Table II.

Relationship of seed density, pea border cell number, and CO₂:O₂ concentration

No. of Seeds per Plate	Border Cells/Root	CO2	O2
		%
10	4,180 ± 105b	0.3 ± 0.04b	19 ± 0.61a
30	6,510 ± 164a	1.6 ± 0.12a	17 ± 0.42ab

Pea seeds were germinated on water agar plates with different seed densities. Three days later, 1-mL air samples were collected from each plate and analyzed with a gas chromatograph. Border cell numbers were the average from five seedlings from each plates and there were three replicates (plates) for each treatment. The whole test was carried out twice. Values for gas contents and border cell numbers are mean of six replicates ± se.