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. 2021 May 25;150(1-3):295–311. doi: 10.1007/s11120-021-00847-x

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — Trends in grain yield, net photosynthesis, and chlorophyll a/b ratio at the silking and filling stages over the hybrid release year. Y, grain yield; PnS, P_n at silking stage; PnM, P_n at maturity; A/BS, chlorophyll a/b at silking stage; A/BF, chlorophyll a/b ratio at filling stage. Data from previous studies, including maize varieties released between the 1970–1990 decades, were integrated into this figure (Zhang et al. 1992; Ding et al. 2006; Zhang et al. 2011; Li et al. 2015)