Table VI.

Photosynthetic rate and effect of photosynthetic photon flux density (PPFD) on the CO₂ compensation point (Γ) in leaves of D. tenuifolia, radish, and their hybrids

Values are given as the mean ± sd of four measurements. High and low PPFD are 1,000 and 300 μmol m^–2 s^–1, respectively.

Plant and Genotype	Photosynthetic Rate	Γ		Ratio of Γ at High/Low PPFD
		High PPFD	Low PPFD
	μmol m-2 s-1	μmol mol-1
D. tenuifolia (DtDt)	20.9 ± 2.8	19.8 ± 3.2	42.4 ± 6.5	0.47 ± 0.04
DtDtR hybrid	22.6 ± 2.6	28.5 ± 3.3	38.0 ± 4.6	0.76 ± 0.09
DtDtRR hybrid	18.8 ± 3.3	36.9 ± 3.9	39.6 ± 3.8	0.93 ± 0.07
DtRR hybrid	18.6 ± 2.6	50.2 ± 1.6	55.9 ± 1.4	0.90 ± 0.01
Radish (RR)	16.7 ± 1.5	49.7 ± 2.7	53.2 ± 2.6	0.93 ± 0.02