The present study was conducted for regeneration of Rosa centifolia and reduction of oxidative browning. Shoot tips with axillary buds were used as explant. The explants were surface sterilized with 70% alcohol for 4 minutes and 5% bleach for 4 minutes followed by three washing with autoclaved double distilled water After that the explants were cultured on MS media (Murashige and skoog,1962) supplemented with different concentration of BAP (Benzyladenine) and NAA (Naphthalene acetic acid). Effect of different concentrations of BAP (1.5 mg/l, 3 mg/l) alone and in combination with NAA (0.5 mg/l) for shoot induction. BAP and NAA (3.0 mg/l +1.5 mg/l respectively) gives the good results for shooting. the effect of NAA (1.5 mg/l, 3 mg/l) alone and in combination with BAP (0.5 mg/l) for root induction was examined. NAA and BAP (3.0 mg/l +1.5 mg/l respectively) gives the good results for rooting. After rooting plants were acclimatized and successfully transferred to the greenhouse. To control the oxidative browning in Rosa centifolia different treatments (charcoal, charcoal + running water, stirring in antioxidant solution of citric acid and ascorbic acid) were used. But the charcoal with the running water gives the good results.
Table of Contents
1. INTRODUCTION
2. REVIEW OF LITERATURE
2.1 Other ornamental plants
2.2 Fruit plants
3. MATERIALS AND METHODS
3.1 Explant collection
3.2 Preparation of medium
3.3 Sterilization of explant and culture
3.4 Browning
3.5 Media used
3.5.1 Media for browning
3.5.2 Media for shooting
3.5.3 Media for rooting
3.6 Cultural conditions
3.7 Data collection
3.7.1 Shoot multiplication
3.7.1.1 Number of days to sprout
3.7.1.2 Number of laterals
3.7.1.3 Shoots length (cm)
3.7.1.4 Number of leaves/plant
3.7.2 Root initiation
3.7.2.1 Number of days to emerge roots
3.7.2.2 Number of roots
3.7.2.3 Root length (cm)
3.7.3 Browning
4. RESULTS AND DISCUSSION
4.1 Number of days to initiate shoots
4.2 Number of laterals
4.3 Number of leaves/explant
4.5 Shoot length
4.6 Number of days to emerge roots
4.7 Number of roots
4.8 Root length
4.9 Acclimatization
4.10 Browning control
5. SUMMARY
5.1 Conclusion
Objectives and Research Themes
The primary objective of this research is to establish an effective micropropagation protocol for Rosa centifolia to enable mass production of disease-free plants, while addressing the critical issue of oxidative browning that inhibits in vitro development.
- Standardization of plant tissue culture media for Rosa centifolia.
- Optimization of growth regulator concentrations (Auxins and Cytokinins) for shoot induction and root initiation.
- Evaluation of strategies to mitigate oxidative browning in explants.
- Assessment of various physical and chemical treatments during the in vitro process.
- Determination of optimal environmental and cultural conditions for plantlet regeneration.
Excerpt from the Book
4.10 Browning control
Browning is one of the important factors which limit the growth of roses in vitro. Browning is due to the polyphenol substances which exude from the cut surface of the explants.
The graph shows that minimum (57%) browning was in the treatment which contain MS medium along with charcoal and the explants were treated with running water. Maximum (75%) browning was in the simple MS medium. These results are similar with Pittet and Moncousin, (1981) stated that charcoal in the MS medium reduces browning and enhance the shoot growth. After few days of browning whole the explant and media which is in touch with the explant became brown. These results are supported by Bhat & Chandel (1991) stated that Lethal browning occurs in some plant tissue cultures, especially woody plants, and is generally considered to result from the oxidation of phenolic compounds released from the cut ends of the explants. These also correlated with the results of Skirivin and Chu, (1979). They stated that browning in the medium can be controlled by adding charcoal in the MS medium.
Summary of Chapters
1. INTRODUCTION: Outlines the significance of Rosa centifolia, the limitations of traditional propagation methods, and the potential of tissue culture techniques.
2. REVIEW OF LITERATURE: Provides a comprehensive overview of previous research regarding in vitro propagation of roses and other ornamental or fruit plants.
3. MATERIALS AND METHODS: Details the experimental procedures, including medium preparation, explant sterilization, and data collection parameters.
4. RESULTS AND DISCUSSION: Presents statistical data and analysis regarding the effects of various growth regulators on shoot and root development, as well as browning mitigation.
5. SUMMARY: Summarizes the study findings and provides a definitive conclusion on the most effective techniques for the micropropagation of Rosa centifolia.
Keywords
Rosa centifolia, Micropropagation, Plant tissue culture, MS medium, BAP, NAA, Oxidative browning, Activated charcoal, Shoot induction, Root initiation, In vitro, Growth regulators, Explant, Clonal propagation, Ornamental plants
Frequently Asked Questions
What is the core focus of this research study?
The study focuses on developing an efficient micropropagation protocol for Rosa centifolia to overcome challenges such as slow multiplication and oxidative browning during tissue culture.
What are the primary themes of this work?
The primary themes include plant regeneration, the optimization of culture media using specific concentrations of hormones, and effective management of explant browning.
What is the ultimate objective of this thesis?
The goal is to determine the optimal combinations of auxins and cytokinins and to implement effective treatments to ensure the mass production of healthy, disease-free Rosa centifolia plants.
Which scientific methodology is utilized?
The research employs an experimental in vitro culture approach, using nodal segments as explants on Murashige and Skoog (MS) medium, followed by statistical analysis of growth parameters.
What is covered in the main body of the work?
The main body covers a comprehensive review of existing literature, detailed experimental procedures, and a discussion of the results related to shoot induction, root emergence, and browning control.
How is this work categorized by its keywords?
The work is categorized by its focus on rose tissue culture, growth regulators (BAP, NAA), browning inhibition strategies, and specific micropropagation techniques for ornamental plants.
What role does activated charcoal play in the experiment?
Activated charcoal is used as a critical additive in the culture medium to absorb toxic phenolic compounds and oxidates that are released from the cut surfaces of the explants.
Which combination of growth regulators yielded the best results for shoot length?
The research identified that a combination of BAP and NAA concentrations resulted in the maximum shoot length and improved overall shoot development.
- Arbeit zitieren
- Gulzar Akhtar (Autor:in), 2009, Micropropagation of Rosa centifolia, München, GRIN Verlag, https://www.grin.com/document/286650
