Spectral reflectance curves to distinguish glyphosate resistant weed biotypes from susceptible biotypes.

WEBER, CHRISTIAN; YANNICCARI, MARCOS EZEQUIEL; ACCIARESI, HORACIO

Congreso; 2012 Weed Science Society of America Annual Meeting; 2012

WSSA

Plant responses to biotic and abiotic stress could be determined through optical remote sensing. However there is no information about differences in reflections spectra obtained by remote sensing that different biotypes of same species can shown. In this work by using spectral signatures in the range 350-900nm (at 1nm resolution), we studied the spectral response of Lolium perenne biotypes, obtained from crosses between resistant and susceptible to glyphosate. No substantive differences in the visible spectral range (400-950 nm) where observed for the different genotypes. This spectral response is determined by pigments. Moreover, spectral differences were detected in the far red (770 nm) and near infrared (800-900 nm) range. Here, the leaves reflectance is due to the internal structure of the leaf that affects the refractive index. These results suggest that is possible to determine by means of remote sensing the resistance degrees of perennial ryegrass biotypes to glyphosate.