Table 4.

Impact of auxin-linked gene on stress response.

Crop	Gene	Physiological impact	Reference
Transgenic rice	Expression of auxin-coding genes OsIAA6	Tillering behavior	Jung et al., 2015
Transgenic poplar and potato	Overexpression of YUC6	Faster shoot growth and retarded main root development with enhanced root hair formation, reduced levels of ROS production, higher photosystem II efficiency, and less membrane permeability	Ke et al., 2015
Tomatoes	Auxin-responsive genes (WRKY108715, MYB14, DREB4, and bZIP 107)	Increased root density and growth, maintained chlorophyll content, and increased soluble sugar content	Bouzroud et al., 2018; Zhang et al., 2020
White clover	Up-regulated auxin responsive genes (GH3.1, GH3.9, IAA8), drought stress-responsive genes (bZIP11, DREB2, MYB14, MYB48, WRKY2, WRKY56, WRKY108715 and RD22), and down-regulated leaf senescence genes (SAG101 and SAG102)	Increased stem dry weight, chlorophyll content, delayed senescence	Zhang et al., 2020
Arabidopsis	Expression of auxin responsive IAA5/6/19	Maintained level of glucosinolates (GLS), regulation of stomatal closure and ROS production	Salehin et al., 2019
Wheat	TAA family gene TaTAR2.1-3A overexpression	Increased grain yield under various nitrogen supply levels, high lateral root branching	Shao et al., 2017
Sorghum	IAA-amido synthetase gene GH3.5	Stay green	Rama Reddy et al., 2014
Tobacco seedlings	Initial elevated DR5: GUS gene expression levels and later decreased expression levels	Lateral root branching	Wang et al., 2018a