Relationships between Phenotypes and Chemotypic Characteristics of Local <i>Gymnema inodorum</i> Plants in Northern Thailand

Abstract

Gymnema inodorum (Lour.) Decne or Chiang Da, the local northern Thai vegetable, is renowned for its anti-diabetic and hypoglycemic properties and is highly sought after by the functional food industry. This research investigated the relationship between the physiological characteristics, genetic variation, and chemical compositions of different Chiang Da accessions. Two commercial lines (COM1 and COM2) and eight local accessions (BAC1-8) of Chiang Da were gathered and maintained in the same study plot for the investigation of their morphological characteristics, genetic variation, and nutritional and phytochemical constituents. From the morphological data, the two commercial lines were clearly distinctive with their closely related leaf structures. Random amplification of the polymorphic illustrated the genetic diversity between the local accessions and commercial strains in a similar pattern as described by their morphology characteristics and proximate contents. The phytochemical characteristics, nonetheless, projected the two commercial lines in separate groups. The outcome of this study could be beneficial toward the selection of the Chiang Da strains with specific traits for plant breeding programs of functional food interest.

Keywords

• antioxidant
• genetic diversity
• gymnemic acid
• principal component analysis
• RAPD