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

doi:10.3724/SP.J.1143.2010.10039

Abstract

Abstract:

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

CLC Number:

Q 945

LU Xin-, LUO Yin-Ling-, WANG Yi-Fan-, LAN Qin-Ying. Effect of Different Drying Rates on the Desiccation Tolerance and Antioxidant Enzyme Activities of Baccaurea ramilfora (Euphorbiaceae) Seeds[J]. Plant Diversity, 2010, 32(4): 361-366.

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