Table 1.

Environmental factors and molecular mechanisms affecting plant regeneration in tissue culture.

	Classifications	Specific contents
Environmental factors	Explant sources	Genotype (13, 41, 44–47); Age (50, 52, 55, 58, 60)
	PGRs	Auxin (56, 57, 76-79); CK (4, 80); ABA (81); GA (82)
	Basal culture medium	MS (83); N6 (8); B5 (83); WPM (84); carbon source (86–88)
	Light/Dark treatment	Photoperiod (91–93); light intensity (94); light type (95, 96)
Molecular mechanisms	Transcription factors	SERK1/2(116–121); WIND1 (113, 165); WUS (151, 152, 166–168); WOX5 (143); WOX11/12(145, 146); LEC1/2(100–106); BBM (102, 107); ABI3 (97–102); FUS3 (97–103); AGL15 (103, 104); CLV3 (153, 166-168); STM (154, 166–168); CUC1/2(141, 162); PLT 1/2(31); PLT3/5/7(148); EIN3 (147); LBD16 (148)
	DNA methylation	MET1 (131); CMT3 (132,155); DRM1/2(132, 155)
	Histone modifications	PRC1/2(14, 102, 133–135); PKL (136, 137); HADCs (138); HATs (138, 157); HAC1 (157)
	Auxin Signalling	IAA30 (103, 104); YUCS (19, 105, 106, 158); TAA1 (19, 105, 106); PIN (126); ARF (127, 128); AUX (126)
	Cytokinin Signalling	Type-A ARRs (113, 115, 155); Type-B ARRs (113, 115, 151)
	Other factors	miR160 (129); miR165/166(130, 160); miR156 (159)