Table 2.

Genes controlling important traits in citrus.

Serial No.	Gene details	Identified/cloned	Function study	Target trait	Reference
1	Papain-like cysteine protease	Sweet orange	–	Citrus Huanglongbing	Clark et al. (2018)
2	Accelerated cell death 2	Sweet orange	Duncan grapefruit		Pang et al. (2020)
3	2-oxoglutarate and Fe(II)-dependent oxygenase gene	US-897 (Citrus reticulata × Poncirus trifoliata)	–		Albrecht and Bowman (2011)
5	PtCDR2 and PtCDR8	P. trifoliata	–		Rawat et al. (2017)
6	AtNPR1	Arabidopsis	Duncan grapefruit and Hamlin sweet orange		Robertson et al. (2018)
7	CsLOB1	Sweet orange Duncan grapefruit	Editing of gene	Citrus canker	Hu et al. (2014) Jia et al. (2017)
8	CitRWP	Citrus	–	Polyembryony	Wang et al. (2017a)
9	CgMYB58	Pummelo	Expressed in citrus callus	Lignin biosynthesis	Shi et al. (2020)
10	S-RNase gene	Lemon	–	Self-incompatibility	Zhang et al. (2015)
11	Sm-RNase	Mandarin	–		Liang et al. (2020)
12	FT gene	Citrus	Grapefruit	Early flowering	Sinn et al. (2020)
13		P. trifoliata	Trifoliate orange and satsuma mandarin		Endo et al. (2005) Nishikawa et al. (2007)
14	CclSBP7	Clementine mandarin	Arabidopsis thaliana		Zeng et al. (2019)
15	miR3954	Citrus	Hong Kong kumquat (Fortunella hindsii)		Liu et al. (2017a)
16	CitdGlcTs	Citrus	Tobacco	Flavor	Chen et al. (2019)
17	Cit1,2RhaT	Citrus	Tobacco		Chen et al. (2019)
18	Cm1,2RhaT	Pummelo	Hong Kong kumquat (F. hindsii)		Chen et al. (2019)
19	CsVPP-1 and CsVPP-2	Sweet orange	–		Hussain et al. (2020)
20	CitAco3–CitIDH1–CitGS2	Sweet orange	–	Acidity	Chen et al. (2013)
21	CsAPD2	Sweet orange	–		Bai et al. (2020)
22	CsPH8	Sweet orange	Pummelo, tomato, and strawberry		Guo et al. (2016); Shi et al. (2019)
23	CitPH1 and CitPH5	Sour lemon, orange, pummelo and rangpur lime fruits	–		Strazzer et al. (2019)
24	CWINVs, VINV, SPS2, SUT2, VPP-1, and VPP-2	Sweet orange	–	Sugar	Hussain et al. (2020)
25	V-PPase1, 2	Sweet orange	–		Hussain et al. (2020)
26	CitPH1 and CitPH5	Sour lemon, orange, pummelo, and rangpur lime fruits	–	Anthocyanin and flavor	Strazzer et al. (2019)
27	CsCYP75B1	Sweet orange	A. thaliana	Flavonoid biosynthesis	Rao et al. (2020)
28	CsUDP78D3	Sweet orange	A. thaliana	Anthocyanin	Rao et al. (2019b)
29	CgRuby1, CgRuby2, AbRuby2	Atalantia and pummelo	A. thaliana		Huang et al. (2018)
30	Ruby and Noemi (bHLH)	Citrus	–		Catalano et al. (2020)
31	MYB3	Sweet orange	Arabidopsis		Huang et al. (2020)
32	CDG1	Pummelo	Arabidopsis and tobacco	Delayed leaf greening	Yu et al. (2020)
33	CCD4	Mandarins and its hybrids	–	Carotenoids	Zheng et al. (2019)
34	CsDxs and CsPsy	Sweet orange	–		Fanciullino et al. (2008)
35	CitDXS1 and three CitPSY1	Citrus	–		Peng et al. (2013)
36	CsMADS5 and CsMADS6	Sweet orange	–		Lu et al. (2018)
37	PSY2, LYCB2, LYCE, and CCD4	Pummelo	–		Jiang et al. (2019)