木麻黄种子萌发对铬胁迫的生理生态响应研究

The physiological and ecological responses of the seed germination of Casuarina equisetifolia to chromic stress

试验研究不同浓度CrCl3 胁迫对木麻黄种子萌发初期一些生理生态特征的影响结果表明 ,随CrCl3 处理浓度的加大而木麻黄种子萌发率逐渐降低 ,幼苗株高、根长、鲜物质量和干物质量均逐渐降低 ;脯氨酸、超氧负离子含量先升后降 ,蛋白质含量逐渐升高 ;超氧化物歧化酶活性 (SOD)先升后降 ,过氧化物酶活性 (POD)和过氧化氢酶活性 (CAT)则逐渐增加 ,SOD、POD、CAT活性可作为毒物的敏感指示者。环境胁迫条件下植物体形态特征的响应常滞后于生理特征。

Effects of CrCl_3 stress with different concentrations on some earlier physiological and ecological characteristics of seed germination of Casuarina equisetifolia were studied. The results show that the seed germination percentage,the plant height, root length, fresh biomass, and dry biomass of seedlings all gradually decrease with the treatments of increased CrCl_3 concentrations. At the meantime, the contents of proline and superoxide anion (O A-·D_2) increase firstly and decrease afterwards, and the content of protein gradually increases. Furthermore, the activity of the protective enzyme SOD increases firstly and decreases afterwards, and the activities of POD and CAT both gradually increase. The activities of SOD,POD,CAT can act as sensitive designators to poison, and the morphologic responses of plant usually lag behind the physiological responses when it is under the environment stress.