Growth Responses and Nitrogen Uptake by Saltgrass (Distichlis spicata L.), a Halophytic Plant Species, under Salt Stress, Using the 15N Technique
Table 5
Total nitrogen and 15N contents (mg) of various clones of saltgrass shoot tissues under the control and salt (NaCl) stress conditions.
Grass clones ID
Shoot total N content
Shoot 15N content
Treatment
Treatment
Control, 0.95 dSm−1 (608 mg L−1)
EC 20 dSm−1 (12,800 mg L−1)
Control, 0.95 dSm−1 (608 mg L−1)
EC 20 dSm−1 (12,800 mg L−1)
(mg)
A138
31.58a
17.88cde
0.84a
0.48bcd
A136
26.36b
13.82efgh
0.76a
0.33fgh
240
22.26bc
18.02cde
0.57b
0.45cde
72
19.66cd
16.13def
0.55bc
0.36efg
A50
17.43cde
13.86efgh
0.45cde
0.35efg
A37
15.89def
9.49h
0.47bcd
0.25h
A126
15.57defg
12.47fgh
0.34fgh
0.24h
239
15.25defg
13.07fgh
0.36efg
0.25h
A60
14.54efgh
12.43fgh
0.40def
0.32fgh
A49
12.00fgh
11.96fgh
0.27gh
0.27gh
A107
10.88gh
9.95h
0.24h
0.21h
A86
10.23h
14.62efgh
0.27gh
0.34fgh
Values are total N and 15N contents of shoots, averages of 4 replications and 6 harvests for both experiments. Values for Total-N or 15N content for control and salt stress treatment columns compared together followed by the same letters are not statistically different at the 0.05 probability level.
