低氮胁迫对杉木幼苗生长及生理的影响

Low Nitrogen Stress on Growth and Physiology of Cunninghamia lanceolata Seedlings

摘要: 氮是植物生长发育过程中必不可少的营养元素。以 FK，S39，S3和新 6四个杉木 Cunninghamia lanceolata无性系的萌芽条扦插苗为材料，采用营养液气雾栽培法，分析低氮（low nitrogen，LN）胁迫对杉木不同无性系幼苗生长和生理的影响。结果表明，LN抑制杉木幼苗生长，促进根系的生长，降低叶片长宽比，增加根冠比；LN胁迫使叶片中丙二醛的含量增加，叶绿素 a和叶绿素 b的含量降低，可溶性蛋白的含量增加，超氧化物歧化酶（SOD）和过氧化物歧化酶（POD）活性增加。

Abstract: In October of 2013, stem cuttings of four Cunninghamia lanceolata clones FK, S 39, S 3 and Xin 6 were harvested from Kaihua Forest Farm of Zhejiang province and were cultivated by aeroponic. Experiments were carried out on low nitrogen stress (LN) on growth and physiology of seedlings during the next May to September. The results showed that LN could inhibit the growth of seedlings, promote the growth of root system, decrease leaf length breadth ratio, and increase the root/shoot ratio. The content of MDA increased, chlorophyll a and b decreased in treated seedlings. The content of soluble protein, the activity of SOD and POD increased in seedlings treated by LN.