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《Acta Agrestia Sinica》 2011-01
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Effects of NaCl Stress on Proline Accumulation and Metabolic Pathways of Chicory(Cichorium intybus L.) Seedlings

WANG Kang1,2,LIU Yan-xiang1,DONG Jie3,ZHOU He2,DONG Kuan-hu1(1.College of Animal Science and Technology,Shanxi Agricultural University,Taigu,Shanxi Province 030801,China;2.Institute of Grassland Science, China Agriculture University,Beijing 100193,China;3.Institute of animal science,CAAS,Beijing 100193,China)  
Proline plays important roles in regulation of osmotic homeostasis,prevention of damages caused by osmotic stresses,scavenging of reactive oxygen species and protection of cell structures.Many plants accumulate proline dramatically under a variety of stress conditions.The regulation of proline accumulation in Chicory seedlings and the activities of key enzymes involved in proline metabolism in response to salinity were studied here.Fifty-day-old seedlings were treated with NaCl(0,100,200,300 and 400 mM) in this experiment.Results show that Ornithine-oxo-acid transaminase(δ-OAT) activity increases;Pyrroline-5-carboxylate synthetase(P5CS) activity initially increases then deccreases,while ProDH activity decreases with increasing NaCl concentration.Proline contents increase significantly(P0.05) with increasing salt-stress followed by a declining response during the extending salt-stress period.The data demonstrate that glutamate and ornthine pathways are activated by NaCl.The glutamate pathway is predominant under low-concentration NaCl treatments,and an ornithine pathway is predominant under high-concentration NaCl treatments.
【Fund】: “十一五”国家科技支撑计划课题“退化草地植被恢复与重建关键技术研究”(2007BAD56B01)资助
【CateGory Index】: S54
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