Table 2.

Whole-plant C budget of E. americanum grown at three temperatures: 18/14 °C, 12/8 °C, and 8/6 °C

	Temperature
	18/14 °C	12/8 °C	8/6 °C
C fixed by the leaf (mg)	105	167	194
C respired by the leaf (mg)	40.5	48.4	50.2
C respired by the bulb (mg)	12.4	20.7	29.2
Net C incorporated (mg)	52.1	97.9	114.6
Starch accumulated (mg C)	50.1	107.5	116.3
C accumulation efficiency (%)	96	110	101

Total amount of C fixed in leaf and C respired in leaf and bulb during the entire epigeous growth period are indicated. Total net amount of C incorporated was estimated as [leaf C fixed–(leaf C respirated+Bulb C respirated)] and then compared with the amount of C accumulated in the bulb as starch at the end of leaf senescence. C accumulation efficiency was estimated as the ratio of C accumulated as starch/Net C incorporated.