. 2022 May 13;10:e13346. doi: 10.7717/peerj.13346

Table 2. Correlations between the 18 quantitative anatomical variables retained and accumulated in Y₁ and Y₂ for the leaf of Eucalyptus camaldulensis, Eucalyptus grandis, Eucalyptus urophylla and Eucalyptus saligna and the first two main components (Y1 and Y2).

Original variables	Y₁	Y₂	Original variables	Y₁	Y₂
TLPP	0.9987	0.0492	%Ph	−0.5640	0.8062
NUS	0.9984	0.0548	CS	0.5582	0.7198
TL	0.9772	0.2124	TSP	−0.5534	0.5648
NLS	−0.9762	−0.1881	TLE	0.5527	−0.7287
TM	0.9758	0.2186	%UE	−0.4584	−0.8365
TUPP	0.9204	0.2303	%Chl	0.3943	−0.9055
%LE	−0.7627	−0.6427	%Col	0.2953	−0.6390
TUE	−0.7122	0.6655	MGA	−0.2374	0.9642
%Gl	−0.6077	0.7445	%Xy	0.2077	0.9431
%Retained	70.17	26.43	%Accumulated	70.17	96.6

Note:

TLPP, lower palisade parenchyma thickness; NUS, number of stomata/mm² of upper face; TL, leaf thickness (μm); NLS, number of stomata/mm² of the lower face in the internervural region; TM, mesophyll thickness; TUPP, upper palisade parenchyma thickness; %LE, Percentage of lower epidermis; TUE, thickness of the upper epidermis; %Gl, gland; %Ph, phloem; CS, total cross-sectional area (mm²) in the central rib region; TSP, spongy parenchyma thickness (μm); TLE, lower palisade parenchyma thickness; %UE, percentage of upper epidermis; %Chl, chlorenchyma; %Col, collenchyma; MGA, mean gland area; %Xy, xylem.

Table 2. Correlations between the 18 quantitative anatomical variables retained and accumulated in Y1 and Y2 for the leaf of Eucalyptus camaldulensis, Eucalyptus grandis, Eucalyptus urophylla and Eucalyptus saligna and the first two main components (Y1 and Y2).

Table 2. Correlations between the 18 quantitative anatomical variables retained and accumulated in Y₁ and Y₂ for the leaf of Eucalyptus camaldulensis, Eucalyptus grandis, Eucalyptus urophylla and Eucalyptus saligna and the first two main components (Y1 and Y2).