Table 2. Average radial growth rates (mm/d) of WT and Δserf mutants.

Strain	Actual pH 5.0a				Actual pH 2.7a		Grand meanb
	Dark		Light		Light
LU132 WT	21.77	a	21.04	a	16.39	a	19.73	a
LU132 A	21.15	b	18.68	c	14.28	c	18.04	c
LU132 B	21.27	b	20.20	b	15.90	b	19.12	b
LU132 C	21.23	b	20.12	b	15.89	b	19.08	b
LU140 WT	20.54	c	18.31	cd	13.27	de	17.37	d
LU140 D	20.57	c	17.58	e	12.99	e	17.05	d
LU140 E	20.62	c	17.91	de	13.39	d	17.31	d
LU140 F	20.70	c	18.03	d	13.18	de	17.30	d
l.s.d.c	0.219		0.404		0.337		0.337

Notes.

Growth rate data for LU132 and LU140 wild types (WT) and Δserf mutants (A–F). Values are averages of two experiments with four replicates. Different letters within a column represent significantly different values (P < 0.05).

^aThe pH was adjusted to 5.0 and 2.4. Before inoculation, the actual pH of the plates was measured.

^bGrand mean is the average of the three conditions.

^cThe grand mean l.s.d. was determined using a split-plot design.