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

Beer, Josef Johannes Jacobus De; Petersen, Neal

doi:10.1525/abt.2017.79.7.578

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…Weights of the vases containing vase solutions without the cut spikes were recorded daily during the vase life evaluation period. The average daily VSU rate was calculated by the formula: NSA rate (g g −1 initial fresh weight (IFW) = (St −1 − S t )/IFW of the stem (4) where St is the weight of the pot solution (g) at t = evaluation day and St −1 is the weight of the pot solution (g) on the previous day.…”

Section: Vase Solution Uptake Rate (Vsu)mentioning

confidence: 99%

“…Due to its rose-like flower shapes and a wide range of beautiful colors, it has become more famous in recent years so that it is now among the top 10 cut flowers in the world, and the market of this flower has increased to more than 50% over the past 10 years [ 1 , 2 , 3 ]. Flowers are fast living organs of the plants with a high metabolic activity making them very susceptible to postharvest losses [ 4 ]. For this reason, the vase life is a commercial attribute determining the flexibility of the market at any time and an important indicator for cut flowers value.…”

Section: Introductionmentioning

confidence: 99%

“…Ethylene has been demonstrated to be the most important key signal playing role in plant cell and tissue senescence processes via activating the gene expression and enzyme activity of different degrading enzymes including lipoxygenases, lipases, pectinases, proteinases, polygalacturonases, and chlorophyllases [ 7 , 8 , 9 ]. The role of ethylene in enhancing the respiration rate resulting in an oxidative burst due to excess free radical and ROS production has been well demonstrated [ 4 , 10 ]. Furthermore, the enhanced respiration rate is the cause for carbohydrate depletion in harvested crops leading to accelerated senescence and breakdown [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…This is of most importance in cut flowers, which are the active growing parts of the plants and have no further reserves for consumption during elevated respiration rates. Therefore, ethylene production and action is the most important factor affecting the postharvest life and quality of harvested perishable crops including the cut flowers [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

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24-Epibrasinolide Modulates the Vase Life of Lisianthus Cut Flowers by Modulating ACC Oxidase Enzyme Activity and Physiological Responses

Darvish

Shirzad

Asghari

et al. 2021

Plants

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Ethylene is the most important factor playing roles in senescence and deterioration of harvested crops including cut flowers. Brassinosteroids (BRs), as natural phytohormones, have been reported to differently modulate ethylene production and related senescence processes in different crops. This study was carried out to determine the effects of different levels of 24-epibrassinolide (EBL) on ACC oxidase enzyme activity, the final enzyme in ethylene biosynthesis pathway, vase life, and senescence rate in lisianthus cut flowers. Harvested flowers were treated with EBL (at 0, 3, 6, and 9 µmol/L) and kept at 25 °C for 15 days. The ACC oxidase activity, water absorption, malondialdehyde (MDA) production and vase solution absorption rates, chlorophyll and anthocyanin contents, and the vase life of the flowers were evaluated during and at the end of storage. EBL at 3 µmol/L significantly (p ≤ 0.01) enhanced the flower vase life by decreasing the ACC oxidase activity, MDA production and senescence rates, and enhancing chlorophyll and anthocyanin biosynthesis and accumulation, relative water content, and vase solution absorption rates. By increasing the concentration, EBL negatively affected the flower vase life and postharvest quality probably via enhancing the ACC oxidase enzyme activity and subsequent ethylene production. EBL at 6 and 9 µmol/L and in a concentration dependent manner, enhanced the ACC oxidase activity and MDA production rate and decreased chlorophyll and anthocyanin accumulation and water absorption rate. The results indicate that the effects of brassinosteroids on ethylene production and physiology of lisianthus cut flowers is highly dose dependent.

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Section: Vase Solution Uptake Rate (Vsu)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

24-Epibrasinolide Modulates the Vase Life of Lisianthus Cut Flowers by Modulating ACC Oxidase Enzyme Activity and Physiological Responses

Darvish

Shirzad

Asghari

et al. 2021

Plants

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show abstract

“…This can be linked to, firstly, Dutch IK and also local IK according to which coke, sugar, bleach, etc. can be used to prolong the shelf life of flowers (De Beer & Petersen 2017b). Both these problems can be investigated in the laboratory, facilitating the border-crossing between the NOS and the NOIK.…”

Section: Findings With Regard To the Nature Of Indigenous Knowledge And The Nature Of Sciencementioning

confidence: 99%

Arguing for the inclusion of indigenous knowledge in the STEM curriculum: Possibilities and challenges

Beer¹,

Wyk²

2019

NWU Self-Directed Learning Series

Self Cite

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Peer review declarationThe publisher (AOSIS) endorses the South African 'National Scholarly Book Publishers Forum Best Practice for Peer Review of Scholarly Books'. The manuscript was subjected to a rigorous two-step peer review prior to publication, with the identities of the reviewers not revealed to the author(s). The reviewers were independent of the publisher and/or authors in question. The reviewers commented positively on the scholarly merits of the manuscript and recommended that the manuscript should be published. Where the reviewers recommended revision and/or improvements to the manuscript, the authors responded adequately to such recommendations. Research JustificationThis book is the result of a longitudinal research project (2016)(2017)(2018) funded by the National Research Foundation and the Fuchs Foundation, and it disseminates original research. The project researched the affordances of indigenous knowledge in the school Science, Technology and Mathematics curricula. Short learning programmes (SLPs) were offered to Science, Technology, Engineering and Mathematics (STEM) teachers, during which they engaged in creative and inquiry-based teaching and learning strategies. Research shows that strategies such as problem-based and cooperative learning have the potential to enhance self-directed learning. This design-based research was conducted in several provinces in South Africa (North-West Province, the Northern Cape, Limpopo province, and Gauteng). Based on the data obtained after each intervention, design principles were formulated for redesigning of SLPs. The qualitative research focussed on teachers' lived experiences of the epistemological bordercrossing between Natural Science and indigenous knowledge, their views on the nature of science and indigenous knowledge, and the reformed teaching and learning that took place after the intervention in teachers' classrooms. Most of the chapters in the book report empirical data, with the exception of three chapters (Ch. 2, Ch. 10 and Ch. 11), that can be categorised as systematic reviews. The book is devoted to scholarship in the field of STEM education and teacher professional development, with a specific focus on research into the enhancement of self-directed learning. The target audience are scholars working in the fields of indigenous knowledge systems, STEM education, teacher professional development and self-directed learning. This book makes a unique contribution in terms of, firstly, its extensive use of third-generation Cultural-Historical Activity Theory (CHAT) as a research lens and, secondly, in drawing on research from the fields of neuroscience, science education philosophy, self-directed learning and indigenous knowledge systems, in arguing for such border-crossing. Chapter 1 shows how this research contributes to the development of fourthgeneration CHAT, which, owing to the complexity of the object (which Engeström refers to as 'runaway objects'), requires a focus on numerous activity systems. The book also explores the conundrum of rese...

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Issues in introducing collaborative learning in South East Asia: A critical discussion

Saito

Takahashi²,

Wintachai

et al. 2020

Management in Education

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In many South East Asian countries, group learning has been introduced as a method to reform classroom practices. Cooperative learning in particular, based on role division, rewards and competition, is highly popular. On the other hand, collaborative learning, the other type of group learning, based on mutual consultation and help-seeking without the structures of cooperative learning, is a challenge to introduce. The aim of this essay is to discuss the reasons why teachers in South East Asia face difficulty in adjusting to collaborative learning. Three issues are discussed, namely (1) students’ reluctance to ask what they do not know due to the lesson structure and negative psychological effects; (2) difficulty in creating sufficiently challenging tasks for students to have mutual consultation, due to the teachers’ insufficient experience in academic inquiry and expertise in their disciplines; and (3) connecting their learning from observation and reflection with their own teaching.

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

Cited by 9 publications

References 7 publications

24-Epibrasinolide Modulates the Vase Life of Lisianthus Cut Flowers by Modulating ACC Oxidase Enzyme Activity and Physiological Responses

24-Epibrasinolide Modulates the Vase Life of Lisianthus Cut Flowers by Modulating ACC Oxidase Enzyme Activity and Physiological Responses

Arguing for the inclusion of indigenous knowledge in the STEM curriculum: Possibilities and challenges

Issues in introducing collaborative learning in South East Asia: A critical discussion

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