Table I. Broad-sense heritability and number of QTLs found.

The heritability was calculated using an ANOVA after least square means transformation.

Trait	Day 4	Day 6	Day 8	No. of QTLs
Median no. of roots	18.85	13.47	22.16	2
Volume	34.13	31.51	16.67	2
Bushiness	8.11	6.8	15.66	3
Maximum width	30.53	34.14	36.65	3
Length distribution	13	13.46	26.86	3
Ellipses axes aspect ratio	19.7	29.89	48.78	3
Specific root length	32.31	33.63	36.93	3
Perimeter	31.12	33.27	44.13	4
Surface area	30.54	31.25	31.77	5
Network area	30.94	32.38	34.8	6
Total length	29.45	32.82	43.1	6
Width-depth ratio	21.79	28.8	40.49	6
Maximum no. of roots	17.6	30.21	40.84	6
Average root width	27.59	38.69	49.84	7
Solidity	30.62	43.1	43.21	7
Minor ellipse axes	32.22	44.27	54.99	8
Depth	29.55	42.22	49.85	8
Network convex area	31.81	42.64	49.79	9
Major ellipse axes	29.86	41.57	43.75	12