Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810102673
Authors: ABDUL KHADAR BIRADAR
Advisor: PRABHURAJ, A.)
Other: A. NAGANAGOUD., M. SRINIVASA RA., A.G. SREENIVAS., R. V. BELADHADI
Title: EFFECT OF ELEVATED CARBON DIOXIDE ON GROWTH AND DEVELOPMENT OF Helicoverpa armigera (HÜBNER) ON CHICKPEA
Publisher: UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR
Citation: ---
Language: en
Type: Thesis
Pages: 116
Agrotags: null
Keywords: CARBON DIOXIDE, CHICKPEA,
Abstract: ABSTRACT Rising atmospheric carbon dioxide (CO2) concentration is expected to change plant nutritional quality thereby alters the plant-insect interactions. The effect of elevated CO2 on the foliar chemistry of chickpea (Cicer arietinum L.) and the consequences of these biochemical changes on the performance of pod borer, Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) was investigated. Foliage of chickpea plant grown under ambient (380 ± 25 ppm) and elevated-I and elevated-II CO2 (550 ± 25 and 700 ± 25 ppm) conditions inside the open top chambers (OTCs) was used for estimation of biochemical analysis and also used for feeding trials. Plants grown under elevated CO2 had lower nitrogen content and higher carbon and C: N ratio whereas, no significant difference was observed with respect to phenol content. The increased consumption per larvae of H. armigera fed on chickpea leaves grown under elevated CO2 conditions (1649.54 and 1590.62 mg in elevated CO2 conditions) compared to ambient (1254.59 mg). The similar trend was also observed in the larvae fed on leaf composed artificial diet. As the consequences of this the larva produced more feces and higher weight gain than those fed on ambient food. Longer larval duration and differential pupal weight was observed under elevated CO2 condition than ambient. Reduced fecundity of 373.25 and 383.87 eggs/female was observed under elevated-I and elevated-II condition respectively compared to ambient (463.87) in indirect situation. The similar trend was also followed for the larva fed on artificial diet (direct situation). The present findings indicated that elevated CO2 levels significantly altered the quality of chickpea foliage resulting in higher food consumption rate (RCR) to the tune of 31.06 and 30.57 mg g-1day-1 compared to ambient (22.36 mg g-1day-1) in indirect situation whereas, 53.30, 52.16 and 36.46 mg g-1day-1 was recorded under direct situation. The higher approximate digestibility (AD) and slower growth rate (RGR) and lesser efficiency parameters such as efficiency of conversion of ingested and digested food (ECI and ECD) was noticed in both direct and indirect situation under elevated CO2 condition compared to ambient.
Description: ---
Subject: Agricultural Entomology
Theme: ---
Research Problem: ---
These Type: M.Sc
Issue Date: 2012-06-05
Appears in Collections:Thesis

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