Table 2.

Studies of circRNAs in plant stress responses.

	Plant Stress	Plant Species	Tissues	Number of Differentially Expressed circRNAs	Year	Reference
Biotic	Pseudomonas syringae pv. actinidiae infection	Kiwifruit	Root/Leaf	584	2017	Wang et al., 2017
	TYLCV infection	Tomato	Leaf	115	2018	Wang J. Y. et al., 2018
	MIMV-Infected	Maize	Leaf	160	2018	Ghorbani et al., 2018
	Verticillium wilt	Cotton	Root/Stem	280	2018	Xiang et al., 2018
Abiotic	Nutrient Depletion	Oryza sativa L., Arabidopsis thaliana	Root	27	2015	Ye et al., 2015
	Cold	Tomato	Fruit	163	2016	Zuo et al., 2016
	Dehydration	Wheat (Triticum aestivum L.)	Leaf	62	2017	Wang et al., 2016
	Low-nitrogen	Wheat (Triticum aestivum L.)	Root	6	2018	Ren et al., 2018
	Drought	Birch-leaf pear (Pyrus betulifolia Bunge)	Leaf	33	2018	Wang J. et al., 2018
	Chilling	Bell peppers (Capsicum annuum L. cv. Jingtian)	Fruit	36	2018	Zuo et al., 2018
	Heat	Cucumber (Cucumis sativus L.)	Leaf	6	2018	He et al., 2019
	Heat	Arabidopsis thaliana	Seedling	1583	2018	Pan et al., 2018
	Heat	Radish	Leaf	3	2019	Yang et al., 2019
	Copper	Citrus	Root/Leaf	45/17	2019	Fu et al., 2019
	Drought	Arabidopsis (Arabidopsis thaliana), maize (Zea mays)	Leaf	1843/1283	2019	Zhang P. et al., 2019
	Cold	Grape (Vitis vinifera)	Leaf	475	2019	Gao et al., 2019
	Salt	Cucumber (Cucumis sativus)	Root/Leaf	1934/44	2019	Zhu et al., 2019
	Calcium	Chinese cabbage (Brassica rapa L. ssp. pekinensis)	Leaf	616	2019	Wang W. H. et al., 2019
	Low-Phosphorus Stress	Soybean	Root	120	2020	Lv et al., 2020