Chinese Bulletin of Botany ›› 2009, Vol. 44 ›› Issue (05): 587-593.DOI: 10.3969/j.issn.1674-3466.2009.05.009  cstr: 32102.14.j.issn.1674-3466.2009.05.009

• 研究报告 • Previous Articles     Next Articles

Effects of Photosynthetic Bacteria on Photosynthesis and Antioxidative Isoenzymes in Cucumber (Cucumis sativus)

Xingshun Song1, 2,Jing Ren3, Xuemei Liu1, 2, Shuang Ma1,Chuanping Yang2

  

  1. 1Department of Genetics, College of Life Science, Northeast Forestry University, Harbin 150040, China; 2Key Laboratory of Forest Tree Genetic Improvement and Biotechnology (Northeast Forestry University), Ministry of Education, Harbin 150040, China
  • Received:2008-12-18 Revised:2009-02-22 Online:2009-09-01 Published:2009-09-01
  • Contact: Chuanping Yang

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Abstract:

We examined the net photosynthetic rate (Pn), the maximal photochemical efficiency of PSII (Fv/Fm) and the activities of antioxidant isoenzymes in cucumber (Cucumis sativus) w ith or without photosynthetic bacteria (PSB) application. PSB spraying resulted in a significant increase in fresh weight and leaf area for both genotypes of cucumber plants, accompanied by a marked increase of Pn. However, Fv/Fm showed negligible changes. Exogenous PSB also increased activities of total superoxide dismutase (SOD) and ascorbate peroxidase (APX) , and a general increase of their isoenzymes. The increased level in Cu/Zn-SOD, Fe-SOD
and stroma APX (sAPX) was most significant in chloroplasts. These results implied that PSB played a favorable role in growth and photosynthesis and improved hardiness in cucumber by enhancing antioxidant enzyme activities.

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