Physiological Responses of Wild and Cultivated Barley to the Interactive Effect of Salinity and Iron Deficiency

Table 1

Interrelated photosynthetic parameters of total chlorophyll (TChl), stomatal conductance (𝑔_𝑠), transpiration rate (E), CO₂ assimilation rate (A), and relative intercellular CO₂ concentration (𝐶_𝑖/𝐶_𝑎, given as intercellular CO₂ concentration/ambient CO₂ concentration) in H. maritimum and H. vulgare plants hydroponically grown under iron supply (+Fe) or iron starvation (−Fe) at different salt levels (0, 100, 200 mM) over 60 h. Means of five replicates ± SE. For each line, means followed by the same letters are not significantly different according to Duncan’s test at 𝑃 ≤ 0.05.

		H. maritimum			H. vulgare
NaCl (mM)		0	100	200	0	100	200
TChl (mg/gFW)	+Fe	2.63±0.05^b	1.99±0.22^ab	1.74±0.50^a	2.69±0.18^a	2.32±0.31^a	2.30±0.19^a
	−Fe	0.79±0.51^a	0.88±0.41^a	1.00±0.71^a	0.26±0.04^a	0.29±0.10^b	0.29±0.06^b
𝐸 (mmol m^-2s^-1)	+Fe	2.76±2.10^a	2.77±0.13^a	2.32±0.38^a	4.16±0.60^c	3.31±0.50^b	1.91±0.20^a
	−Fe	4.12±1.36^b	3.06±0.42^ab	2.13±0.10^a	4.50±0.65^c	1.74±0.54^b	1.33±0.22^a
𝑔𝑠 (mol m^-2s^-1)	+Fe	0.74±0.36^b	0.48±0.05^ab	0.34±0.01^a	0.33±0.09^c	0.15±0.02^b	0.07±0.01^a
	−Fe	0.11±0.05^a	0.47±0.10^c	0.29±0.10^b	0.19±0.05^c	0.05±0.02^b	0.04±0.01^a
𝐴 (μmol m^-2s^-1)	+Fe	19.1±3.06^a	18.2±1.97^a	15.8±2.12^a	16.0±1.50^c	10.3±0.86^b	6.94±0.89^a
	−Fe	0.82±0.22^a	3.21±0.42^c	2.27±0.12^b	1.78±0.90^c	1.13±0.31^b	0.85±0.21^a
𝐶𝑖/𝐶𝑎	+Fe	0.75±0.03^a	0.73±0.03^a	0.69±0.04^a	0.68±0.03^c	0.58±0.03^b	0.46±0.03^a
	−Fe	0.90±0.02^ab	0.94±0.01^b	0.89±0.09^a	0.93±0.05^c	0.80±0.05^b	0.65±0.04^a