摘要
以2年生小叶锦鸡儿幼苗为研究对象,采用盆栽控水法,设置适宜水分、轻度、中度和重度胁迫处理(即田间持水量的80%、60%、40%和20%),探讨小叶锦鸡儿幼苗在干旱胁迫历时15、30、45和60 d各器官非结构性碳水化合物(NSC)的响应规律。结果表明:不同干旱胁迫处理程度与时间对小叶锦鸡儿幼苗叶片、茎、粗根和细根可溶性糖、淀粉及总NSC含量均具有显著交互作用。轻度胁迫下,各器官可溶性糖、淀粉及总NSC含量在胁迫30 d时均显著低于适宜水分处理,细根可溶性糖和粗根淀粉含量在胁迫60 d时显著高于适宜水分处理。中度胁迫下,随着胁迫时间延长,茎和粗根可溶性糖含量先低于适宜水分处理,而后逐渐增加;与轻度胁迫处理相比,叶片、茎和细根可溶性糖含量增加,茎和粗根淀粉含量降低。重度胁迫下,各器官淀粉含量在胁迫15 d时显著低于适宜水分处理;在胁迫60d时显著高于适宜水分处理。以上结果说明,小叶锦鸡儿幼苗通过调整各器官NSC积累及分配应对不同干旱环境。
To understand the response of non-structural carbohydrates（NSC） to drought stress,two-year-old Caragana microphylla seedlings were planted in four different water treatments（suitable water level,mild,moderate and serious drought stress,i.e.,80%,60%,40% and 20% of field water-holding capacity） for 15,30,45 and 60 days.The results showed that there were significant interacting effect between drought stress degree and duration on the contents of soluble sugar,starch and total NSC of leaves,stems,coarse and fine roots of C.microphylla seedlings.Under mild drought stress,the soluble sugar,starch and total NSC contents in each organ were significantly lower than those under suitable water level on the 30th day of treatment.Moreover,the soluble sugar content in fine roots and starch content in coarse roots were significantly higher than those under suitable water level on the 60th day of treatment.Under moderate drought stress,the soluble sugar content in stems and coarse roots was firstly significantly lower than that under suitable water level,and then it gradually increased.Meanwhile,compared with mild drought stress,the soluble sugar content in leaves,stems and fine roots increased while the starch content in stems and coarse roots decreased under moderate drought stress.Under serious drought stress,the starch content in each organ was significantly lower than that under suitable water level on the 15th day of treatment,and it was significantly higher than that under suitable water level on the 60th day of treatment.These results indicated that C.microphylla seedlings adapted to different drought environments by adjusting accumulation and distribution of NSC contents in different organs.
出处
《生态学杂志》
CAS
CSCD
北大核心
2017年第11期3168-3175,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31400613)资助
关键词
科尔沁沙地
器官关联性
可溶性糖
淀粉
适应策略
Horqin Sandy Land
organ relevance
soluble sugar
starch
adaptive strategy
