Physico-structural Properties of Thunbergia grandiflora Roxb: Understanding the Mechanisms on How It Kills its Host Plant

Abstract
Basic properties of Thunbergia grandiflora Roxb. (sky flower) were investigated to determine the mechanisms on how the plant effectively kills its host and to find an alternative way to control its population. Overall green weight of a 21 m long vine was 3,045 g. The parameters influencing this overall green weight of the plant were identified. When ranked based on its contribution to stem weight it follows the trend: stem biomass > moisture content > diameter > phloem > fiber. T. grandiflora provided an added load to the host plant leading to the suppression of the growth and development of its host. Its leaves would then fully cover the host plant preventing the host from receiving sunlight. This combined action suffocated the host plant to death. Possible control measure was to utilize the plant. Fiber characteristics were measured to determine its suitability for pulp and paper production. When compared to selected fast growing trees species that are commonly used in pulp and paper production, the vine was very much similar to them. However, fiber morphological indexes e.g., felting power, elasticity coefficient, rigidity coefficient, Runkel’s ratio and Mulsteph’s ratio; revealed that the vine was less suitable for pulp and paper production due to its very thick fiber cellwall. Keywords - Thunbergia grandiflora Roxb, bioinvasive, green weight, Fiber morphological indexes, stem biomass, embolism, Philippines