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. 2020 Sep 30;9(10):1293. doi: 10.3390/plants9101293

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Time course of moisture-induced microcracking. Microcracking of the cuticle was indexed by quantifying the percentage of treated area infiltrated with acridine orange. The experiment comprised two phases: The first period of moisture exposure (Phase I) and the second period after termination of moisture exposure (Phase II). The end of Phase I and the beginning of Phase II is indicated by the dashed vertical line. The moisture treatment is referred to as ‘wet/dry’ and the control as ‘dry/dry.’ Data symbols present means ± SE (n = 6 to 20).