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Changes in Seed Germination Ability, Lipid Peroxidation and Antioxidant Enzyme Activities of Ginkgo biloba Seed during Desiccation

by Jing Feng 1,2, Yongbao Shen 2,3,4,*, Fenghou Shi 2,3,4 and Chengzhong Li 5
1
College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China
2
Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
3
Southern Tree Seed Inspection Center, National Forestry Administration, Nanjing 210037, China
4
College of Forestry, Nanjing Forestry University, Nanjing 210037, China
5
Department of Horticulture, Jiangsu Agri-animal Husbandry Vocational College, Taizhou 225300, China
*
Author to whom correspondence should be addressed.
Forests 2017, 8(8), 286; https://doi.org/10.3390/f8080286
Received: 13 June 2017 / Revised: 4 August 2017 / Accepted: 4 August 2017 / Published: 6 August 2017
With the aim of investigating the antioxidant system and germinability in response to the desiccation of Ginkgo biloba seeds, they were put in a drying room (25 ± 2% relative humidity, 25 °C) for 67 days. Results showed that the germination rate remained constant when seed moisture content (MC) decreased from 48% (fresh seeds) to 45.1%. However, when MC reached 40.1%, the germination percentage decreased from 92% to 50%. A significant positive correlation was observed between the MC and seed germination percentage (r = 0.910). The electrical conductivity was significantly increased during the initial desiccation (48–45.1%). Furthermore, both the superoxide dismutase (SOD) and peroxidase (POD) activity first reduced, then elevated to peak values before they declined again. POD activity rose earlier than SOD activity, indicating that the POD reaction was more desiccation-sensitive than the SOD. Significant negative correlations were observed between the MC and malondialdehyde (MDA) content (r = −0.619) and electrical conductivity (r = −0.745). Our collective results suggest that G. biloba seeds are highly sensitive to desiccation. Excessive desiccation could reduce the antioxidant enzyme activity of G. biloba seeds and intensify membrane lipid peroxidation, which causes the consequent reduction—or even the complete loss—of seed germinability. View Full-Text
Keywords: desiccation sensitivity; seed germination percentage; recalcitrant seed; lipid peroxidation desiccation sensitivity; seed germination percentage; recalcitrant seed; lipid peroxidation
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Feng, J.; Shen, Y.; Shi, F.; Li, C. Changes in Seed Germination Ability, Lipid Peroxidation and Antioxidant Enzyme Activities of Ginkgo biloba Seed during Desiccation. Forests 2017, 8, 286.

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