Table 5. Path analyses between mean weight diameter (MWD) and arbuscular mycorrhizal (AM) colonization, root total length, hyphal length, or soil GRSP fractions in 37 μm nylon-mesh separated root/hyphae and root-free hyphae chambers.

	Direct effect		Indirect effect		Total effect
Independent variable	Root/hyphae chamber	Hyphae only chamber	Root/hyphae chamber	Hyphae only chamber	Root/hyphae chamber	Hyphae only chamber
AM colonization	0.63*	NA	0.35	NA	0.98**	NA
Root total length	0.08	NA	0.56	NA	0.64*	NA
Hyphal length	0.16	0.30	0.73	0.40	0.89**	0.70*
EE-GRSP	13.41*	7.70	−12.55	−6.76	0.86**	0.94**
DE-GRSP	13.60*	11.29	−12.93	−10.89	0.67*	0.40
T-GRSP	−22.21	−15.69	23.14	16.39	0.93**	0.70*

Note: Trifoliate orange seedlings were 5-month-old and colonized with Funneliformis mosseae and Paraglomus occultum and grown in 37 μm nylon-mesh separated two-chambered perspex pots. *, P < 0.05; **, P < 0.01. Abbreviations: DE-GRSP, difficultly-extractable glomalin-related soil protein (DE-GRSP); EE-GRSP, easily-extractable glomalin-related soil protein; NA, not available; T-GRSP, total (EE-GRSP + DE-GRSP) glomalin-related soil protein.