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园艺学报 ›› 2008, Vol. 35 ›› Issue (1): 7-12.

• 果树 • 上一篇    下一篇

低氧胁迫对平邑甜茶根系活力及氮代谢相关酶活性的影响

生利霞,束怀瑞*   

  1. 山东农业大学园艺科学与工程学院,作物生物学国家重点实验室,泰安 271018
  • 收稿日期:2007-07-23 修回日期:2007-10-11 出版日期:2008-01-25 发布日期:2008-01-25
  • 通讯作者: 束怀瑞

Effects of Hypoxia on the Root Activity, Respiratory Rate and the Activities of Enzymes Involved in Ntrigen Metabolism in Roots of Malus hupehensis Rehd.

SHENG Li-xia and SHU Huai-rui*   

  1. Institute of Horticultural Science and Engineering, State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong 271018, China
  • Received:2007-07-23 Revised:2007-10-11 Online:2008-01-25 Published:2008-01-25

摘要: 采用控制营养液溶氧浓度的方法,研究了低氧胁迫对平邑甜茶幼苗生物量、根系活力、根系呼吸速率以及氮代谢相关酶活性的影响。结果表明:低氧胁迫抑制了植株的生长,营养液溶氧浓度越低,抑制作用越明显;低氧处理前期根系呼吸速率也受到了明显地抑制,并且溶氧浓度越低抑制作用越强,但随处理时间的延长,抑制作用降低,而幼苗根系活力则先急剧升高后急剧下降;低氧胁迫诱导了硝酸还原酶(NR)和谷氨酰胺合酶(GS)的活性,溶氧浓度越低酶活性增加幅度越大;而对谷氨酸脱氢酶(NADH-GDH)的活性先抑制后促进。平邑甜茶可通过增加呼吸消耗、改变代谢途径来缓解低氧逆境伤害。

关键词: 平邑甜茶, 低氧胁迫, 根系活力, 氮代谢,

Abstract: The method of controlling dissolved oxygen concentration in nutrient solution was used. Effects of hypoxia on biomass of plant and root activity, respiratory rate, the activities of enzymes involved in nitrogen metabolism in the Malus hupehensis Rehd. seedling root system was studied. Results showed that the growth of seedling was inhibited and it was more serious as dissolved oxygen concentration of nutrient solution decreased under hypoxia; The respiratory rate of root system was more inhibited with decreasing dissolved oxygen concentration of nutrient solution first. But the inhibitory effect was decreased over the treatment time. The root activity was increased rapidly and then descended quickly; the activity of nitrate reductase (NR) and glutamine synthethase (GS) was improved under hypoxia. The activity of glutamate dehydrogenase (NADH-GDH) was inhibited first and then was promoted. The hypoxia was reduced probably by improving respiration consumption and changing the metabolic pathway.

Key words: Malus hupehensis Rehd., Hypoxia, Root activity, Enzymes, Nitrogen metabolism