海拔对藜麦苗期生理指标的影响

Effects of Altitude on Physiological Indexes of Chenopodium album at Seedlings Stage

选择甘肃省不同海拔地区,以国内首个藜麦品种陇藜1号为材料,测定不同海拔对藜麦苗期叶片生理指标的影响。结果表明,随海拔的升高,藜麦叶片的叶绿素、可溶性蛋白和脯氨酸含量先升高后下降;MDA含量和O_2^-产生速率升高后下降再升高,在海拔最高(2 130 m)处达到最大值;SOD、POD、CAT和APX活性先升高后下降。说明随海拔的升高,藜麦叶片通过积累渗透调节物质和提高抗氧化酶活性,以清除多余的活性氧物质,维持细胞渗透势平衡,缓解环境变化对其生长造成的伤害。

Longli 1,the first Chenopodium album cultivar in China, was selected as the experimental material to determine the effects of different altitudes on physiological indexes of the leaves at the seedling stage in different altitudes in Gansu Province.The results showed that chlorophyll, soluble protein and proline contents of the leaves increased first and then decreased with the elevation increasing,MDA content and O_2^- production rate increased,then decreased and increased again, reaching the maximum at the highest elevation（2 130 m）,and SOD,POD,CAT and APX activities increased first and then decreased. The results indicated that with the increase of altitude,the leaves accumulated osmotic regulators and increased antioxidant enzymes activities to remove excess reactive oxygen species,maintain the balance of cell osmotic potential, and alleviate the damage caused by environmental changes to its growth.