abu Sadat ◽  
Md Amazed Hossain Chowdhury ◽  
Israt Jahan Mumu ◽  
...  
Keyword(s):  
Crop Production ◽  
Agricultural Sector ◽  
Seed Viability ◽  
Early Period ◽  
Chemical Properties ◽  
Seed Storage ◽  
Germination Percentage ◽  
Oil Degradation ◽  
Hardening Treatment

Seed plays an important role in agricultural sector for both production and consumption purpose. Availability of vigour seed is one of the major constraints for maximizing crop production. However, healthy seed can also lose its viability during seed storage by changing different physio-chemical properties. Influence of environmental factors and seed containers during storage leading to seed deterioration. In this research, mid storage seed hardening treatment was applied in different aged seeds of jute species (C. Capsularis & C. olitorius) with two types of storage bags. Seed hardening treatment showed the less moisture content with better germination percentage compared to the untreated species of jute seeds. Seed packing in polythene bags during both short and long term seed storages had higher viable seeds compared to the cloth packing seeds. The effect of seed hardening treatment on seed oil content and pattern of oil degradation is distinct in early period of storage. The faster rate of oil degradation, soluble protein and free amino acids was found in seeds of un-treated stored seeds in cloth bag. Contrary, very slow rate of oil degradation was observed in harden seed and stored in polythene bag which indicated better storability of harden seeds.

Seed storage and germination studies of Garcinia talbotii Raizada ex Santapau seeds - an endemic tree from Western Ghats of India

2016 ◽  
Vol 23 (2) ◽  
pp. 73-78
Author(s):  
T. Sabu ◽  
P.S. Shameer ◽  
Chitra Rajeswary ◽  
N. Mohanan ◽  
C. Anilkumar
Keyword(s):  
Ex Situ Conservation ◽  
Storage Temperature ◽  
Seed Viability ◽  
Seed Storage ◽  
Ex Situ ◽  
Hermetic Storage ◽  
Western Ghats Of India ◽  
Relationship Of ◽  
The Relationship ◽  
And Storage

Seeds of Garcinia talbotii remained viable hardly for two weeks in open room conditions. As part of ex-situ conservation of Garcinia talbotii, seeds longevity was studied since seeds are the main propagule. For this, the relationship of seed viability with respect to different moisture content and storage temperature were analyzed. Seed storage behaviour is also investigated. Being recalcitrant, seeds are desiccation sensitive as well as chilling sensitive. During hermetic storage of seeds at 300C /70 % RH seeds retained viability about 6 months.

High seed viability recorded in an endangered endemic species, 'Isoplexis isabelliana' (Scrophulariaceae), after more than 30 years of storage in a conservation seed bank

2021 ◽  
Vol 42 ◽  
pp. e69341
Author(s):  
Miguel Ángel González Pérez ◽  
Nereida Cabrera-García ◽  
Isabel Cayon-Fernández
Keyword(s):  
Seed Bank ◽  
Germination Rate ◽  
Genetic Material ◽  
Natural Populations ◽  
Seed Viability ◽  
Seed Storage ◽  
Botanical Garden ◽  
Storage Conditions ◽  
Seed Banks ◽  
Ex Situ

Conservation seed banks are essential for ex-situ conservation of genetic biodiversity. These institutions are especially relevant for threatened species and play a vital role in their conservation by preserving genetic material. However, samples deposited in the seed banks must germinate when necessary to use them (i.e., recovery plans, etc.). This study uses four accessions of the endemic endangered species from Gran Canaria Island (Canary Islands), Isoplexis isabelliana (Webb & Berthel.) Masf. (Scrophulariaceae). Germination tests were carried out to measure seed viability through time and the possible impact of seed storage on their viability. These accessions have been kept in the seed bank for four months to thirty years under different storage conditions. Germination results differed for seeds after 45 days of exposition using 16 hours light and 8 hours darkness at 17 °C. Accessions kept in the seed bank, independently of storage, showed a high germination percentage (89%). Whereas the accessions with rough storage conditions showed a 0% germination rate. The results highlighted the good state of conservation of the material deposited in the Seed Bank of the Botanical Garden "Viera y Clavijo" and the reliability of the temperature and humidity conditions in which the seeds of I. isabelliana have been stored. We consider these results as momentous since several natural populations of I. isabelliana has been affected by the last forest fire on the island.

When to Use Cognitive Therapy Techniques to Enhance the Effects of Exposure

2019 ◽  
pp. 175-184
Author(s):  
Carolyn Black Becker ◽  
Nicholas R. Farrell ◽  
Glenn Waller
Keyword(s):  
Eating Disorder ◽  
Cognitive Therapy ◽  
Behavioral Change ◽  
Exposure Therapy ◽  
General Rule ◽  
Careful Consideration ◽  
Rule Of Thumb ◽  
Eating Disorder Symptoms

Given that one of the main objectives of exposure therapy is to alter individuals’ cognitions related to feared stimuli, cognitive therapy can be effectively used as an adjunctive strategy to exposure. However, it is important to note that behavioral change methods show greater effectiveness in reducing eating disorder symptoms as compared to cognitive therapy. There are also circumstances in which utilizing cognitive therapy as an adjunct to exposure is not warranted. Accordingly, clinicians need to use careful consideration when deciding whether to engage eating disorder patients in cognitive therapy. As a general rule of thumb, clinicians are encouraged to employ cognitive therapy techniques when a patient is demonstrating significant hesitancy to begin exposure or is deriving notably suboptimal benefit from exposure.

scholarly journals Seed storage: maintaining seed viability and vigor for restoration use

2020 ◽  
Vol 28 (S3) ◽  
Author(s):  
Marcello De Vitis ◽  
Fiona R. Hay ◽  
John B. Dickie ◽  
Clare Trivedi ◽  
Jaeyong Choi ◽  
...  
Keyword(s):  
Seed Viability ◽  
Seed Storage

Response To Bunker Fuel Oil: The Options

2001 ◽  
Vol 2001 (1) ◽  
pp. 597-603 ◽  
Author(s):  
Tim Lunel ◽  
Louise Davies
Keyword(s):  
Oil Spill ◽  
Field Trial ◽  
General Rule ◽  
Field Trials ◽  
Fuel Oil ◽  
Sea Temperature ◽  
Rule Of Thumb ◽  
Fuel Oils ◽  
Favorable Conditions ◽  
Bunker Fuel

ABSTRACT As a general “rule of thumb,” a dispersant response is not the most appropriate response to a spill of Intermediate Fuel Oil (IFO)-380 bunker fuel oil However, as with all rules of thumb, there are some exceptions. There has been increasing evidence that a limited number of oil spill dispersants can be used on certain types of oil spill where previously dispersants would not have been considered. A new dispersant tested in field trials carried out by AEA Technology in 1997 (Lunel and Lewis, 1999), indicated that there might be an opportunity to treat viscous emulsions and bunker fuel oils by dispersant spraying. Following these field trials, AEA Technology undertook a number of laboratory-based studies, including tests in France during the first week of the Erika spill, which indicate that IFO-180 and IFO-380 bunker fuel oils may be dispersible under favorable conditions when fresh and when lightly emulsified. At present, the authors conclude that the rule of thumb—a dispersant response is not likely to be the most appropriate response to most spills of IFO-380—holds. However, the authors believe that there may be some conditions when a dispersant response can be considered as part of a response to a spill of IFO-380 to reduce the volume of oil beaching. It has been recognized by most experts dealing with this issue that a field trial is needed to establish the validity of this assertion. In the absence of a field trial, the authors believe that a dispersant response to IFO-380 can be considered providing that:The reduction of volume beaching will result in a significant net environmental or economic benefit.The sea temperature is 10°–15°C or greater.The dispersant to be used is COREXIT®9500, Dasic Slickgone LTSW, Inipol 90, or Superdispersant 25.The characteristics of the IFO-380 are known and have been assessed by an oil spill expert at the time of the spill.In situ monitoring is in place to assess whether the response is effective.

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