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. 2019 Jan 28;20(3):534. doi: 10.3390/ijms20030534

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© 2019 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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Principal component analysis (PCA) of the metabolites annotated in developing grape berry skin. Circle and triangle donate traditional cultivation (RC) and root restriction (RR) cultivation method, respectively. Green, blue, brown, yellow, and cyan colors represent samples collected at S1, S2, S3, S4, S5 stage, respectively. S1, eight weeks after full bloom (WAFB); S2, ten WAFB; S3, 12 WAFB; S4, 14 WAFB; S5, 16 WAFB (berry maturation). Principle Component (PC) 1 explains 40% of variance distinguishing grape berry skin samples from different developmental stages. PC2 explains 14.7% of variance distinguishing skin samples from different cultivation methods.