干旱胁迫下不同种源香椿苗可溶性糖的动态变化

以江苏南京、四川广元、湖南洞口、湖北随州、河南西峡、陕西安康6个种源香椿苗木为材料进行盆栽试验.研究干旱胁迫下香椿可溶性糖的动态变化.结果表明:干旱胁迫下6个种源香椿的可溶性糖含量均高于对照,同一种源不同时期香椿苗木可溶性糖的变化趋势基本一致,只是不同时期的变化幅度因种源不同而不同.在整个轻度胁迫过程中,叶片可溶性糖含量呈现"低-高-低"的变化趋势.重度胁迫下,可溶性糖含量变化趋势与轻度胁迫下一致,但含量高于轻度胁迫水平.同一时期不同种源香椿苗木可溶性糖含量变化幅度不同,湖南洞口种源增幅最小,恢复能力也最弱.

Dynamic Changes of Soluble Sugars in Seedlings of Different Toona sinensis Provenances under Drought Stress

The dynamic changes of soluble sugars under drought stress were studied in potted seedlings of six Toona sinensis provenances,which were from Nanjing of Jiangsu,Guangyuan of Sichuan,Dongkou of Hunan,Suizhou of Hubei,Xixia of Henan and Ankang of Shanxi.The results showed that the content of soluble sugars in seedlings of six Toona sinensis provenances under drought stress was higher than that of the control respectively.The tendencies of soluble sugars were similar in different phases for the same provenance.But the change extent was different with the provenances.The content of soluble sugars in leaves was fluctuated as low-high-low with the time both under light and heavy stress,but much higher under the heavy stress than under the light stress.In the same stress phase,the increment of soluble sugars varied with the provenances.The provenance Dongkou of Hunan had the least increment in soluble sugars and the least recovery ability after rewatering among six provenances.