Table 2.

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

Sr. No.	Wave number (cm−1)			Probable functional group
	0 mM NaCl	150 mM NaCl	500 mM NaCl
Lipids (3000-2000 cm−1)
1	3772.08	3852.11, 3782.69	3884.9, 3852.11, 3782.69	O—H stretch (Alcohols)
2	3285.14	3284.18	3279.36	N—H stretch (Amides, Amines), O—H stretch (Alcohols), S, O—H stretch (Carboxylic acids), C—H (Benzene, Alkynes, Alkenes)
3	2928.38	2930.31	2930.31	S, O—H stretch (Carboxylic acids), C—H stretch (Alkanes)
4	2426.98			P-H phosphine
5		2397.08, 2370.09	2361.41	P-H phosphine
6	2067.32	2066.35		-------
Proteins (1800-1500 cm−1)
7	1885.08	1885.08	1883.15	C O stretch (Ketone), C C (Benzene)
8			1728.87	C O (Saturated Aldehyde), C C stretch (Benzene)
9	1642.09	1645.95	1636.3	N—H bend (Nitro compounds, Amides), C—C stretch (Amides), C O stretch (Carboxylic acid, Ketone), C C (Benzene, Alkenes)
10	1538.92	1537.95	1539.88	N—H bend (Nitro compounds), C—O stretch (Amides, Ketone), C C (Benzene)
Carbohydrates (1500-1200 cm−1)
11	1383.68	1388.5	1385.6	N O stretch (Nitro compounds), CO—H bend (Aldehydes), O—H bend (Alcohols)
12	1321.96	1327.75	1327.75	S( O)2 stretch (Sulfones), N O stretch (Nitro compounds), O—H bend (Carboxylic acids, Alcohols)
13	1240	1242.9	1241.93	C—N stretch (Amines), C—O stretch (Esters), C—O stretch (Ethers, Alcohols), O—H band (Carboxylic acids)
Cell wall components and chlorophyll (1000- 600 cm−1)
14	1026.91	1063.55	1069.33	S O stretch (Sulfoxides), C—N stretch (Amines), C—O stretch (Esters, Ether, Alcohol), C—H bend (Alkenes) (Rhamnogalacturonan and Chlorophyll)
15	953.627	958.448		C—H bend (Alkenes) (Pectin)
16	830.205	828.277	830.205	C—N stretch (Amines), C—H bend (Benzene, Alkenes), C—C (Chlorides)
17	774.279	776.208	775.244	C—N stretch (Amines), C—H bend (Benzene), C—C stretch (Chlorides)
18		637.358	665.321	C—N stretch (Amines), C—H bend (Benzene), C—C stretch (Chlorides)