Table 3. Comparison of Primary Root Length between the Wild Type, RR2 Overexpressing (OxRR2), and RNAi Transgenic Lines (RiRR2) 10 d after Germination.

Genotype (Plant Number)	Primary Root Length (cm)
Wild type (20)	6.01 ± 0.55
OxRR2-15 (16)	6.48 ± 0.71
OxRR2-1 (16)	4.66 ± 0.55**
OxRR2-14 (15)	4.59 ± 0.78**
OxRR2-27 (15)	4.36 ± 0.64**
OxRR2-31 (17)	4.82 ± 0.81**
RiRR2-13 (15)	3.48 ± 0.59**
RiRR2-24 (14)	3.94 ± 0.63**
RiRR2-26 (15)	3.41 ± 0.67**

Significant differences are indicated at the 5% (*) and 1% (**) probability levels (two-tailed t test). OxRR2-15 is a negative control.