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Forests 2014, 5(3), 466-481; doi:10.3390/f5030466
Article

Comparison of Pyrolysis Mass Spectrometry and Near Infrared Spectroscopy for Genetic Analysis of Lignocellulose Chemical Composition in Populus

1
, 2
, 1,3
 and 1,3,*
Received: 15 January 2014; in revised form: 7 March 2014 / Accepted: 12 March 2014 / Published: 21 March 2014
(This article belongs to the Special Issue Improving Wood Quality from Planted Forests)
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Abstract: Genetic analysis of wood chemical composition is often limited by the cost and throughput of direct analytical methods. The speed and low cost of Fourier transform near infrared (FT-NIR) overcomes many of these limitations, but it is an indirect method relying on calibration models that are typically developed and validated with small sample sets. In this study, we used >1500 young greenhouse grown trees from a clonally propagated single Populus family, grown at low and high nitrogen, and compared FT-NIR calibration sample sizes of 150, 250, 500 and 750 on calibration and prediction model statistics, and heritability estimates developed with pyrolysis molecular beam mass spectrometry (pyMBMS) wood chemical composition. As calibration sample size increased from 150 to 750, predictive model statistics improved slightly. Overall, stronger calibration and prediction statistics were obtained with lignin, S-lignin, S/G ratio, and m/z 144 (an ion from cellulose), than with C5 and C6 carbohydrates, and m/z 114 (an ion from xylan). Although small differences in model statistics were observed between the 250 and 500 sample calibration sets, when predicted values were used for calculating genetic control, the 500 sample set gave substantially more similar results to those obtained with the pyMBMS data. With the 500 sample calibration models, genetic correlations obtained with FT-NIR and pyMBMS methods were similar. Quantitative trait loci (QTL) analysis with pyMBMS and FT-NIR predictions identified only three common loci for lignin traits. FT-NIR identified four QTLs that were not found with pyMBMS data, and these QTLs were for the less well predicted carbohydrate traits.
Keywords: FT-NIR; quantitative trait loci (QTL); Populus; pyMBMS; lignin; S-lignin; G-lignin; S/G ratio; C5; C6; clonal repeatability; genotypic correlations FT-NIR; quantitative trait loci (QTL); Populus; pyMBMS; lignin; S-lignin; G-lignin; S/G ratio; C5; C6; clonal repeatability; genotypic correlations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Zhang, J.; Novaes, E.; Kirst, M.; Peter, G.F. Comparison of Pyrolysis Mass Spectrometry and Near Infrared Spectroscopy for Genetic Analysis of Lignocellulose Chemical Composition in Populus. Forests 2014, 5, 466-481.

AMA Style

Zhang J, Novaes E, Kirst M, Peter GF. Comparison of Pyrolysis Mass Spectrometry and Near Infrared Spectroscopy for Genetic Analysis of Lignocellulose Chemical Composition in Populus. Forests. 2014; 5(3):466-481.

Chicago/Turabian Style

Zhang, Jianxing; Novaes, Evandro; Kirst, Matias; Peter, Gary F. 2014. "Comparison of Pyrolysis Mass Spectrometry and Near Infrared Spectroscopy for Genetic Analysis of Lignocellulose Chemical Composition in Populus." Forests 5, no. 3: 466-481.


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