生态学报2017，Vol.37Issue(6)：1881-1887,7.DOI:10.5846/stxb201511052251
不同生境盐地碱蓬对氮饥饿的响应
Effects of nitrogen starvation on Suaeda salsa from different habitats
摘要
Abstract
Suaeda salsa L.can grow in the intertidal zone,or on inland saline soils.After pretreatment with different concentrations of nitrogen (0.3 and 5 mmol/L NO3--N),seedlings of two S.salsa populations were watered with a nitrogenfree nutrient solution (nitrogen starvation) at 200 mmol/L NaCl.After one or two weeks,the chlorophyll content and NO3-,nitrate reductase (Nir) activity,photosynthetic oxygen evolution rate in leaves,and shoot and root dry weight were measured.With 0.3 or 5 mmol/L NO3--N pretreatment,the NO3-content in leaves from the intertidal population was higher than from the inland population throughout the whole study.Nitrogen starvation decreased the chlorophyll content,NR activity,and photosynthetic oxygen evolution rate in leaves from the inland population more severely than in the intertidal population leaves.This was especially apparent when seedlings were pretreated with 0.3 mmol/L NO3--N.As for S.salsa from inland saline soils,the root/shoot ratio decreased significantly after nitrogen starvation.However,nitrogen starvation had no adverse effects on this ratio for the intertidal population after the pretreatment.The results suggest that S.salsa from the intertidal zone has a higher capacity for NO3-storage and nitrogen assimilation under low nitrogen conditions.As a result,the intertidal population seedlings have a higher ability for NO3--N reutilization to maintain nitrogen metabolism and normal photosynthesis.This indicates that S.salsa from the intertidal zone can better adapt to low nitrogen habitats as compared to the inland population.These traits may affect the distribution of S.salsa in their natural saline environments.关键词
盐地碱蓬/氮饥饿/NO3-/硝酸还原酶/叶绿素Key words
Suaeda salsa/nitrogen starvation/NO3-/nitrate reductase/chlorophyll引用本文复制引用
刘冉冉,时伟伟,张晓东,宋杰..不同生境盐地碱蓬对氮饥饿的响应[J].生态学报,2017,37(6):1881-1887,7.基金项目
国家自然科学基金资助项目(31570392) （31570392）
山东省自然科学基金资助项目(ZR2010CM005) （ZR2010CM005）
