Effects of short-term exposure to different salinity levels on Myriophyllum spicatum and Ceratophyllum demersum and suitability of biomarkers to evaluate macrophyte responses to salinity stress

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Table 1

Regression relationships between different parameters of Myriophyllum spicatum and Ceratophyllum demersum under salinity exposure.

Parameters	Equation	R²
H₂O₂ vs. Elongation
M. spicatum	Elongation = 0.1078 (H₂O₂²) − 2.7379 (H₂O₂) + 23.557	0.965
C. demersum	Elongation = 0.2127 (H₂O₂) + 4.4377	0.863
H₂O₂ vs. Photopigments
M. spicatum
	Chl a = 0.5943 (H₂O₂) + 5.194	0.168
	Chl b = 0.3778 (H₂O₂) + 1.747	0.227
	Car = 0.1248 (H₂O₂) + 1.262	0.209
C. demersum	Chl a = −4.169 (H₂O₂) + 44.343	0.942
	Chl b = −1.518 (H₂O₂) + 16.171	0.944
	Car = −0.892 (H₂O₂) + 9.939	0.858
Photopigments vs. Elongation
M. spicatum	Chl a = −3.4177 (Elongation) + 30.615	0.190
	Chl b = −9.0176 (Elongation) + 29.943	0.394
	Car = −11.503 (Elongation) + 26.81	0.077
C. demersum	Chl a = −0.1609 (Elongation²) + 2.5185 (Elongation) +10.628	0.944
	Chl b = −0.0542 (Elongation²) + 0.8421 (Elongation) +4.340	0.930
	Car = −0.0479 (Elongation²) + 0.8519 (Elongation) +1.348	0.968
Anthocyanin vs. Elongation
M. spicatum	Antho = −0.5321 (Elongation) + 20.707	0.807
C. demersum	Antho = 0.2324 (Elongation²) + 3.5127 (Elongation) + 32.494	0.701
GPX vs. Elongation
M. spicatum	GPX = −0.1352 (Elongation²) + 2.0481 (Elongation) + 26.426	0.482
C. demersum	GPX = −115.46 (Elongation) − 2095.5	0.824
CAT vs. Elongation
M. spicatum	CAT = −0.185 (Elongation) + 5.74	0.423
C. demersum	CAT = −0.1353 (Elongation²) + 3.0291 (Elongation) + 28.597	0.719
APX vs. Elongation
M. spicatum	APX = 0.1966 (Elongation) + 13.658	0.400
C. demersum	APX = 0.3927 (Elongation²) + 9.6447 (Elongation) + 78.637	0.485

Chl a, chlorophyll a content; Chl b, chlorophyll b content; Car, carotenoids content; Antho, anthocyanin content; GPX, guaiacol peroxidase activity; CAT, catalase activity; APX, ascorbate peroxidase.

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