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. 2023 Aug 31;12(17):3134. doi: 10.3390/plants12173134

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© 2023 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 (https://creativecommons.org/licenses/by/4.0/).

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Principal Component Analysis (PCA). Scatter plots of parameters investigated in soybean (A) and cowpea (B) cultivars under different water availability levels (75, 60, 45, and 30% of field capacity—FC). The X and Y axes indicate the percentage of variance explained by each Principal Component (PC). The loading plot displays the contribution of the following parameters: shoot fresh mass (SFM), root fresh mass (RFM), and total fresh mass (TFM); shoot dry mass (SDM), root dry mass (RDM), and total dry mass (TDM); relative tolerance to drought (RToler); relative water content (RWC); membrane damage in leaves (MD_leaf) and roots (MD_root); contents of chlorophyll a (Chl_a), chlorophyll b (Chl_b), total chlorophyll (Chl_t), and carotenoids (Carot); contents of soluble carbohydrates (SC_leaf), free amino acids (AA_leaf), and proline (Pro_leaf) in the leaves.