Aldehyde Oxidoreductases/metabolism; Aminolevulinic Acid/metabolism; Arabidopsis Proteins/metabolism; Arabidopsis/metabolism; Chloroplasts/metabolism; Agrobacterium tumefaciens/genetics; Agrobacterium tumefaciens/metabolism; Aldehyde Oxidoreductases/genetics; Amino Acid Sequence; Arabidopsis/genetics; Arabidopsis Proteins/genetics; Carrier Proteins/genetics; Carrier Proteins/metabolism; Chlorophyll/biosynthesis; Chlorophyll/genetics; Chloroplasts/ultrastructure; Escherichia coli/genetics; Escherichia coli/metabolism; Gene Expression Regulation, Plant; Genes, Plant; Heme/genetics; Heme/metabolism; Molecular Sequence Data; Plants, Genetically Modified/genetics; Plants, Genetically Modified/metabolism; Plasmids/genetics; Plasmids/metabolism; Protein Interaction Mapping; RNA Interference; RNA, Plant/genetics; RNA, Plant/metabolism; Recombinant Proteins/genetics; Recombinant Proteins/metabolism; Thylakoid Membrane Proteins/genetics; Thylakoid Membrane Proteins/metabolism; Nicotiana/genetics; Nicotiana/metabolism; Transcription, Genetic; Two-Hybrid System Techniques