Table 2.

Parameters for mycorrhizal primary and secondary infection, and growth of external hyphae.

symbol	parameter name	units	value	source
P	probability of primary infection for dispersed inoculum	cm−1 d−1	0.15	assumption
minAge	minimal infection age of a root segment	d	0	assumption
maxAge	maximal infection age of a root segment	d	32	[42]
vi	rate of internal infection front	cm d−1	0.13	[36,43]
maxInfection	percentage of maximal infection	—	1	assumption
v	tip elongation rate	cm d−1	0.13	[25]
ah	hyphal radius	µm	50	[43]
b	branching rate	d−1	0.5	[25]
hlt	hyphal lifetime	d	10	[25]
θh	branching angle	°	60	[44,45]
distTT	threshold for tip–tip anastomosis	cm	0.00	assumption (the value zero deactivates anastomosis)
distTH	threshold for tip–hyphae anastomosis	cm	0.00	assumption (the value zero deactivates anastomosis)
de	distance between entry pointsa	cm	0.1	[36,43]
dt	time step for alteration between root growth and infection model	d	1	choice based on root elongation rate

^aUsed for spatial discretization of roots, i.e. dx = d_e.