Describing head shapes of white stem borers (Schirpophaga innotata Walker) that are able to survive on different rice types using Landmark based geometric morphometrics
Journal Title: Extreme Life, Biospeology & Astrobiology - International Journal of the Bioflux Society - Year 2012, Vol 4, Issue 1
Abstract
Rice stem borers are considered as the most serious insect pest of rice in Asia. It infects its plant host by burrowing into the stem using its mandible. However, apart from the mandible, the head of rice stem borers is also associated in the incursion process since it facilitates the entry of larvae to the rice plant. Differences in the head capsules have a direct effect on the ability of the insects to ingest hard foods rapidly. Different rice varieties in the Philippines serve as plant host for this pest and infestation occurred in different geographical location. Variations in habitat and plant host were thought to generate environmental variation in morphometric traits and host adapted herbivore phenotype respectively. Landmark based geometric morphometric analysis was used to assess the hypothesis that the head shape of white stem borer differ between populations with respect to different rice varieties and geographical location where it was obtained. Relative warp analysis showed variation in the head shape between different white stem borer (Schirpophaga innotata Walker) populations infesting different varieties of rice. Non-significant head shape variations were obtained between geographically separated populations. These results indicate that the rice host varieties play an important role in the selection of individuals that are able to counteract the resistance factors in plants.
Authors and Affiliations
Queenilyn Albutra, Mark Torres, Cesar Demayo
Keywords
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