[Effects of salt stress on the growth and the nitrate reductase activity in Thellungiella halophila].
The results showed that when Thellungiella halophila was treated with NaCl, the fresh and dry weight, the water content, the succulency of whole plant and the root/shoot ratio were decreased (Figs. 2-4, 7); the organic matter content in roots was increased and the inorganic matter content in roots was decreased, while those in shoots changed in the opposite direction (Fig. 6); osmotic adjustment ability, the Na+ content, the root activity were increased (Figs. 5, 7, 8); the nitrate reductase activity increased significantly; the O(-)(2*) content decreased at about NaCl 50 mmol/L but increased at about NaCl 100-400 mmol/L (Fig. 10). The micrographs of T. halophila leaf surface by scanning electron microscope (SEM) indicate that there is no salt gland or bladder on the surface of T. halophila (Fig. 1), so it is not a salt-secreting halophyte. The determination of growth parameters, the Na(+) content and Na(+) X-ray (Table 1) microanalysis of T. halophila indicate that T. halophila is not a salt-exclusing halophyte but it probability is a salt-dilution halophyte.
Liu
Ai-Rong
AR
Institute of Plant Stress, Shandong Normal University, Jinan 250014, China.
Zhao
Ke-Fu
KF
D019607:Brassicaceae / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D007287:Inorganic Chemicals / Q000378:metabolism; D050901:Nitrate Reductase / Q000378:metabolism*; D009930:Organic Chemicals / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology*; D014867:Water / Q000378:metabolism
D007287:Inorganic Chemicals; D009930:Organic Chemicals; D014867:Water; D012965:Sodium Chloride; D050901:Nitrate Reductase