Effect of exogenous IAA treatment on the main root length
To detect the effect of exogenous IAA treatment on the main root length, 15-day-old lines of OE, knockout, and NIP were treated with 1 μM IAA for 5 and 10 days. Seedlings cultured without exogenous IAA were used as controls. Three biological replicates were used for each group, and the culture solution was replaced every 3 days. Thereafter, the main root length was measured 5 and 10 days after treatment.