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园艺学报 ›› 2004, Vol. 31 ›› Issue (3): 321-326.

• 研究论文 • 上一篇    下一篇

5-氨基乙酰丙酸对弱光下甜瓜幼苗光合作用和抗冷性的促进效应

汪良驹;姜卫兵;黄保健   

  1. (南京农业大学园艺学院,南京21009)
  • 收稿日期:2003-05-19 修回日期:2003-07-18 出版日期:2004-06-25 发布日期:2004-06-25
  • 通讯作者: 汪良驹

Promotion of Photosynthesis by 5-Aminolevulinic Acid (ALA)during and after Chilling Stress in Melon Seedlings Grown under Low Light Condition

Wang Liangju;Jiang Weibing,Huang Baojian   

  1. (College ofHorticulture,Nanjing Agricultural University,Nanjing 210095,China)
  • Received:2003-05-19 Revised:2003-07-18 Online:2004-06-25 Published:2004-06-25

摘要: 5-氨基乙酰丙酸(ALA)10 mg·L 处理能够明显提高弱光下生长的甜瓜幼苗叶片净光合速率(Pn),而低温胁迫明显降低甜瓜幼苗叶片光合能力。经ALA处理过的甜瓜幼苗光合表观量子效率、羧化效率、气孔开度、叶片叶绿素(特别是叶绿素b)和可溶性糖含量均显著增加。在ALA处理3 d之后将幼苗转移到8℃低温条件下4 h,对照叶片光合能力基本丧失,而ALA处理叶片仍能维持一定的光合能力,并在20 h内基本恢复至对照水平。若幼苗在低温下处理6 h,对照植株完全死亡,而ALA预处理植株仅出现少量伤害症状。本研究结果表明,ALA处理可以提高植物耐弱光性和抗冷性。

关键词: 5-氨基乙酰丙酸, 低温胁迫, 弱光胁迫, 甜瓜, 光合作用, 抗逆性

Abstract: Irrigation with exogenous 5-aminolevulinic acid (ALA) significantly promoted leaf net photosynthetic rate(Pn)of melon(Cucumis melo L.‘Ximiya 1’)seedlings grown under low light irradiation,as well as the plants treated by 8 ℃ chilling stress.The leaves of the plants treated with 10 mg·L-1 ALA solutions showed hi gher apparent quantum yield(AQY),carboxylation eficiency(CE),chlorophyll(especially chlorophyl b)content,dark respiration and bigger stomata aperture but lower respiration under light.Furthermore,after seedlings were transferred to 8℃ chilling for 4 hours and then recovered at 25-30℃ for 2 hours,the photosynthesis of the control leaves was only 12%-18% of that before chiling,while that in the ALA-pretreated leaf was 22%-38%.which would further recovered in 20 hours to 76%-101% of the control before chilling treatment.If the seedlings were chiled for 6 hours.the control plants all died while the ALA-pretreated ones only showed a few injury symptoms in the leaf margin.The analysis also showed that the soluble sugar content of leaves in ALA-retreated plants Was very significantly higher than that of control,which might be partly responsible for the higher chiling tolerance.The evidence presented here sugested that ALA treatment might promote low light tolerance and chilling tolerance of plants.

Key words: 5-Aminolevulinic acid( A), Chiling, Low light, Melon, Photosynthesis, Stress tolerance

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