Table 1.

FT-IR spectra showing observed peaks and probable functional groups in salt treated roots.

Sr. no	Wave number (cm−1)				Probable functional group
	0 mM NaCl	150 mM NaCl		500 mM NaCl
Lipids (3000-2000 cm−1)
1	3787.51	3783.65			O—H stretch (Alcohols)
2		3699.76			O—H stretch(Alcohols), N—H stretch(Amines, Amides)
3	3300.57				N—H stretch (Amines)
4		3295.75			N—H stretch (Amides), O—H stretch(Alcohols), S, O—H stretch (Carboxylic acids)
5	2934.16	2942.84		2940.91	S, O—H stretch(Carboxylic acids), C—H stretch(Alkenes)
6		2894.63			S, O—H stretch(Carboxylic acids), C—H stretch (Alkanes), (CO)-H (Aldehydes)
7				2426.98	………………
8	2361.41	2361.41		2362.37	C C stretch(Alkynes)
9	2335.37	2334.41			C C (Alkynes)
10				2086.6	…………………
Proteins (1800- 1500 cm−1)
11	1727.91	1729.83			C O (Esters, Carboxylic acids, ketones, Aldehydes), C C (benzenes)
12	1637.27	1658.48		1646.91	C—O stretch (Amides), N—H bend(Nitro compounds, Amines), C O stretch (Carboxylic acids, ketones), C C (Alkenes, benzenes) (Proline)
13	1532.17	1529.27		1522.52	N-H bend (Nitro compounds), C—O stretch (Amides), C C (benzenes), C O (ketones)
Carbohydrates (1500-1200 cm−1)
14	1383.68		1380.78	1381.75	N O stretch (Nitro compounds), C—O stretch (Esters), CO—H bend (Aldehydes), O—H bend (Alcohols)
15	1320.04		1324.86	1326.79	S( O)2 stretch (Sulfones), N O stretch (Nitro compounds), O—H bend (Carboxylic acids, Alcohols)
16	1245.79		1245.79	1246.75	C—N stretch (Amines), C—O stretch (Esters, Ethers, alcohols), O—H band (Carboxylic acids)
Cell wall components (1000- 600 cm-1)
17	1059.69		1060.66	1060.66	S O stretch (Sulfoxides), C—N stretch (Amines), C—O stretch (Esters, Ethers, Alcohols), C—H bend (Benzene, Alkenes) (Cellulose)
18	897.701			897.701	C—N stretch (Amines), C—H bend (Benzene, Alkynes) (Xyloglucan)
19	766.566		778.136	776.208	C—N stretch (Amines), C—H bend (Benzene), C—C stretch
20	666.285				C—N stretch (Amines), C—H bend (Benzene), C—C stretch (Chlorides)