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. 2019 Jan 22;9:249. doi: 10.1038/s41598-018-36971-3

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Photosynthesis and stomatal conductance of control and inoculated groups. Asterisks indicate significant differences between control and inoculated groups at P ≤ 0.05. All values are expressed as means ± SE. The blue background color indicates the well-watered period, yellow indicates the moderate drought period before soil moisture declined to zero (days 99–117), and pink indicates the severe drought period after soil moisture declined to zero (days 118–131). Mean photosynthesis of the inoculated group during the entire moderate drought period before soil moisture declined to zero (days 99–117, yellow background) was significantly greater than that of controls (P = 0.027). Mean stomatal conductance of the inoculated group during the entire severe drought period after soil moisture declined to zero (days 118–131, pink background) was significantly lower than that of controls (P = 0.042).