Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At4g11720	Required for male fertility.	Arabidopsis HAP2 (GCS1) is a sperm-specific gene required for pollen tube guidance and fertilization.; 2006; DOI: 10.1242/dev.02683; PMID: 17079265; https://pubmed.ncbi.nlm.nih.gov/17079265/ | HAP2(GCS1)-dependent gamete fusion requires a positively charged carboxy-terminal domain.; 2010; DOI: 10.1371/journal.pgen.1000882; PMID: 20333238; https://pubmed.ncbi.nlm.nih.gov/20333238/ | The functional domain of GCS1-based gamete fusion resides in the amino terminus in plant and parasite species.; 2010; DOI: 10.1371/journal.pone.0015957; PMID: 21209845; https://pubmed.ncbi.nlm.nih.gov/21209845/ | Egg cell-secreted EC1 triggers sperm cell activation during double fertilization.; 2012; DOI: 10.1126/science.1223944; PMID: 23180860; https://pubmed.ncbi.nlm.nih.gov/23180860/ |  Arabidopsis  HAP2/GCS1 is a gamete fusion protein homologous to somatic and viral fusogens.; 2017; DOI: 10.1083/jcb.201610093; PMID: 28137780; https://pubmed.ncbi.nlm.nih.gov/28137780/
Rice	Os05g0269500	Required for male fertility.	No verified direct reference in this release
Rice	Os09g0525700	Required for male fertility.	No verified direct reference in this release