Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At3g17470	Possesses calcium-dependent ppGpp (guanosine 3'-diphosphate 5'-diphosphate) synthetase activity in vitro and is able to functionally complement E.coli relA mutants.	The bacterial stringent response, conserved in chloroplasts, controls plant fertilization.; 2008; DOI: 10.1093/pcp/pcm177; PMID: 18178586; https://pubmed.ncbi.nlm.nih.gov/18178586/ | Expression profiling of four RelA/SpoT-like proteins, homologues of bacterial stringent factors, in Arabidopsis thaliana.; 2008; DOI: 10.1007/s00425-008-0758-5; PMID: 18535838; https://pubmed.ncbi.nlm.nih.gov/18535838/
Rice	Os05g0161200	Possesses calcium-dependent ppGpp (guanosine 3'-diphosphate 5'-diphosphate) synthetase activity in vitro and is able to functionally complement E.coli relA mutants.	Calcium-activated (p)ppGpp synthetase in chloroplasts of land plants.; 2007; DOI: 10.1074/jbc.m703820200; PMID: 17938177; https://pubmed.ncbi.nlm.nih.gov/17938177/
Rice	Os05g0161800	Possesses calcium-dependent ppGpp (guanosine 3'-diphosphate 5'-diphosphate) synthetase activity in vitro and is able to functionally complement E.coli relA mutants.	Calcium-activated (p)ppGpp synthetase in chloroplasts of land plants.; 2007; DOI: 10.1074/jbc.m703820200; PMID: 17938177; https://pubmed.ncbi.nlm.nih.gov/17938177/
Rice	Os05g0161500	Possesses calcium-dependent ppGpp (guanosine 3'-diphosphate 5'-diphosphate) synthetase activity in vitro and is able to functionally complement E.coli relA mutants.	Calcium-activated (p)ppGpp synthetase in chloroplasts of land plants.; 2007; DOI: 10.1074/jbc.m703820200; PMID: 17938177; https://pubmed.ncbi.nlm.nih.gov/17938177/
Rice	Os09g0442600	Probable ppGpp (guanosine 3'-diphosphate 5'-diphosphate) synthetase that may be involved in a rapid plant ppGpp-mediated response to pathogens and other stresses.	No verified direct reference in this release