Abstract
Aims
We examined novel ways of non-destructively measuring root weight, plant growth and water use efficiencies to improve the detection of treatment effects in plant phenotyping in pot culture.
Method
Two genotypes each of maize, sunflower and soybean were grown in 4 L ANOVApot®s in the Twinpot Water Management System (TWMS) of a constant water table. Measurement of pot weights and pot water losses (weekly and by drip rate) over time allowed the derivation of plant biomass gain and Water Use Efficiences (WUE). The destructive harvest at 31 days provided weights of plant parts and derived estimates of fresh root weight without physical recovery.
Results
Derived estimates of whole plant biomass were highly correlated with harvested whole plant dry weights (r = 0.97) and fresh shoot weights (r = 0.99), while estimates of non-recovered fresh root weights were highly correlated with harvested shoot fresh weights (r = 0.86) and recovered root fresh weights (r = 0.85). WUEs based on actual water loss and drop counts varied significantly across species and between maize cultivars.
Conclusions
Constant water table plant culture in pots allows measures of roots without physical recovery, in situ crop growth and WUEs based on water losses and drip rates.
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Acknowledgements
We gratefully acknowledge the support of Ken Hayes, manager of the University of Queensland, Glasshouse Services and his team, Del Greenway for her biometrical advice and Professor Ram Dalal for his comprehensive review, with useful suggestions, of the final manuscript.
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The first author, M.N. Hunter invented a plant pot now called the ANOVApot® (a version of which is described in this paper), and is a director and has shares in Anova Solutions P/L (ACN 088443752) that has been assigned patent rights that apply to the 5 sizes of the ANOVApot® in Australia, New Zealand, US and Europe.
All other authors declare that they have no conflict of interest.
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Hunter, M., Leong, G., Mitchell, J. et al. Constant water table sub-irrigation of pots allows derivation of root weights (without physical recovery) and repeated measures of in situ growth and water use efficiencies. Plant Soil 425, 1–19 (2018). https://doi.org/10.1007/s11104-017-3536-y
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DOI: https://doi.org/10.1007/s11104-017-3536-y