Figure 9.

A model of transcription regulation involved in response to potassium (K⁺) deficiency and feedback regulation of K⁺ uptake and root growth in cotton. Genes within the light grey box show the same responses to low K⁺ stress in CCRI41 (a K⁺ inefficient cotton variety) self-grafts (CCRI41/CCRI41, scion/rootstock) and its reciprocal grafts (SCRC22/CCRI41) with SCRC22 (a K⁺ efficient variety); while genes within the white box represent the components involved in feedback regulation of K⁺ uptake and root growth under K⁺ deficiency, they were specifically identified in the roots of SCRC22/CCRI41 or oppositely regulated by low K⁺ in CCRI41/CCRI41 and SCRC22/CCRI41. The red and blue highlighted genes were up- and down-regulated by low K⁺ respectively.