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. 2019 Feb 19;10:103. doi: 10.3389/fpls.2019.00103

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Copyright © 2019 Hatfield and Dold.

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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Response of water use efficiency in cotton leaves as a function of changing CO₂ and incident light levels at a constant wind speed of 2.4 cm sec^-1. Data redrawn from Bierhuizen and Slatyer (1965).