TABLE 1.

Mechanism of bHLH on transcriptional regulation of target genes.

cis-acting element	Plant species	Nomenclature	Subfamily	Effect	Referenes
E-box, G-box	Arabidopsis thaliana L.	AtbHLH122	27	Participate in drought resistance, salt resistance, osmotic resistance	Liu et al., 2014
E-box, GCG-box	Arabidopsis thaliana L.	AtbHLH112	15	Participate in drought resistance, salt resistance	Liu et al., 2015
G-box	Arabidopsis thaliana L.	AtbHLH106	13	Participate in salt resistance	Ahmad et al., 2015
G-box	Arabidopsis thaliana L.	PIL5/AtbHLH15	24	Unknown	Kang et al., 2010
E-box, G-box	Arabidopsis thaliana L.	AtMYC2/AtbHLH006	2	Involved in niche regulation of root stem cells	Chen et al., 2011; Qi et al., 2015
E-box, G-box	Oryza sativa L.	OsbHLH096	26	Increase phosphorus hunger tolerance	Yi et al., 2005
N-box	Oryza sativa L.	DPF/OsbHLH025	7	Affect DP biosynthesis	Yamamura et al., 2015
E-box	Poncirus trifoliata	PtrbHLH	1	Scavenging oxygen free radicals, participate in low temperature resistance	Huang et al., 2013
E-box	Gossypium hirsutum Linn.	GhMYC4	2	Participate in drought resistance, salt resistance	Gao et al., 2016
E-box	Gossypium hirsutum Linn.	GhbHLH18	22	Regulate the content of coniferyl alcohol and sinapic alcohol	Gao et al., 2019
G-box	Catharanthus roseus (L.) G. Don	CrMYC2	2	Participates in the biosynthesis of terpenoid indole alkaloids	Zhang et al., 2011
G-box	Nicotiana tabacum L.	NtMYC2	2	Regulate nicotine biosynthesis	Shoji and Hashimoto, 2011
E-box, G-box	Nicotiana tabacum L.	NtbHLH123	15	Participate in cold resistance	Zhao et al., 2018
G-box	Betula platyphylla Suk.	BpbHLH7	12	Participates in the synthesis of triterpenoids	Wang et al., 2018
		BpbHLH8	25
E-box	Citrus sinensis (L.) Osbeck	CsbHLH18	13	Scavenging oxygen free radicals, participate in low temperature resistance	Geng and Liu, 2018
E-box, G-box	Malus × domestica Borkh.	MdCIbHLH1	Orphan	Participate in flower bud dormancy and dormancy removal	Ren et al., 2016
G-box	Malus × domestica Borkh.	MdMYC2	2	Participate in the Jasmonic acid (JA) signaling pathway	An et al., 2016
G-box	Medicago truncatula	MtbHLH148	19	Adjust the optical signal response	Wang et al., 2019
G-box	Tamarix hispida Willd.	ThbHLH1	26	Reduce the accumulation of reactive oxygen species (ROS)	Ji et al., 2016
G-box	Pisum sativum Linn.	PsGBF	1	Unknown	Qian et al., 2007