Development of a semi-open chamber system for the gas exchange measurement of whole-canopy under steady and unsteady states in cucumber seedlings

Table 1 Net photosynthesis rate (A, mmol m⁻² s⁻¹) measured at 10 (whole-canopy chambers A and B) and 11 (portable photosynthesis system) days after the emergence of cucumber seedlings (n = 3) using steady state methods (standard A-C_i response)

Reference CO₂ System type	0 (mmol CO₂ mol⁻¹)	200 (mmol CO₂ mol⁻¹)	400 (mmol CO₂ mol⁻¹)	600 (mmol CO₂ mol⁻¹)	800 (mmol CO₂ mol⁻¹)	1000 (mmol CO₂ mol⁻¹)
Portable leaf chamber system	− 2.8c^z	2.8a	7.3a	10.0a	11.5a	12.7a
Whole-canopy chamber A	− 2.4b	3.1a	7.6a	9.4b	10.8b	11.8b
Whole-canopy chamber B	− 2.1a	3.3a	7.2a	9.1b	10.7b	11.9b

^z Identical lower case letter indicates that means are not significantly different according to Tuckey’s HSD test (p > 0.05). Different lower case letters indicate that means are significantly different according to Tuckey's HSD test (p > 0.05)

ISSN: 1746-4811