Table 1.

The thickness, radius, and ratio of each part of the anatomical structure in the ECM formation period of Q. mongolica.

Treatment		Root Radius (μm)	Vascular Bundle Radius (μm)	Vascular Bundl Radius/Root Radius	Cortical Cells Thickness (μm)	Fungus Sheath Thickness (μm)
Control group	10 d	42.46 e	22.96 f	0.54 b	─	─
	20 d	44.74 e	24.08 e	0.54 b	─	─
	30 d	52.20 d	40.19 a	0.77 a	─	─
G. viscidus group	10 d	70.34 c	24.91 e	0.35 c	47.58 c	16.43 a
	20 d	75.98 b	26.56 d	0.35 c	50.52 b	16.98 a
	30 d	81.27 a	27.42 cd	0.34 d	54.48 a	17.17 a
S. luteus group	10 d	77.37 b	26.37 d	0.34 cd	50.94 b	14.31 b
	20 d	79.99 ab	28.41 c	0.36 c	51.62 b	17.81 a
	30 d	81.88 a	30.93 b	0.38 c	51.23 b	17.70 a

Note: Different lowercase letters within columns indicate significant differences at p < 0.05.