Table 1.

Examples of Engineered Sterility in Forest Trees.

Species	Sterility target	Strategy	Candidate gene(s)	Reference
Angiosperm trees
Betula pendula	Male	Cell ablation inflorescences	BpFULL1::barnase	Lännenpää et al., 2005
Eucalyptus occidentalis	Male	Cell ablation male flowers	PrMC2::barnaseH102E	Zhang et al., 2012
Populus tremula x tremuloides	Male	Cell ablation tapetum	TA29:: barnase	Elorriaga et al., 2014
Populus alba	Female	Suppression via RNAi	PtLFY	Klocko et al., 2016a
Populus alba	Female	Suppression via RNAi	PtAG	Lu and Strauss, 2018
Populus tremula x tremuloides	Male	Suppression via RNAi	LFY/AG	Klocko et al., 2018
Gymnosperm trees
Pinus rigida x. P. taeda	Male	Cell ablation male cones	PrMC2-barnaseH102E	Zhang et al., 2012