Abstract
For many crops, the genomics revolution has given hope that breeding would become easier, faster, and more efficient. Relevant phenotyping is now the main bottleneck and new technologies provide opportunities for easier, faster, more sensitive, and more informative phenotyping. However, the phenotyping agenda must be driven by scientific questions rather than by a technological push, especially for complex constraints, such as drought. In this chapter, we provide a viewpoint on phenotyping and what it should take into account. Phenotyping is a full-fledge research effort, calling for a multidisciplinary effort between technology providers and several research disciplines, and which needs to address the issue of linking scales. Two phenotyping platforms are described; a lysimetric platform (LysiField) to assess the patterns of plant water use and relate these to grain yield, and an imaging platform (LeasyScan) to characterize crop canopy traits responsible for water savings. In both cases, the chapter discusses the thought process and the hypotheses around key traits for drought adaptation that were put in the development of these platforms. The chapter concludes with perspectives on the integration of high-throughput phenotyping (HTP) technology with breeding, starting with an analysis of the cost as a prerequisite to decide on its usage and adoption in breeding. It takes a few examples of current opportunities in the domain of imaging, trying to bring closer together what the technology can bring and what breeding pragmatically needs. In conclusion, while new technologies provide opportunities to make phenotyping easier, faster, better, cheaper, the risk of becoming the end that justifies the means can be avoided by driving the technology with research questions, made possible through a cross-discipline approach between genetics, breeding, modeling, engineering, physiology, and statistics.
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Acknowledgments
The authors are thankful for the funding from ICRISAT for the capital investment in the LeasyScan facility and to the Kirkhouse Trust fund for contributing to the acquisition of additional scales.
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Vadez, V., Kholova, J., Hummel, G., Zhokhavets, U. (2021). Got All the Answers! What Were the Questions? Avoiding the Risk of “Phenomics” Slipping into a Technology Spree. In: Zhou, J., Nguyen, H.T. (eds) High-Throughput Crop Phenotyping. Concepts and Strategies in Plant Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-73734-4_11
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