Physiological and biochemical responses of Egeria densa to different sediment redox conditions

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Table 2

Growth and stress responses of E. densa exposed to different dissolved H₂S concentrations (n = 3).

	H₂S concentration (mM)					F_(4,10)	P

	0	0.01	0.05	0.10	0.20
SGR (mm/day)	^*11.43 ± 1.4^a	12.38 ± 1.7^a	11.0 ± 2.1^a	8.57 ± 1.4^b	8.57 ± 2.5^b	2.53	0.01
RGR (mg/day)	12.24 ± 1.3^a	13.29 ± 1.3^a	11.05 ± 1.2^a	8.05 ± 0.3^b	6.5 ± 1.0^c	20.88	<0.01
Total Chl. (mg/g) FW	2.4 ± 0.2^a	2.4 ± 0.2^a	2.2 ± 0.1^a	1.7 ± 0.1^b	0.9 ± 0.1^c	53.1	<0.01
F_v/F_m	0.81 ± 0.03^a	0.79 ± 0.01^a	0.77 ± 0.03^a	0.69 ± 0.05^b	0.59 ± 0.11^c	7.74	<0.01
H₂O₂ content (μmol/g FW)	4.77 ± 0.4^c	4.97 ± 0.6^c	5.33 ± 0.4^c	9.96 ± 0.3^b	16.50 ± 1.9^a	90.35	<0.01
POD activity (μmol/min/g FW)	0.23 ± 0.01^c	0.22 ± 0.04^c	0.26 ± 0.02^c	0.46 ± 0.06^b	0.58 ± 0.04^a	53.01	<0.01

Different lowercase letters indicate significantly different values analyzed with an ANOVA followed by a Tukey's test; P < 0.05.

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