(2) Dormancy and Germination of Seed dormancy of seed Mechanical reasons Physiological reasons ppv ec Germination of seed Physiological Status Environment factors Water, temperature, oxygen, light 2021/2/22 Chapter 162021/2/22 Chapter 16 10 （2）Dormancy and Germination of Seed • Dormancy of seed Mechanical reasons Physiological reasons • Germination of seed Physiological Status Environment factors Water, temperature, oxygen, light