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. 2018 Feb 6;9:73. doi: 10.3389/fpls.2018.00073

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Copyright © 2018 Ren, Wang, Bai, Wu and He.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Transverse and longitudinal curvature indices (CIs) of leaves and petioles. rp-2 and rp-9 are two genotypes of heading Chinese cabbage, rc-1, rc-2, rc-3, and rc-4 are four genotypes of non-heading Chinese cabbage, and rr-1 is one genotype of turnip. (A,B) CIs of leaves in different genotypes. (C,D) Transverse and longitudinal CIs of the inner to outer leaves of leafy heads of rp-2. 1–6 on the abscissa axis indicate six leaves with 1 as the innermost leaf and 6 as the outermost leaf. (E,F) Transverse and longitudinal CIs of petioles from the outer to inner leaf clusters in rc-1. 1–6 on the abscissa axis indicate six leaves with 1 as the innermost leaf and 6 as the outermost leaf. Error bars represent the standard deviation of more than 20 seedlings. The significant differences were referred to P < 0.001 (Student's t-test) between genotypes. ^*Indicates the significant difference.