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. 2018 Apr 17;9:485. doi: 10.3389/fpls.2018.00485

FIGURE 3.

FIGURE 3

Multivariate analysis of metabolome, and physiological parameters in needles during heat treatment. (A) Classification of the different samples according to sPLS. Components 1 and 2 allowed the clustering of treatments analyzed according to shorter-term (T1/2, T1, T2, and T3) and longer-term (T5 and R) heat-stress responses. (B) Interaction networks constructed after sPLS analysis using metabolites as the predictor matrix and physiological measurements as the response matrix. Edge color represents the correlation value. Only those correlations equal or higher, in absolute value, than 0.6 are shown. Color nodes reflect the amount of control that this node exerts over the interactions of other nodes in the network (higher control = lighter color). EL, electrolyte leakage; ZR, zeatin riboside; iPA, isopentenyl adenosine; IAA, indol-3-acetic acid; DHZR, dihydrozeatin riboside; BK, castasterone; GA7, gibberellin 7; C, control; R, recovered; T1/2, 3 h after 40°C on day 1; T1 6-h heat exposure on day 1; T2, day 2; T3, day 3; T5, day 5.