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Agronomic characteristics of annual Trifolium legumes and nutritive values as predicted by near-infrared reflectance (NIR) spectroscopy

Li, X., Ison, R. L., Kellaway, R. C., Stimson, C., Annison, G. and Joyce, D. C. (2011) Agronomic characteristics of annual Trifolium legumes and nutritive values as predicted by near-infrared reflectance (NIR) spectroscopy. Crop and Pasture Science, 62 (12). pp. 1078-1087.

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Article Link(s): http://doi.org/10.1071/CP10158

Publisher URL: http://www.publish.csiro.au/cp/pdf/CP10158

Abstract

A range of annual legume genotypes comprising one line of Trifolium subterraneum, four lines of T. michelianum, 11 of T. resupinatum var. resupinatum, and one line of T. resupinatum var. majus were grown in glasshouses under temperature regimes of 10-15°C and 16-21°C. Dry matter (DM) weights of stem, leaf, and flower tissues were measured when plants had six nodes, at first flower appearance, and at senescence. All samples were scanned by near-infrared reflectance spectroscopy (NIRS). One-third of the samples, covering the range of spectral characteristics, were analysed for in vitro digestible organic matter (DOMD), organic matter, crude protein (CP), neutral detergent fibre (NDF), lignin, cellulose, and the hemicellulosic polysaccharide monomers arabinose, xylose, mannose, galactose, and rhamnose. These data were used to develop calibration equations from which the composition of the remaining samples was predicted by NIRS. The higher temperature resulted in plants reaching respective phenological stages earlier, but did not affect either DM yields of total plant, stem, leaf, and petiole tissues or the proportions of each fraction. In vitro DOMD and arabinose and galactose levels decreased, while lignin, cellulose, NDF, xylose, mannose, and rhamnose levels increased with advancing maturity. In vitro DOMD was positively associated with contents of CP, arabinose, galactose, and the arabinose/xylose ratio and was negatively associated with contents of lignin, cellulose, NDF, xylose, mannose, and rhamnose. Lignin contents were highly correlated with levels of both xylose and mannose. Stems were more digestible than leaves in subterranean clover and T. resupinatum var. majus. The study also demonstrated that NIRS can be used routinely as a quick, inexpensive, and reliable laboratory technique to predict feed components of annual Trifolium legumes. © 2011 CSIRO.

Item Type:Article
Keywords:annual legume cell wall polysaccharides morphology NIRS yield. agronomy annual plant dry matter growth rate high temperature infrared spectroscopy legume nutritive value phenology polysaccharide prediction senescence Trifolium Trifolium michelianum Trifolium resupinatum Trifolium subterraneum
Subjects:Science > Botany > Genetics
Plant culture > Field crops > Forage crops. Feed crops
Deposited On:28 Mar 2019 02:24
Last Modified:28 Mar 2019 02:24

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