Theses and Dissertations

Date of Award


Document Type


Degree Name

Master of Science (MS)



First Advisor

Dr. Rupesh Kariyat

Second Advisor

Dr. Veerachandra K. Yemmireddy

Third Advisor

Dr. Frank Dirrigl


Chapter 1: This chapter provides a review of recent and critical literature on the role of polyphenols in mediating plant-insect interactions. I particularly focused on plant defense induction and mode of action of polyphenols, defense fitness trade-offs, and storage of polyphenols for future defense responses.

Chapter 2: This chapter is about the effects of polyphenol rich purple corn pericarp extract on the growth and development of generalist caterpillar i.e., fall armyworm (Spodoptera frugiperda). This study shows that purple corn pericarp extract rich in polyphenols negatively effects the growth and development of S. frugiperda.

Chapter 3: This chapter is focused on the role of diet variation in oviposition success and progeny growth of tobacco hornworm (Manduca sexta). In this study I show that alteration in diet plays differential role in oviposition and progeny success of M. sexta. M. sexta fed on tomato had higher egg laying and hatching capacity than four Solanum species. This could be due to higher PPO amount and trichome density in four Solanum species than tomato plants.

In conclusion, our results indicates that plants have different suites of defenses that defend them against insect herbivores. Also, plant secondary metabolites play important role in plant defenses and protect them from insect pests.


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