Plant Diversity ›› 2010, Vol. 32 ›› Issue (4): 361-366.DOI: 10.3724/SP.J.1143.2010.10039

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Effect of Different Drying Rates on the Desiccation Tolerance and Antioxidant Enzyme Activities of Baccaurea ramilfora (Euphorbiaceae) Seeds

 LU  Xin-1,2, LUO  Yin-Ling-1,3, WANG  Yi-Fan-1, LAN  Qin-Ying-1   

  1. 1 Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China; 2 School of Life Sciences, Yunnan University, Kunming 650091, China;  3 Life Science Department, Simao Teacher′s College, Puer 665000, China
  • Received:2010-02-24 Online:2010-08-25 Published:2010-04-19


 The effects of different drying rate on desiccation tolerance and ntioxidant enzyme activities of Baccaurea ramilfora seeds were studied in this paper. The initial water content(WC) of Bramilfora  seeds was high 172 g H2O·g1DW, and germination was 8667%, respectively. When the seeds dehydrated to the same water content (0.90g H2O·g1DW), the germination of seeds increased with slwodehydrated method ( 9778%), while decreased with rapiddehydrated method ( 6444%). The germination of rapiddehydrated seeds with 076 g H2O·g1DW WC was 2167%, while that of slowdehydrated seeds with 068 g H2O·g1DW WC was  5556%. The Bramilfora seeds were recalcitrant seeds which showed higher tolerance to slow dehydration. Both of relative electrolyte leakage and lipid peroxidation increased following hedehydration, and the increase rate of slowdehydrated seeds were slower than rapiddehydrated seeds. Among these antioxidant enzymes, the activities of SOD, DHAR and APX were higher in rapiddehydrated seeds than slowdehydrated seeds, while CAT was lower, and GR was not found. These results indicated that CAT played more important role in desiccation tolerance of Bramilfora seeds than the other antioxidant enzymes.

Key words: Baccaurea ramilfora, Drying rate, Antioxidant enzyme, Lipid peroxidation, Desiccation sensitivity

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