TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: In (M1), the S-nitroso thiol reductase activity is S-nitroso glutathione reductase activity.The nucleic acid encoding polypeptide having S-nitroso thiol reductase activity, is chosen from:(a) nucleic acid encoding a protein comprising a fully defined 379 amino acid (SEQ ID No. 2) sequence given in the specification;(b) nucleic acid encoding a protein having SEQ ID No. 2 in which one or more amino acids are substituted, deleted, inserted or added;(c) nucleic acid hybridisable with antisense strand of nucleic acid comprising a fully defined 1140 base pair (SEQ ID No. 1) sequence given in the specification, under stringent hybridization conditions;(d) nucleic acid encoding amino acid sequence being 85% or more identical to SEQ ID No. 2, where the sequence identity is aligned and calculated with BLAST algorithm on condition of Cost to open gap 11, Cost to extend gap 1, expect value 10 and word size 3; and(e) nucleic acid obtained by changing base sequence of nucleic acid comprising SEQ ID No. 1, due to nucleic acid polymorphism. EXAMPLE - Generation of plant having increased nitrogen dioxide reception ability, was carried out as follows. The plasmid such as pIG-GSNOR having fragment of S-nitroso glutathione reductase gene, cauliflower mosaic virus 35s promoter, T-nos, kanamycin resistant gene and hygromycin resistant gene, was introduced into Agrobacterium C58CI rifr (pM90), and the transformant was selected by cultivating in LB agar medium containing rifampicin (100 mg/l) and gentamycin (25 mg/l). The transformant was cultivated in LB liquid medium containing rifampicin (in micrograms/ml) (100), gentamycin (25) and kanamycin (50). The obtained microbial cells were suspended in MS culture medium containing myoinositol (in micrograms/ml) (50), thiamine hydrochloric acid (5), nicotinic acid (0.5), pyridoxine hydrochloric acid (0.5), 5 wt.% sucrose and 10 ng/ml of benzyl aminopurine. The Arabidopsis thaliana at the budding stage was infected with the prepared Agrobacterium solution for 10 minutes, and then the plant was grown at 22degreesC, in 8 hour dark period and 16 hour light period. The seed of the transformed plant was obtained and subsequently grown, and from the plant, the protein was extracted and S-nitroso glutathione reductase activity was analyzed. The results indicated that the S-nitroso glutathione reductase activity was enhanced about 800 times in the transformed plant, when compared to wild-type.