ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

ˇ@

    

ˇ@

ˇ@

Graduate Students' Thesis Abstract

Papitchaya Teawkul  07, 2015

Elevated of CO2 and AM fungi effect on tomato plant and subsequently on Spodoptera litura performance

ˇ@

The elevated carbon dioxide (CO2) in the atmosphere due to climate change has been found to impact the relative amount of carbon and nutrients in the plants. The changes in plant chemistry are major factors resolving the value of a plant as a food source to herbivorous insects. However, past studies most focused on effects of CO2 on temperate forest trees; little is known about effects of elevated CO2 on crop plants in the subtropical areas. The purpose of this study assessed the effect of elevated CO2 and soil microbial on chemistry, performance of plant and their insect pest. This thesis can be divided into two chapters; in chapter one, the effects of CO2 on tomato plant (Lycopersicon esculentum Mill.) performance, chemistry, and subsequently on Spodoptera litura performance had been investigated. The results indicated that the elevated CO2 had positive effect on tomato plantˇ¦s performance. However, elevated CO2 negatively affected plant nutrition. In addition, the raised CO2 concentration had negative impact on the growth performance of S. litura larvae. Besides the effects of elevated CO2, the effect of beneficial microorganism is known for the promotion of plant growth and the improvement of the plant nutrition status. Only handful studies have focused on the interaction of elevated CO2 and arbuscular mycorrhizae (AM) fungi to plants and insects. The objective of the second chapter of this study assessed the effect of elevated CO2 and AM fungi on tomato plant growth, foliar chemistry, and on subsequently S. litura performance. This research revealed that both the elevated CO2 and AM fungi can strongly influence the physiology and foliar chemistry of tomato plants. Moreover, the changes of phytochemistry in the plants may play an important role in affecting the growth performance of insect.

ˇ@

Keywords: AM fungi  Elevated CO2  Plant-insect interaction  tomato  Spodoptera litura 

ˇ@

ˇ@

2006-2007 Copyright Insect-Plant Interaction Laboratory. All rights reserved.