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Title of Thesis

Biometric and Biochemical Studies on Hot Pepper

Author(s)

Qumer Iqbal

Institute/University/Department Details
Faculty of Agriculture / University of Agriculture, Faisalabad
Session
2009
Subject
Horticulture
Number of Pages
186
Keywords (Extracted from title, table of contents and abstract of thesis)
Biometric, Biochemical Studies, Hot Pepper, Capsaicinoids, plant growing environments, hot pepper hybrids

Abstract
Studies were conducted to evaluate the impact of plastic mulches viz. black, clear and bare soil in the modification of plant growing environments on three hot pepper hybrids namely Sky Red, Maha and Wonder King in poly/plastic tunnels during the year 2005-06 and 2006-07. Hot pepper hybrids and plastic mulches had significant effect on plant growth and yield attributes. By using clear plastic mulch intensive weed proliferation was problematic issue; however under black plastic mulch almost complete weed suppression was achieved which results in increased fruit yield than hot peppers grown under clear plastic mulch and bare soil (control). The pattern of antioxidant accumulation was envisaged in hot peppers harvested at different stages; immature green, mature green, color break, red ripe and dried fruit. Capsaicinoids had significant distribution in mature green stage while progressive accretion of carotenoids and ascorbic acid was observed at dried and red ripe stage of all hybrids. respectively. However, the pattern of total phenolic contents biosynthesis was found significant at immature green stage in Sky Red where as in Maha at color break, stage mid in case of Wonder King at red ripe stage. Aflatoxin contamination in hot pepper hybrids was investigated under various temperatures (20, 25 and 30°C) and packaging regimes (polyethylene and jute bags) during five months storage period. Aflatoxin detection under these conditions had lower levels than the existing regulatory limits ascribed by European Commission (EC No. 1881/2006) that is 10ug kg-I for total aflatoxins. Aflatoxin contamination and microbial load was increased significantly with the increase in temperature and storage duration which was heavily infested when samples packed in jute bags and stored at 25 and 30°C respectively. Storage duration and temperature regimes had inverse relation on antioxidant quality of hot pepper ecotypes as well. Further attempts were made to decontaminate aflatoxin contaminated samples of hot pepper hybrids (from previous study) subjected to gamma radiation (2, 4 and 6 kGy) and its effect on antioxidant stability was again assessed after three month storage. Higher the irradiation dose, lower the concentration of carotenoids and ascorbic acid ascertained in hot pepper ecotypes; however, capsaicinoids and polyphenols rendered greater stability at higher irradiation dose during storage. Irradiated samples of hot peppers had 7% reduction in aflatoxin contamination as compared to non-irradiated (control). Total fungal population had inverse relation with increasing radiation dose and complete inhibition was observed when irradiated at 6 kGy and no further fungal proliferation was seen during three months storage at ambient conditions.

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15,335 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 CONTENTS

 


344 KB
2 1 INTRODUCTION

 

1
526 KB
3 2 REVIEW OF LITERATURE

 

6
3,186 KB
4 3 MATERIALS AND METHODS

 

36
1,162 KB
5 4 RESULTS AND DISCUSSION

 

49
6,125 KB
6 5 SUMMARY

 

140
569 KB
7 6 REFERENCES

 

146
2,345 KB