Root plasticity and Pi recycling within plants contribute to low-P tolerance in Tibetan wild barley

BMC Plant Biology

Table 1 Biomass, P concentration and accumulation of barley L138 (low-P-tolerant) and L73 (low-P-sensitive) under low P and control conditions after 7 and 14 days

Treatment	Genotype	Biomass (g DW plant^− 1)			P concentration (mg P g^− 1 DW)		P accumulation (mg P organ^− 1)		Ratio of P in root to total (%)
Treatment	Genotype	Root	Shoot	R:S	Root	Shoot	Root	Shoot	Ratio of P in root to total (%)
7d
Control	L138	0.040 ± 0.001b	0.119 ± 0.006a	0.351 ± 0.028b	9.06 ± 0.14b	11.46 ± 0.18a	0.72 ± 0.04a	1.21 ± 0.10a	0.38 ± 0.03a
Control	L73	0.039 ± 0.003b	0.099 ± 0.005ab	0.397 ± 0.045ab	10.08 ± 0.21a	10.63 ± 0.52a	0.78 ± 0.12a	1.23 ± 0.17a	0.39 ± 0.01a
Low P	L138	0.053 ± 0.001a	0.113 ± 0.005a	0.466 ± 0.043ab	2.20 ± 0.05c	2.72 ± 0.27b	0.23 ± 0.00b	0.33 ± 0.01b	0.42 ± 0.01a
Low P	L73	0.046 ± 0.003ab	0.079 ± 0.006b	0.551 ± 0.041a	1.79 ± 0.01c	2.31 ± 0.20b	0.17 ± 0.01b	0.21 ± 0.03b	0.44 ± 0.05a
14d
Control	L138	0.063 ± 0.003c	0.258 ± 0.011a	0.251 ± 0.012b	9.39 ± 0.04b	10.78 ± 0.21a	1.19 ± 0.09b	3.01 ± 0.14a	0.28 ± 0.01c
Control	L73	0.071 ± 0.002c	0.245 ± 0.009ab	0.292 ± 0.021b	10.81 ± 0.18a	9.76 ± 0.14b	1.53 ± 0.06a	2.23 ± 0.19b	0.41 ± 0.03b
Low P	L138	0.124 ± 0.007a	0.223 ± 0.008b	0.568 ± 0.040a	1.50 ± 0.05c	1.31 ± 0.07c	0.39 ± 0.04c	0.28 ± 0.05c	0.59 ± 0.04a
Low P	L73	0.091 ± 0.002b	0.167 ± 0.004c	0.536 ± 0.018a	1.36 ± 0.03c	1.39 ± 0.01c	0.24 ± 0.01c	0.23 ± 0.00c	0.51 ± 0.01ab

Barley plants were grown in hydroponics under low P and control conditions for 7 and 14 days. Data are mean values ± SE (n = 3–6), different letters show significant differences (p ≤ 0.05). Bold numbers indicate significant differences between two lines under control or low-P conditions

ISSN: 1471-2229