ABSTRACT
Microorganisms associated with decayed pawpaw fruits were isolated and identified. Following sample preparation and serial dilutions, diluents of each sample were plated out in duplicates on nutrient agar and sabouroud dextrose agar using pour plate and spread plate methods. A total of seven fungal species, Aspergillus spp, Mucor spp, Penicillium spp, Fusarium spp, Yeast, Monilia spp, and Rhizopus spp were identified. Lactobacillus spp, Escherichia coli, Bacillus spp, Staphylococcus spp, Pseudomonas spp, and Proetus spp were the identified bacterial isolates. In fungi Aspergillus spp had the highest percentage occurrences (100%) while Monilia spp had the least percentage occurrences (28.57%). In bacterial Pseudomonas spp had the highest percentage occurrences of (71.43%) while Lactobacillus spp had the least percentage occurrence of (28.57%). Results of pathogenicity test showed that four fungal species were able to cause decay in healthy pawpaw fruit, including Aspergillus spp, Penicillium spp, Fusarium spp, Monilia spp. These isolates that cause rot were considered causative agent for spoilage of pawpaw fruits.
TABLE OF CONTENTS
Title Page i
Certification ii Dedication iii Acknowledgement iv
Table of Contents v
List of Tables viii
Figure ix
Abstract x
CHAPTER ONE
INTRODUCTION 1
1.1.1 Statement of Problem 5
1.1.2 Research Objective 5
CHAPTER TWO
LITERATURE REVIEW 6
2.1 Classification 7
2.2 Origin and Distribution7
2.3 Botanical Description 10
2.4Types of Papaya 13
2.5 Growth habit and Soil16
2.6 Pollination 17
2.7 Propagation 18
2.8 Harvesting 18
2.9 Nutritional value 19
2.10 Economic Importance 20
2.11 Industrial Importance 20
2.12 Chemical Compounds 21
2.13 Toxicity and Allergy 22
2.14 Health Benefits 23
2.15 Insect Pests and Nematodes 28
2.16 Diseases of Papaya 31
CHAPTER THREE
3.0 Materials and Methods 37
3.1 Sample Collection 37
3.2.1 Media Preparation 37
3.2.2 Sample Preparation 37
3.2.3 Isolation of microbial isolate from decayed pawpaw fruits 38
3.3.1 Direct placement technique 38
3.3.2 Characterisation and identification 38
3.3.3 Characterisation of fungal isolates 39
3.4.1 Characterisation of bacteria isolates 39
3.4.2 Biochemical test 39
3.4.3 Gram staining 39
3.4.4 Catalase test 40
3.4.5 Citrate test 40
3.4.6 Coagulase test 40
3.4.7 Indole test41
3.4.8 Voges Proskeur test 41
3.5.1 Sugar fermentation test 41
3.5.2 Oxidase test 42
3.5.3 Methyl-red test 42
3.6 Pathogenicity test 42
CHAPTER FOUR
4.0 Results 44
CHAPTER FIVE
5.0 Discussion 48
5.1 Conclusion 50
5.2 Recommendation 50
REFERNCES 51
APPENDIX 59
GRACE, M (2020). ISOLATION, IDENTIFICATION AND CHARACTERISATION OF MICROORGANISM IN DECAYING PAWPAW FRUIT. Mouau.afribary.org: Retrieved Nov 13, 2024, from https://repository.mouau.edu.ng/work/view/isolation-identification-and-characterisation-of-microorganism-in-decaying-pawpaw-fruit
MOUAU/11/19121, GRACE. "ISOLATION, IDENTIFICATION AND CHARACTERISATION OF MICROORGANISM IN DECAYING PAWPAW FRUIT" Mouau.afribary.org. Mouau.afribary.org, 29 Apr. 2020, https://repository.mouau.edu.ng/work/view/isolation-identification-and-characterisation-of-microorganism-in-decaying-pawpaw-fruit. Accessed 13 Nov. 2024.
MOUAU/11/19121, GRACE. "ISOLATION, IDENTIFICATION AND CHARACTERISATION OF MICROORGANISM IN DECAYING PAWPAW FRUIT". Mouau.afribary.org, Mouau.afribary.org, 29 Apr. 2020. Web. 13 Nov. 2024. < https://repository.mouau.edu.ng/work/view/isolation-identification-and-characterisation-of-microorganism-in-decaying-pawpaw-fruit >.
MOUAU/11/19121, GRACE. "ISOLATION, IDENTIFICATION AND CHARACTERISATION OF MICROORGANISM IN DECAYING PAWPAW FRUIT" Mouau.afribary.org (2020). Accessed 13 Nov. 2024. https://repository.mouau.edu.ng/work/view/isolation-identification-and-characterisation-of-microorganism-in-decaying-pawpaw-fruit