[Effects of salicylic acid on sucrose metabolism of tomato seedlings under NaCl stress].
A water culture experiment was conducted with the seedlings of tomato (Lycopersicon esculentum Mill.) cultivar Liaoyuanduoli to study the effects of salicylic acid (SA) on their sucrose metabolism under NaCl stress. The seedlings were treated with different concentrations (100, 300, and 500 mg x L(-1)) of SA, and the contents of sucrose, glucose, and fructose as well as the related enzyme activities of sucrose metabolism, including acid invertase (AI), neutral invertase (NI), sucrose phosphate synthase (SPS), and sucrose synthase (SS), in seedling leaves were determined. Under NaCl stress, SA could maintain or enhance the leaf fructose and glucose contents and the leaf AI, NI, SPS and SS activities, with the highest increment of fructose and glucose contents being 30.0% and 31.1% and that of AI, NI, SPS and SS activities being 24.7%, 27.9%, 22.0% and 24.5%, respectively, in comparing with no SA application, while had less effect on the leaf sucrose content, which suggested that SA could play a protective role in the NaCl-tolerance of tomato seedlings via enhancing the leaf invertase activity to increase leaf fructose and glucose contents. The best alleviating effect was observed at 500 mg x L(-1) of SA.
Su
Yue
Y
Liaoning Provincial Key Laboratory of Protected Horticulture, College of Horticulture, Shenyang Agricultural University, Shenyang 110161, China. suyue9@qq.com
Li
Tian-Lai
TL
Li
Nan
N
Yang
Feng-Jun
FJ
Lu
Shao-Wei
SW
D018551:Solanum lycopersicum / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D020156:Salicylic Acid / Q000494:pharmacology*; D036226:Seedlings / Q000378:metabolism*; D012965:Sodium Chloride / Q000633:toxicity*; D013312:Stress, Physiological / Q000187:drug effects; D013395:Sucrose / Q000378:metabolism*; D043324:beta-Fructofuranosidase / Q000378:metabolism
D012965:Sodium Chloride; D013395:Sucrose; D043324:beta-Fructofuranosidase; D020156:Salicylic Acid