Quantifying Architectural Traits of Amaranths
Quantifying Architectural Traits of Amaranths by 3-Dimensional Digitization
Morphological or structural variations in amaranth species translate into different dry matter yields. Dry matter yield which is a product of plant growth is an interaction between plant architecture and the environment. Both plant architecture and the environment influence physiological processes including photosynthesis which drives dry matter production. Plant architecture or structure is the 3-dimensional representation of plant organs. The shape, size and orientation of the organs constitute the geometry whiles the type of organs and the connectivity between them forms the topology. Current technologies use contact and non contact methods to capture plant architectural features.
The most common non contact method uses the 3-D Fastrak magnetic digitizer to acquire plant features for the reconstruction of the plant. The reconstructed plant architecture serves as a model for analysing the captured resources, particularly photosynthetic active radiation or photosynthetic photon flux density use for dry matter production. Light interception for photosynthesis in a plant canopy, depends on plant architectural traits mainly, leaf shape, leaf size, leaf orientation (azimuth or inclination angle) and internode length. To our knowledge 3-d digitization method has not been used on amaranths. Therefore, the objective of this study is to use 3-D digitizing to quantify the differences in architectural traits in some selected amaranth species and further relate it to their dry matter yields.
Mildred Osei-Kwarteng et al