Table I.

Morphology of wild-type and mutant plants

Characteristica	Wild Typeb	rib1b	No. of Seedlingsc	t test P Valued
Root length (mm)	22.3 ± 0.6	18.7 ± 0.4	62–67	4.5 × 10−6 d
No. lateral roots	21.0 ± 1.1	34.1 ± 1.7	74–76	2.6 × 10−9 d
Plant height (cm)	23.3 ± 0.7	22.2 ± 0.7	18–19	0.31
No. lateral branches	3.8 ± 0.2	3.5 ± 0.2	18–19	0.22

^a Root lengths were measured on 7-d-old seedlings, the number of lateral roots was counted on 14-d-old seedlings, and plant height and the number of lateral branches were determined on adult plants. 

^b Values are averages (±se). 

^c Number of seedlings represented by the average. 

^d Marks a highly significant difference.