• 中文核心期刊
  • CSCD来源期刊
  • 中国科技核心期刊
  • CA、CABI、ZR收录期刊

镁缓解高温强光对烟草植株光合生理伤害的影响

Physiological Effect of Magnesium in Relieving Temperature-and-light-induced Damage to Tobacco Plants

    摘要
  • 摘要:
      目的  探究镁营养缓解高温强光对烟草光合生理伤害的影响机制，以期为福建地区烟草栽培提供理论指导。
      方法  以烟草翠碧一号为试验材料，设置4个镁质量浓度（0、12.0、48.0 和120.0 mg·L−1）与33 ℃高温下2个光强（600和1200 µmol·m−2·s−1）处理，分析不同施镁量对不同光强处理下烟株光合生理的影响。
      结果  强光（1 200 µmol·m−2·s−1 ）加重了烟株的缺镁症状，烟叶出现日灼斑，H2O2与丙二醛含量增加，膜透性升高。在48 mg·L−1时，烟株启动CAT、POD、SOD等抗氧化活性酶，清除多余的H2O2与丙二醛，增加叶片叶绿素合成量，提高净光合速率，避免烟株遭受高温强光逆境的伤害。
      结论  适当施镁能缓解高温强光胁迫下烟叶的日灼斑症状，提高烟株的干物质量和叶片叶绿素合成量，增加CAT、POD、SOD等抗氧化活性酶活性，从而有效缓解高温强光对烟株光合生理的伤害，其中在48.0 mg·L−1镁供应下缓解效果最好。

     

    Abstract:
      Objective   Application of magnesium to alleviate the physiological damage that seriously ill-affects the yield and quality of a tobacco plant by high temperature and strong light was studied.
      Method   Flue-cured tobacco, Cuibi No. 1 (Nicotiana tabacum), plants were supplied with magnesium at 0, 12.0, 48.0, and 120.0 mg·L−1 under 33 ℃ with light exposures of 600 or 1 200 µmol·m−2·s−1. Effects of the nutrient supplement on the physiology of tobacco plants were monitored.
      Result   A magnesium deficiency on the plants with the symptoms of sun-burn, H2O2 and malondialdehyde accumulations, and a heightened leaf membrane permeability was observed under the stress of 33 ℃ and the light exposure at 1 200 µmol·m−2·s−1. Through supplementing 48 mg·L−1 magnesium the tobacco plants significantly rose on the activities of superoxide dismutase and catalase, which eliminated ROS, as well as the chlorophyll content and net photosynthetic rate. The adverse effects caused by the stress were significantly relieved.
      Conclusion  Appropriate application of magnesium fertilization could alleviate the physiological damages on tobacco plants caused by high temperature and strong light exposure.

     

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