Photoprotection enhanced by red cell wall pigments in three East Antarctic mosses

Biological Research

Table 1 Relative absorbance FT-IR spectra for cell walls in red and green leaves of C. purpureus

‘Red’ cell wall peaks (cm⁻¹)	‘Green’ cell wall peaks (cm⁻¹)	Type of bond	Assignments to cell wall components (typical wavenumber signal in cm⁻¹)
885	880		–
900	910	β-anomeric C–O	Cellulose (900)
1033	1035	C–C stretch	Cellulose (1040)
1064	1060	C–O stretch	Cellulose (1060)
1155	1160	C–O stretch	Cellulose (1160)
1209	–	C–O stretch	–
–	1250	C–O stretch	Pectin (1243)
1323	1304	C–H₂ stretch	Cellulose (1320)
1375	1375	C–H₂ stretch	Cellulose (1367)
1420	1430	Benzyl C=C stretches	Phenol
1610	1630	C=C stretch	Non-esterified uronic acid (1600–1630)
~ 1640 (weak)	1645	C=O stretch	Phenolic ring (1630)
–	1723	C=O stretch	Phenolic ester (1720)

Known cell wall components have been assigned to peaks in FT-IR spectra (Additional file 1: Figure S3) according to data reported in Mouille et al. [33] and Alonso-Simón et al. [34]. Peak signals are in wavenumbers (cm⁻¹)

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