Table 2.

Summary of the distributions of distances between nearest lateral organs within one rank in the roots of Arabidopsis 8 d after germination within zones one and two

Line or accession	Minimum distance (mm)	Maximum distance (mm)	Median distance (mm)	Average distance (mm)	No. of distances measured/no. of plants
J0121	0.20	4.4	2.00	2.07	105/75
C24	0.22	6.34	1.27	1.46	109/14
Col-0	0.30	7.54	1.44	1.87	112/19

Data for C24 and Col-0 were collected from cleared preparations of whole roots, whereas data for J0121 were collected on plasmolysed root portions 3–13 mm from the root tip or on the root portions formed between days 4 and 8 (see Materials and methods). As smaller root portions were analysed in J0121, existing maximum distances were underestimated. In addition, only those distances where pericycle cell number was possible to score between lateral organs were taken for analysis, so the number of J0121 plants analysed was much greater than for C24 or Col-0. This explains why the data for J0121 and C24 are slightly different.