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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (8): 119-125.doi: 10.11707/j.1001-7488.20140817

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Effects of Protein Toxin from Arthrinium phaeospermum on Biophysical Characteristic and Respiration of Bambusa pervariabilis× Dendrocalamopsis grandis Mitochondria

Li Shujiang, Qiao Tianmin, Han Shan, Zhu Tianhui, Che Guannan   

  1. College of Forestry, Sichuan Agricultural University Ya'an 625014
  • Received:2013-06-07 Revised:2013-11-19 Online:2014-08-25 Published:2014-07-31
  • Contact: 朱天辉

Abstract:

Effects of the protein toxin from Arthrinium phaeospermum on the membrane fluidity, surface electronic potential, swelling, aggregation and the contents of lipid peroxide MDA, Coenzyme Q 10 (CoQ10), and respiration function of the mitochondria from shoots of different Bambusa pervariabilis×Dendrocalamopsis grandisvarieties were determined by the different detection techniques (fluorescence polarization, neutral red dye, oxygen electrode, etc.). The results showed that the protein toxin caused the membrane fluidity weakening, surface electronic potential and aggregation decrease, swelling increase of mitochondria in four bamboo varieties. With the protein toxin treatment, the CoQ10 content decreased, the MDA content increase, the activities of cytochrome c oxidase (CCO) and ATP decrease, respiratory control ratio (RCR) and oxidative phosphorylation ratio (P/O) significantly reduced. The above results demonstrated that the protein toxin damaged the mitochondrial membrane, increased the lipid peroxidation of mitochondrion, destroyed the membrane integrality, and inhibited the respiration. In term of all of the above indices, the effect of protein toxin on the resistant varieties (3# and 6#) was significantly weaker than that on the susceptible varieties (8# and 30#).

Key words: protein toxin, mitochondrion, biophysical characteristic, respiration

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