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. 2019 Feb 4;10:52. doi: 10.3389/fpls.2019.00052

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Copyright © 2019 Wang, Zhang, Bi, Liu, Xu, Yu, Cao, Zhu, Wu, Zhan, Anis, Yu, Chen, Cheng and Cao.

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(s) 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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Ultrastructure of the chloroplast; senescence related-indices of ZH8015 and es4 at 70 dps. Photosynthetic ability analysis in flag leaves of ZH8015 and es4 at 70 dps. Senescence related-indices of ZH8015 and es4 at 70 dps. (A,C) Ultrastructure of the chloroplast in the flag leaf of ZH8015 at 70 dps. (B,D) Ultrastructure of the chloroplast in the flag leaf of es4 at 70 dps. CP, chloroplast; G, granum; M, mitochondrion; OG, osmiophilic granule; S, starch granule. Scale bar = 0.2 μm. (E) Content of chlorophyll a and b. (F) Net photosynthetic rate (P_n). (G) The enzymatic activities of catalase (CAT). (H) The content of H₂O₂. (I) The content of malondialdehyde (MDA). (J) The enzymatic activities of peroxidase (POD). (K) The enzymatic activities of superoxide dismutase (SOD). (L) The content of soluble proteins (SP) (mean ± SD, n = 3), ^∗ significance at P < 0.05, ^∗∗extremely significance at P < 0.01.