Table 1.

Effects of extrinsic factors in modulating root system architecture

Condition	Impact	Genes	Interactions	References
Root system submergence	CRP development	SUB1	GA, ethylene	Xu et al. (2006) and Fukao et al. (2011)
Drought	LR emergence	OsABA8ox2	ABA	Zhang et al. (2020b)
Low phosphate availability	Root foraging: increased LR initiation	OsPTF1, Pho2, mir 399	Auxin, CK, Ethylene, GA	Yi et al. (2005) and Bari et al. 2006
High Al3+	Inhibition of LR initiation	ART1	Auxin, ethylene	Yamaji et al. (2009)