Chemotypic Variation of Caryophyllene Derivatives in Cotton Germplasm Lines

Cotton plants (Gossypium) produce secondary metabolites classified as volatile organic compounds (VOCs). VOCs are widely-known to have several biological properties, including chemotactic or insecticidal activities against cotton pests. β-caryophyllene and its derivatives are VOCs reported in various plant species that help mitigate both insect and microbial pests. The presence of caryophyllene derivatives, such as 12-hydroxy-B-caryophyllene acetate (CA), in Gossypium armourianum germplasm lines was determined by gas chromatography-mass spectrometry (GC\MS). Chemotypic characterization by GC/MS maybe be a valuable tool in the screening and breeding of cotton plant with particular chemical profiles known to influence insect pest activities.