河南农业科学 ›› 2023, Vol. 52 ›› Issue (6): 34-40.DOI: 10.15933/j.cnki.1004-3268.2023.06.004

• 作物栽培·遗传育种 • 上一篇    下一篇

茶多酚对铅胁迫下烟草生理指标及铅积累的影响

张留双1,谢徽1,2,杨金清1,韩佳祺1,保志娟1   

  1. (1.云南农业大学烟草学院,云南 昆明 650201;2.红云红河集团红河卷烟厂,云南 弥勒 652399)
  • 收稿日期:2022-10-08 出版日期:2023-06-15 发布日期:2023-07-10
  • 通讯作者: 保志娟(1978-),女,云南曲靖人,副教授,博士,主要从事烟草分析及烟草有害成分研究。E-mail:baozhijuan@aliyun.com
  • 作者简介:张留双(1998-),女,云南楚雄人,在读硕士研究生,研究方向:烟草品质分析。E-mail:2781978772@qq.com
  • 基金资助:
    国家自然科学基金项目(32160418);云南省科技计划农业联合面上项目(2017FG001-063)

Effects of Tea Polyphenols on Physiological Indexes and Pb Accumulation in Tobacco under Pb Stress

ZHANG Liushuang1,XIE Hui1,2,YANG Jinqing1,HAN Jiaqi1,BAO Zhijuan1   

  1. (1.College of Tobacco Science,Yunnan Agricultural University,Kunming 650201,China;2.Honghe Cigarette Factory,Hongyunhonghe Tobacco Group Company Limited,Mile 652399,China)
  • Received:2022-10-08 Published:2023-06-15 Online:2023-07-10

摘要: :为探讨外源茶多酚对烟草铅胁迫的影响,采用盆栽试验模拟土壤铅(Pb,750 mg/kg)污染,研究外施茶多酚(TP,0、300、600、900 mg/kg)对烤烟K326叶片抗氧化、氮代谢关键指标以及对烟株生物量、Pb积累的影响。结果表明,Pb胁迫下,烟株生物量受到显著抑制,烟叶超氧化物歧化酶(SOD)、过氧化物酶(POD)、亚硝酸还原酶(NiR)活性以及丙二醛(MDA)、活性氧(ROS)、过氧化氢(H2O2)、硝态氮(NO3--N)、可溶性蛋白含量升高,过氧化氢酶(CAT)和硝酸还原酶(NR)活性降低;添加茶多酚能提高烟株生物量和烟叶CAT活性,清除过多的ROS和H2O2,抑制MDA积累,同时激活NR,促进NO3--N转化,减少可溶性蛋白生成,降低NiR活性。Pb胁迫使烟株根、茎、叶中Pb含量分别增至CK(正常生长)的16.9倍、7.6倍、3.7倍;添加茶多酚后,各部位及全株Pb含量和积累量均较单一Pb胁迫处理降低,尤其是300 mg/kg茶多酚处理,根部Pb含量显著降低83.9%。整体上烤烟各部位对Pb的积累表现为根>叶>茎,但900 mg/kg茶多酚处理时Pb在烟株中的积累量则表现为根>茎>叶。综上表明,浇施茶多酚能缓解Pb胁迫下烟草的氧化损伤和氮代谢抑制,促进烟株干物质积累,减少烟株对Pb的吸收,从而减弱Pb对烟草的毒害。

关键词: 烟草, 茶多酚, 铅胁迫, 抗氧化, 氮代谢, 铅积累

Abstract: To explore the effects of exogenous tea polyphenols on Pb stress in tobacco,a pot experiment was conducted to simulate soil lead(Pb,750 mg/kg) pollution to study the effects of pouring tea polyphenols(TP,0,300,600,900 mg/kg)on the key indicators of antioxidation and nitrogen metabolism in flue⁃cured tobacco K326 leaves,and biomass and Pb accumulation in tobacco plants.The results showed that tobacco plant biomass was significantly inhibited under Pb stress,and the activities of superoxide dismutase(SOD),peroxidase(POD),nitrite reductase(NiR),and the content of malondialdehyde (MDA),reactive oxygen species(ROS),hydrogen peroxide(H2O2),nitrate nitrogen(NO3-⁃N)and soluble protein in tobacco leaves were increased,while the activities of catalase(CAT)and nitrate reductase(NR)were decreased;After adding tea polyphenols ,the biomass of tobacco plants and CAT activity of tobacco leaves were increased,excessive ROS and H2O2 were removed,MDA accumulation was inhibited,NR was activated,NO3-⁃N conversion was promoted,soluble protein production was reduced,and NiR activity was reduced.Pb stress increased Pb content in roots,stems and leaves of tobacco to 16.9,7.6 and 3.7 times of those in CK(normal growth group)respectively;After the addition of tea polyphenols,the content and accumulation of Pb in all parts and the whole plant were decreased compared with the single Pb stress treatment,especially the Pb content in roots under 300 mg/kg tea polyphenols treatment was significantly decreased by 83.9%.On the whole,the Pb accumulation in each part of flue⁃cured tobacco showed root>leaf>stem,but under 900 mg/kg tea polyphenols treatment,the accumulation of Pb in tobacco plant showed root>stem>leaf. In summary,pouring tea polyphenols can alleviate the oxidative damage and nitrogen metabolism inhibition of tobacco under Pb stress,promote the accumulation of dry matter in tobacco plants,reduce the absorption of Pb by tobacco plants,and thus weaken the toxicity of Pb to tobacco.

Key words: Tobacco, Tea polyphenols, Pb stress, Antioxidation, Nitrogen metabolism, Pb accumulation

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