Leaflet shape analysis separates rose cultivars and estimates leaf area

Authors : Mansour MATLOOBİ, Sepideh TAHMASEBİ, Faribourz ZARE NAHANDİ, Alireza MOTALLEBİ-AZAR

Pages : 220-226

Doi:10.7161/omuanajas.484655

View : 13 | Download : 8

Publication Date : 2019-10-15

Article Type : Research Paper

Abstract :Trying to use tip leaflet of rose plants as a sample to estimate leaf area and to separate rose cultivars, in an experiment we took leaf images from three different stem layers of four garden roses. After preliminary image pre-processing measures, some important leaf geometric features such as leaf and leaflet area, perimeter, circularity and leaflet length and width were measured or calculated. Analysis of variance showed that it would be possible to separate rose cultivars by including only two leaf properties, i.e., tip leaflet angle and leaflet area to leaf area ratio. It was also determined that three leaf layers along the rose stem can be recognized and categorized by implementing just angle of tip leaflet. Leaflet area was agreeably approximated by fitting a simple linear model to the product of leaflet minor and major axes. Further analyses indicated that some leaflet properties such as solidity, perimeter and circularity can be used as significant criteria to distinguish rose cultivars, however other features like leaflet elongation and rectangularity were quite poor and insignificant in this case. In conclusion, it was determined that rose leaflet tip angle not only has the ability of being as a good morphometric marker in separating rose stem leaf layers but also it is capable of identifying different rose cultivars. 
Keywords : image analysis, leaf morphometric features, leaf area, rose, Leaflet shape