Table 4.

Main metabolic compounds with mass numbers, their abundance relative to the total metabolites ingreen and red snow, and candidate metabolites and pathways corresponding to the mass numbers.

Mass number (m/z)	Green snow [%]	Red snow [%]	Candidate metabolite	Pathway
114	0.63	0.60	Fumarate	Purine metabolism
135	1.94	0.09	Adenine	Purine metabolism
139	0.01	0	Carbamyl-phosphate	Pyrimidine metabolism
155	0.06	0.03	Orotate	Pyrimidine metabolism
157	0.07	0.01	Dihydro-l-orotate or (S)-dihyrdoorotate	Pyrimidine metabolism
159	0.01	<0.01	Indole-acetaldehyde	Tryptophan metabolism
174	9.18	0.78	Indole-3-acetate (IAA; auxin)	Tryptophan metabolism
175	0.21	0.02	diphosphate	Tryptophan and pyrimidine metabolism
180	0	0.01	Keto-D-fructose or β-D-fructofuranose	Mannitol cycle
182	0.13	0.03	D-sorbitol or D-mannitol	Sorbitol biosynthesis or mannitol cycle
202	3.53	1.81	Indole-3-pyruvate	Tryptophan metabolism
204	0.16	0.46	Tryptophan	Tryptophan metabolism
246	0.67	0.93	(RS)-phospho-3-sulfolactate	Coenzyme M biosynthesis I
258	0.10	0.04	β-D-glucose 6-phosphate or β-D-fructofuranose 6-phsosphate	Various
260	0.32	0.78	D-mannitol 1-phosphate	Mannitol cycle
267	3.84	0.32	Adenosine	Purine metabolism
276	5.70	0.93	5-amino-6-(D-ribitylamino)uracil	Various
322	0	<0.01	Uridine-5′-monophosphate	Pyrimidine metabolism
336	0	0.01	Fructose 1,6-bisphosphate	Various
361	0	0.49	Guanosine 5′-phosphate	Purine metabolism
364	23.57	61.25	5-formamido-1-(5-phospho-D-ribosyl)-imidazole-4-carboxamide	Purine metabolism
365	1.34	3.59	Orotidine 5′-phosphate (orotidylic acid)	Pyrimidine metabolism
380	4.52	12.87	Sphinganine 1-phosphate	Sphingolipid metabolism
385	0	<0.01	5-phospho-α-D-ribose 1-diphosphate	Pyrimidine and purine metabolism,
440	0.01	0.02	Guanosine-diphosphate	Purine metabolism
Not identified	43.94	14.94

Underlined candidate metabolites have previously been identified in Chlamydomonas reinhardtii.