Prediction of seed coat proportion in narrow-leafed and yellow lupins by near-infrared reflectance spectroscopy (NIRS)
D. Alomar A D , M. Mera B C , J. Errandonea A and H. Miranda CA Facultad de Ciencias Agrarias, Universidad Austral de Chile, Valdivia 5090000, Chile.
B Instituto Investigaciones Agropecuarias, INIA-Carillanca, Temuco 4780000, Chile.
C Facultad de Ciencias Agropecuarias y Forestales, Universidad de La Frontera, Temuco 4811230, Chile.
D Corresponding author. Email: dalomar@uach.cl
Crop and Pasture Science 61(4) 304-309 https://doi.org/10.1071/CP09257
Submitted: 8 September 2009 Accepted: 19 January 2010 Published: 12 April 2010
Abstract
Breeding programs oriented to decrease hull percentage in lupins and consequently to improve their nutritional value could be greatly assisted by a reliable technique to predict seed coat proportion (SCP) in whole, intact seeds. The objective of this work was to evaluate the potential of near-infrared reflectance spectroscopy (NIRS) to predict the percentage of seed coat in two lupin species. Samples (n = 627) of seeds of different lines and crosses of narrow-leafed lupin (Lupinus angustifolius, n = 447) and yellow lupin (L. luteus, n = 180) were scanned in the VIS-NIR range and SCP subsequently determined by dissection and weighing of dry seed fractions (reference data). Calibrations were developed by multivariate regression (modified partial least squares (PLS)), testing different mathematical treatments. The best equation was obtained when both species were pooled in one set of samples and the best treatment of the spectral data consisted in a second subtraction order, over an interval of 8 data points (16 nm) and a smoothing segment of 8 data points. Cross validation for the selected equation showed a coefficient of determination of 88% and a standard error of 0.54%, for an average SCP of 22.63% and a standard deviation of the reference data of 1.55%. It was concluded that NIRS can be effectively applied in breeding programs as a fast, non-destructive screening tool to determine SCP in narrow-leafed and yellow lupins.
Additional keywords: Lupinus angustifolius, Lupinus luteus, lupin hull, near-infrared reflectance.
Acknowledgments
This work was supported by a grant from CONICYT (Chilean Board for Scientific and Technological Research) through FONDECYT Project 1070232. We thank the Department of Agriculture and Food of Western Australia for providing varieties and lines of narrow-leafed lupin that served as parents to generate material used in our study.
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