以玉米杂交种种子为试验材料,研究胚乳无裂纹、胚乳单裂纹、胚乳双裂纹和胚乳龟裂文种子在萌发过程中超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)3种保护酶活性以及丙二醛(MDA)含量和细胞膜透性的变化规律。结果表明,随着种子萌发进程推进,其SOD、POD、CAT活性和细胞膜透性均呈逐步上升趋势,保护酶活性升高幅度表现为POD最大、CAT次之、SOD最小;不同胚乳裂纹类型种子在萌发过程中,其保护酶活性均表现为龟裂文种子<双裂纹种子<单裂纹种子<无裂纹种子。种子萌发过程中其MDA含量呈逐步下降的变化趋势,并表现为龟裂文种子中MDA含量最高,双裂纹的种子次之,无裂纹的种子最低。说明胚乳裂纹对种子萌发代谢具有不利影响,在种子生产中应该减少胚乳裂纹产生。 The seeds of maize hybrid seeds were used as experimental material to study the effects of no endosperm cracking, single endosperm endosperm, double endosperm cracking and seed germination on the seed germination of superoxide dismutase (SOD), peroxidase (POD), hydrogen peroxide (CAT) activity and the content of malondialdehyde (MDA) and cell membrane permeability. The results showed that with the progress of seed germination, the activities of SOD, POD, CAT and cell membrane permeability all showed a gradual upward trend. The increase of protective enzyme activity showed the highest POD, followed by CAT and the lowest SOD. In the germination process, its protective enzyme activity showed as cracked seeds