A New Phenotyping Pipeline Reveals Three Types of Lateral Roots and a Random Branching Pattern in Two Cereals

Plant Physiology
Sixtine PassotYann Guédon

Abstract

Recent progress in root phenotyping has focused mainly on increasing throughput for genetic studies, while identifying root developmental patterns has been comparatively underexplored. We introduce a new phenotyping pipeline for producing high-quality spatiotemporal root system development data and identifying developmental patterns within these data. The SmartRoot image-analysis system and temporal and spatial statistical models were applied to two cereals, pearl millet (Pennisetum glaucum) and maize (Zea mays). Semi-Markov switching linear models were used to cluster lateral roots based on their growth rate profiles. These models revealed three types of lateral roots with similar characteristics in both species. The first type corresponds to fast and accelerating roots, the second to rapidly arrested roots, and the third to an intermediate type where roots cease elongation after a few days. These types of lateral roots were retrieved in different proportions in a maize mutant affected in auxin signaling, while the first most vigorous type was absent in maize plants exposed to severe shading. Moreover, the classification of growth rate profiles was mirrored by a ranking of anatomical traits in pearl millet. Potential dependenc...Continue Reading

Citations

Jun 10, 2020·Journal of Experimental Botany·Loïc PagèsGuillaume Pagès
Apr 16, 2019·Frontiers in Plant Science·Peng YuChunjian Li
Jul 20, 2019·Trends in Plant Science·Bertrand MullerXavier Draye
Aug 1, 2019·Trends in Plant Science·Jason BandaMalcolm J Bennett

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