Research Article

Growth Responses and Nitrogen Uptake by Saltgrass (Distichlis spicata L.), a Halophytic Plant Species, under Salt Stress, Using the 15N Technique

Table 4

Total nitrogen concentration (mg g−1) and atom percent 15N of various clones of saltgrass shoot tissues under the control and salt (NaCl) stress conditions.

Grass clones IDShoot total-N concentrationShoot atom percent 15N
TreatmentTreatment
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 g−1)(%)

24037.72a38.34a2.58ab2.52ab
23933.88ab33.50ab2.33bc1.91c
A3733.80ab27.90c2.94a2.61ab
A8633.00ab31.10bc2.65ab2.33bc
A13832.90b30.30bc2.65ab2.68ab
A13631.76bc29.40bc2.90a2.40b
A6031.60bc29.60bc2.77a2.55ab
A5031.13bc31.50bc2.60ab2.54ab
A4930.74bc29.16bc2.27bc2.25bc
A12628.30c27.70c2.21c1.95c
A10727.90c27.65c2.16c2.12c
7227.30c31.62bc2.78a2.24bc

Values are total N concentrations and atom % 15N of the shoots, averages of 4 replications and 6 harvests for both experiments.
Values for Total-N concentration or % 15N for control and salt stress treatment columns compared together followed by the same letters are not statistically different at the 0.05 probability level.