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. 2020 Jun 17;11:762. doi: 10.3389/fpls.2020.00762

FIGURE 2.

FIGURE 2

Anatomy of storage roots and environmental factors influencing storage root development. (A) Root cross-sections of major root crops including cassava, sweet potato, carrot, sugar beet, and radish. Cross-sections of cassava, sweet potato, and radish were stained with toluidine blue. Images for sugar beet and cassava were adapted from Barba-Espin et al. (2018) and Mehdi et al. (2019), respectively, which are distributed under the Creative Commons Attribution 4.0 International Licenses (https://creativecommons.org/licenses/by/4.0/). Arrow heads point to cambia. Xy, xylem side; and Ph, phloem side. (B) A simplified scheme depicting resource relocation from source (leaves) to sink (roots); and environmental factors influencing storage root formation and biomass in root crops. SUT, sugar transporter; CC, companion cell; PD, plasmodesmata; SE, sieve element; and SC, sink cell. On the right panel, the width of each triangle represents the influencing level of environmental factors on shoot growth (blue color) and storage root growth (red color).