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Title: Hyperspectral reflectance as a tool to measure biochemical and physiological traits in wheat

Journal Article · · Journal of Experimental Botany
DOI: https://doi.org/10.1093/jxb/erx421 · OSTI ID:1439796
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [4]
  1. CSIRO Agriculture, Canberra, ACT (Australia); Australian National Univ., Canberra, ACT (Australia). ARC Centre of Excellence for Translational Photosynthesis. Research School of Biology
  2. International Maize and Wheat Improvement Centre (CIMMYT), Mexico City (Mexico)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.
  4. Australian National Univ., Canberra, ACT (Australia). ARC Centre of Excellence for Translational Photosynthesis. Research School of Biology

Improving photosynthesis to raise wheat yield potential has emerged as a major target for wheat physiologists. Photosynthesis-related traits, such as nitrogen per unit leaf area (Narea) and leaf dry mass per area (LMA), require laborious, destructive, laboratory-based methods, while physiological traits underpinning photosynthetic capacity, such as maximum Rubisco activity normalized to 25 °C (Vcmax25) and electron transport rate (J), require time-consuming gas exchange measurements. The aim of this study was to assess whether hyperspectral reflectance (350–2500 nm) can be used to rapidly estimate these traits on intact wheat leaves. Predictive models were constructed using gas exchange and hyperspectral reflectance data from 76 genotypes grown in glasshouses with different nitrogen levels and/or in the field under yield potential conditions. Models were developed using half of the observed data with the remainder used for validation, yielding correlation coefficients (R2 values) of 0.62 for Vcmax25, 0.7 for J, 0.81 for SPAD, 0.89 for LMA, and 0.93 for Narea, with bias <0.7%. The models were tested on elite lines and landraces that had not been used to create the models. The bias varied between -2.3% and -5.5% while relative error of prediction was similar for SPAD but slightly greater for LMA and Narea.

Research Organization:
Australian National Univ., Canberra, ACT (Australia); Brookhaven National Lab. (BNL), Upton, NY (United States); CSIRO Agriculture, Canberra, ACT (Australia); International Maize and Wheat Improvement Centre (CIMMYT), Mexico City (Mexico)
Sponsoring Organization:
Australian Research Council (ARC); Grains Research & Development Corporation (Australia); National Council of Science and Technology (CONACYT) (Mexico); Secretariat of Agriculture, Livestock, Rural Development, Fisheries and Food (SAGARPA) (Mexico); USDOE
Grant/Contract Number:
SC0012704
OSTI ID:
1439796
Report Number(s):
BNL--114530-2017-JAAM
Journal Information:
Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 3 Vol. 69; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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