Post-Harvest Physiology of Cut Flowers: A Problem-Based, Cooperative Learning Activity for the Biology Classroom

2017 ◽  
Vol 79 (7) ◽  
pp. 578-583 ◽  
Author(s):  
Josef de Beer ◽  
Neal Petersen
Keyword(s):  
Cooperative Learning ◽  
Knowledge Production ◽  
Flower Senescence ◽  
Learning Activity ◽  
Cut Flower ◽  
Cut Flowers ◽  
Cooperative Teaching ◽  
Mode 2 ◽  
Teaching Learning

This article describes a problem-based, cooperative learning activity, where students investigate the role of ethylene in flower senescence. The cooperative learning activity is contextualized in an authentic problem experienced in the cut flower industry: how can the shelf life of cut flowers be prolonged? We describe the procedure for conducting the experiment and show the affectiveness of contextualized science that includes indigenous knowledge—an approach that Gibbons calls “mode 2 knowledge production.” In addition we also give suggestions on how this type of problem-based, cooperative teaching-learning activity can be used in a school biology classroom.

scholarly journals Effect of PGRs on Antioxidant Activity and Phytochemical in Delay Senescence of Lily Cut Flowers

Agronomy ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1704
Author(s):  
Sabir Aziz ◽  
Adnan Younis ◽  
Muhammad Jafar Jaskani ◽  
Rashid Ahmad
Keyword(s):  
Vase Life ◽  
Cut Flower ◽  
Cut Flowers ◽  
Fresh Weight ◽  
Chlorophyll Contents ◽  
Spad Value ◽  
Maximum Change ◽  
Preservative Solutions

The short vase life is the major problem in the cut flower industry. This study was conducted to evaluate the role of different vase solutions and oils in enhancing the quality and vase life of lily cut flowers. Salicylic acid (SA; 300 mg L−1), citric acid (CA; 300 mg L−1), gibberellic acid (GA; 100 mg L−1), and clove oil (200 mg L−1) were used as vase solutions. These treatments were applied after pulsing with preoptimized sucrose 5%. It was found that SA (300 mg L−1) + sucrose (5%) improved the performance of cut flowers, which further increased the longevity of all tested lily cultivars up to eight days and the longest vase life by 17.6 days. The maximum change in fresh weight (5.60 g), increase in chlorophyll contents (3.2 SPAD value), highest protein content (6.1 mg g−1 FW), and increase in the activities of superoxide dismutase (SOD) (51.0 U g−1 protein), catalase (CAT) (36.3 U g−1 protein), and peroxidase (POD) (41.6 U g−1 protein), were recorded with the CA (300 mg L−1) + sucrose 5%. Among the cultivars, “Zambesi” performed best compared to “Sorbonne” and “Caesars”. The maximum anthocyanin contents (198%) were recorded in “Caesars”. In conclusion, among the different preservative solutions, SA performed best to prolong the vase life and quality of lily cut flowers.

scholarly journals The Effect of a Sugar-Containing Preservative on Senescence-Related Processes in Cut Clematis Flowers

2018 ◽  
Vol 47 (2) ◽  
pp. 432-440 ◽  
Author(s):  
Julita RABIZA-ŚWIDER ◽  
Ewa SKUTNIK ◽  
Agata JĘDRZEJUK
Keyword(s):  
Proteolytic Activity ◽  
Cysteine Protease ◽  
Reducing Sugars ◽  
Soluble Proteins ◽  
Flower Senescence ◽  
Vase Life ◽  
Free Proline ◽  
Cut Flower ◽  
Cut Flowers ◽  
Life Itself

Clematis is a new species grown as cut flower, whose vase life is variable and cultivar-depended. Little is known about senescence of its cut flowers and their response to flower preservatives. The aim of the study was to evaluate the effect of a preservative (standard preservative SP, 8-hydroxyquinoline citrate plus sucrose) or a biocide solution (8-HQC) on certain senescence-related processes in cut clematis flowers. Analyses were done immediately after harvest and at the end of the vase life when control flowers held in water were wilting. A possible relationship between senescence parameters and the vase life of clematis taxa was also sought. As in most cut flowers, the contents of reducing sugars and soluble proteins in clematis petals decreased during the vase life while the proteolytic activity, including that of the cysteine protease, increased and was accompanied by accumulation of free proline and ammonium. Cut flower longevity in cultivars under study was not associated with the initial levels of reducing sugars, soluble proteins or free proline. Neither was the initial proteolytic activity or its increase during vase life related to the vase life itself: cultivars having comparable life spans differed dramatically in the initial and final proteolytic activities. Both solutions containing 8-HQC significantly affected the senescence-related processes and flowers held in them had more soluble proteins and lower proteolytic activity (total, and that of the cysteine protease) than control flowers held in water. Approximately a twofold increase in reducing sugars was observed in flowers held in SP relative to those held in water or in 8-HQC while the accumulation of free proline and ammonium was limited in their petals. This suggests a regulating action of exogenous sugar in senescence of clematis flowers. However, the delay of senescence produced by the preservative was not always associated with a longer vase life in any given cultivar. Further studies are needed to elucidate the role of sugar in clematis flower senescence.

Learning Critical Qualitative Research

2018 ◽  
Vol 11 (4) ◽  
pp. 365-374 ◽  
Author(s):  
Ping-Chun Hsiung
Keyword(s):  
Qualitative Research ◽  
Graduate Students ◽  
Knowledge Production ◽  
Teaching And Learning ◽  
Pedagogical Practices ◽  
Special Issue ◽  
Emotional Aspect ◽  
Critical Qualitative Research ◽  
Teaching Learning

This Special Issue focuses on the learning of qualitative research as a legitimate and productive site of inquiry with the potential to illuminate and advance pedagogical practices. Its three objectives were (1) empowering and giving voice to new generations of qualitative research practitioners, (2) facilitating dialogue across the divide between the teaching and learning of critical qualitative research, and (3) mapping out a space of knowledge production and accumulation in critical qualitative research. The Issue includes five articles written by junior scholars or graduate students with or under the supervision of their mentors/supervisors. From different angle and to varying degrees, they touch on the role of teacher in the teaching/learning, the emotional aspect of learning, and the institutional context within which the learning takes place.

scholarly journals Polyamines accentuate vase life by augmenting antioxidant system in cut spikes of Consolida ajacis (L.) Schur.

2021 ◽  
Vol 27 (4) ◽  
pp. 495-504
Author(s):  
Aehsan ul Haq ◽  
Sumira Farooq ◽  
Mohammad Lateef Lone ◽  
Shazia Parveen ◽  
Foziya Altaf ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Postharvest Quality ◽  
Flower Senescence ◽  
Vase Life ◽  
Distilled Water ◽  
Oxygen Species ◽  
Cut Flowers ◽  
Postharvest Senescence

Abstract Postharvest senescence is one of the crucial challenges limiting the marketability of cut flowers. Pertinently, recent investigations implicate extensive role of polyamines in regulation of flower senescence. The present study was envisaged to test the efficacy of poylamines in preserving the postharvest quality of Consolida ajacis (C. ajacis) cut spikes. The cut spikes of C. ajacis were subjected to various treatments of polyamines viz, 4 mM Spermine (SPM), 6mM Putrescine (PUT) and 6 mM Spermidine (SPD). A separate set of spikes held in distilled water represented the control. Our results authenticate a significant improvement in vase life of cut spikes of C. ajacis as compared to control. The increment in vase life was commensurate with the higher concentration of sugars, proteins and phenols in the tepal tissues. Polyamines amplified the activity of various antioxidant enzymes viz, superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) to overcome the deleterious effects of reactive oxygen species (ROS). The membrane outflow of tepal tissues was profoundly reduced due to attenuated lipoxygenase (LOX) activity. These findings reveal conspicuous role of polyamines particularly SPM in modulation of flower senescence in cut spikes of C. ajacis.

scholarly journals Abstraction and embodiment: exploring the process of grasping a general

2022 ◽  
Author(s):  
Svanhild Breive
Keyword(s):  
Point Of View ◽  
Learning Activity ◽  
Reflection Symmetry ◽  
Research Journal ◽  
Gradual Process ◽  
Mathematical Abstraction ◽  
Dialectical Perspective ◽  
Semiotic Perspective ◽  
Teaching Learning

AbstractThis paper reports from a case study which explores kindergarten children’s mathematical abstraction in a teaching–learning activity about reflection symmetry. From a dialectical perspective, abstraction is here conceived as a process, as a genuine part of human activity, where the learner establishes “a point of view from which the concrete can be seen as meaningfully related” (van Oers & Poland Mathematics Education Research Journal, 19(2), 10–22, 2007, p. 13–14). A cultural-historical semiotic perspective to embodiment is used to explore the characteristics of kindergarten children’s mathematical abstraction. In the selected segment, two 5-year-old boys explore the concept of reflection symmetry using a doll pram. In the activity, the two boys first point to concrete features of the sensory manifold, then one of the boys’ awareness gradually moves to the imagined and finally to grasping a general and establishing a new point of view. The findings illustrate the essential role of gestures, bodily actions, and rhythm, in conjunction with spoken words, in the two boys’ gradual process of grasping a general. The study advances our knowledge about the nature of mathematical abstraction and challenges the traditional view on abstraction as a sort of decontextualised higher order thinking. This study argues that abstraction is not a matter of going from the concrete to the abstract, rather it is an emergent and context-bound process, as a genuine part of children’s concrete embodied activities.

scholarly journals The Role of Soluble Sugars in Vase Solutions during the Vase Life of Eustoma grandiflorum

HortScience ◽  
2013 ◽  
Vol 48 (2) ◽  
pp. 222-226
Author(s):  
Ya-Ching Chuang ◽  
Yao-Chien Alex Chang
Keyword(s):  
Sucrose Solution ◽  
Sucrose Concentration ◽  
Soluble Sugars ◽  
Flower Senescence ◽  
Vase Life ◽  
Cut Flowers ◽  
Eustoma Grandiflorum ◽  
Flower Opening ◽  
Stems And Leaves

The vase life of Eustoma cut flowers can be extended by adding sugars to the vase solution, but the exact role of sugars and how they are translocated in tissues are not clear. Thus, we observed the preserving effect of different sugars in vase solutions on Eustoma and compared sugar concentrations in vase solutions and in the flowers as well as stems and leaves of cut flowers in a solution containing 200 mg·L−1 8-hydroxyquinoline sulfate (8-HQS) with and without 20 g·L−1 sucrose during different flowering stages. Inclusion of glucose, fructose, or sucrose in the vase solution extended the vase life of cut flowers with no significant differences among sugar types. During flower opening, the concentration of added sucrose in the vase solution dropped, and the fresh weight (FW), glucose concentration, and sucrose concentration of flowers in sucrose solutions increased, whereas flowers in solutions without sucrose had lower FW and glucose concentrations. During flower senescence, sugar concentration in the vase solution did not change much, but the FW and sucrose concentrations in all flowers declined, although the FW of sucrose-treated flowers fell more slowly. For stems and leaves in the sucrose solution, sugar concentrations increased during the first 7 days with only glucose slightly declining during senescence, whereas the FW was maintained during the entire vase life. In contrast, FWs of those in the solution without sucrose gradually declined. In conclusion, sucrose in the vase solution promoted flower opening and maintained the water balance of Eustoma cut flowers. Glucose and fructose also extended the vase life, likely in similar ways.

scholarly journals Effects of Different Preservatives on Cut Flower of Luculia pinceana: A Novel Fragrant Ornamental Species

HortScience ◽  
2021 ◽  
pp. 1-8
Author(s):  
Lingfang Kong ◽  
Fan Li ◽  
Ronghui Du ◽  
Huaiting Geng ◽  
Shifeng Li ◽  
...  
Keyword(s):  
Water Balance ◽  
Flower Senescence ◽  
Distribution Area ◽  
Vase Life ◽  
Cut Flower ◽  
Cut Flowers ◽  
Water Control ◽  
Flower Bud ◽  
Mda Content ◽  
Bud Opening

Luculia pinceana is a potential cut flower because of its long-term blooming inflorescences and charming fragrance. However, its narrow distribution area and unexplored wild status severely restrict its applications, thus leading to the scientific research of cut L. pinceana flowers. To our knowledge, there is no available published information about the postharvest fresh-keeping of L. pinceana. During this study, the cut flowers of L. pinceana were tested using nine preservatives with different concentrations of sucrose and 8-hydroxyquinoline (8-HQ) to evaluate the fresh-keeping effects. Through the investigation and analysis of vase life, bud opening and abortion rate, water balance, malonaldehyde (MDA) content, and peroxidase (POD) activity, we selected and identified the best vase solution for cut L. pinceana flowers. The results suggested that the preservative of 1% sucrose and 100 mg/L 8-HQ could significantly prolong the vase life of cut L. pinceana flower up to 9 days compared with water control. This solution positively affects flower bud blooming, delays flower senescence, improves the water balance, inhibits the MDA accumulation, and increases POD activity. Therefore, this preservative is suitable for the fresh-keeping of cut L. pinceana flowers. Our study is the first to report the effects of preservatives on cut L. pinceana flower. The results showed that the low-sugar-containing (1% sugar) preservatives can effectively improve the ornamental quality of fresh flowers and demonstrated that the postharvest fresh-keeping of L. pinceana requires low sugar and is insensitive to microorganisms.

scholarly journals Overview of the Dynamic Role of Specialty Cut Flowers in the International Cut Flower Market

Horticulturae ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 51
Author(s):  
Anastasios Darras
Keyword(s):  
High Energy ◽  
Production Costs ◽  
Cut Flower ◽  
Cut Flowers ◽  
The Past ◽  
Low Co2 ◽  
Energy Inputs ◽  
The Us ◽  
Product Sales

The global cut flower industry has faced serious challenges over the years, but still remains an important sector of agriculture. Floriculture businesses seek new, innovative trends and niches to help increase product sales. Specialty cut flower (SCF) production has increased in the past 20 years in the US, Australia, Africa, and Europe. SCF production and sales could increase further if these new products were supported by dynamic marketing campaigns that focus on their strengths compared to the traditional cut flowers (TCF) such as roses, carnations, gerberas, and chrysanthemums. The major strength of SCF is the eco-friendly profile, which is associated to low CO2 footprints and environmental outputs. This contrasts TCF cultivation, which is associated to high energy inputs, especially at the traditional production centres (e.g., The Netherlands). It is suggested that environmental legislations, production costs, and customer demand for eco-friendly products will positively affect future SCF cultivation and sale.

scholarly journals STUDI TENTANG SUPERVISI AKADEMIK DALAM UPAYA PENINGKATAN KOMPETENSI GURU PENDIDIKAN AGAMA ISLAM PADA SEKOLAH MENEGAH PERTAMA DI KABUPATEN TANGERANG

2017 ◽  
Vol 6 (1) ◽  
pp. 18
Author(s):  
Girmono Girmono ◽  
Nusa Putra ◽  
Nanang Fattah
Keyword(s):  
Communication Technology ◽  
Descriptive Analysis ◽  
National Standards ◽  
Learning Activity ◽  
Information Communication ◽  
Know How ◽  
Qualitative Approaches ◽  
Teaching Learning ◽  
Guide Lines

<p class="Affiliation">The purposes of this study are: First, to know how the role of supervisors in supervising learning administrations and academic supervision to Islamic education teachers at school. Second, to know supervisors’ performance based on standard. Third, to know the handicaps in doing supervisors’ duties. Fourth, to know supervisors’ strategy in solving the problems. The Method used in this research is descriptive analysis with qualitative approaches. Based on the research goals above, it can be conluded: First, based on document analysis and teachers’ administration observation that teachers have had complete documents as guide lines in doing teaching learning process. However, most of teachers still adopted lesson planning they made from other schools. Second, that the supervisors of Islamic Relegious Education in doing their tasks is not maximum yet, such as monitoring eight national standards of education and assessing teachers’ performance. There are even other tasks, such as the activity of guiding and evaluating professional teachers which were not carried out. Third, the handicaps faced by supervisors were (1) the teachers who were absent in teachers’ forum, (2) the difficulties of changing teachers’ mindset in arranging program, and (3) the weakness of mastering Information Communication Technology. Fourth, the solutions offered are (1) the supervision goal is supposed to be communicated and comprehended by teachers, principals, and supervisors, (2) the supervision should be well-planned, constructive, and democratic, (3) the teachers should be involved in the process of planning and implementing supervision so that they understand procedures and advantages of supervision in developing their professionalism, (4) the supervision program should motivate to the changes in the teaching learning activity.</p><p class="Affiliation"><strong><em>Kata kunci</em></strong><em>: supervisi, akademik, PAI, profesionalisme.</em></p>

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