摘要
以1年生杨树幼苗为对象,采用盆栽控水法,设置适宜水分、轻度、中度和重度干旱胁迫处理,研究杨树幼苗叶、茎和根在处理15、30、45和60 d时非结构性碳水化合物(NSC)的变化。结果表明:与适宜水分处理相比,随着水分处理时间延长,水分胁迫导致杨树幼苗叶和茎的可溶性糖及NSC含量先增加后减少;根可溶性糖及NSC含量在轻度和中度胁迫处理呈下降趋势,在重度胁迫处理先增加后减少;叶淀粉含量在轻度胁迫处理先增加后降低,在中度和重度胁迫处理先减少后升高。水分处理45 d后,水分胁迫导致茎和根的淀粉及NSC含量显著下降。水分处理60 d时,NSC含量在各器官的下降率表现为根>茎>叶,淀粉含量下降率大于NSC含量。可溶性糖含量主要在叶中下降,在枝和根中保持稳定。水分胁迫导致杨树幼苗NSC储量降低,易遭受环境胁迫而导致死亡。
To understand the effects of water stress on non-structural carbohydrate( NSC) distribution in leaves,stems and roots of poplar seedlings,one-year-old poplar seedlings were grown under suitable water level,mild,moderate and serious drought treatments for 15,30,45 and 60 days in pots. The results showed that compared with the suitable water treatment,soluble sugar and NSC contents firstly increased and then decreased in leaves and stems with increasing treatment time under water stress treatments. Soluble sugar and NSC contents declined in roots under mild and moderate stress treatments,whereas they firstly elevated and then reduced under serious stress treatment. Starch content in leaves firstly increased and then declined under mild stress treatment,whereas it firstly decreased and then increased under moderate and serious stress treatments. Water stress significantly decreased starch and NSC contents in stems and roots after 45 days of water treatment. On the 60 th day of water treatment,the decline rate of NSC content in different organs followed the order: roots > stems > leaves. Meanwhile,the decline rate of starch content was greater than that of NSC content. Soluble sugar content declined in leaves,but being stable in stems and roots. These results indicated that water stress decreased NSC reserves of poplar seedlings,which may lead to death due to environmental stresses.
作者
王凯
林婷婷
吕林有
刘建华
黄舒漫
WANG Kai;LIN Ting-ting;LV Lin-you;LIU Jian-hua;HUANG Shu-man(College of Environmental Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Liaoning Institute of Sandy Land Management and Utilization,Fuxin 123000,Liaoning,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2019年第11期3283-3290,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31400613,31570709)
辽宁省教育厅服务地方项目(LJ2017FBL005)
辽宁省“兴辽英才计划”项目(XLYC1807017)资助
关键词
干旱
碳饥饿
可溶性糖
淀粉
适应策略
drought
carbon starvation
soluble sugar
starch
adaptive strategy
