Overexpression construct of NtSAT4 targeting the three compartments; Expression vectors of the NtSAT4 gene is put under the 35S promoter in each of (A) Cytosolic targeted pBin-AR-NtSAT4 13717 bp; (B) Plastid targeted pBin-AR-TKTP-NtSAT4 13959 bp; (C) Mitochondrial targeted pBin-AR-SHMT-NtSAT4 13818 bp.