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. 2016 May 26;7:719. doi: 10.3389/fpls.2016.00719

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Copyright © 2016 Yuan, Cao, Zhang, Ata-Ul-Karim, Tian, Zhu, Cao and Liu.

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) or licensor 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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Relationships between di-positional SPAD readings and chlorophyll concentration (Chla+b) at panicle initiation growth stage. Di-positional SPAD readings were regressed with chlorophyll concentration of LFT1 (A1–D1), LFT2 (A2–D2), LFT3 (A3–D3), and LFT4 (A4–D4). LFT1-4 represent the first, second, third, and fourth fully expanded leaf from top. SPADa, SPADb and SPADc are the SPAD readings detected at the 1/3, 1/2, and 2/3 of the distance from the leaf base, respectively. SAPDabc is the average values of SPADa, SPADb and SPADc. ^**significant at p < 0.01. The solid line denotes the linear regression and the dotted lines represent the confidence bands (p = 0.95). The analysis was performed by least-squares method with IBM SPSS version 21.0 software.