摘要
为了解三峡库区消落带适生木本植物适应周期性水淹的生理机制,以重庆市忠县汝溪河消落带植被修复示范基地内池杉为研究对象,分析了不同水淹强度下池杉的生长指标、非结构性碳水化合物(NSC)质量分数及代谢酶活性的变化特征.结果表明:1)三峡库区冬季水淹在一定程度上抑制了池杉的生长,但退水后,水淹组池杉各项生长指标及NSC代谢指标均能恢复到对照组植株相同水平. 2)冬季水淹期间,池杉将淀粉和果聚糖等NSC组分主要储存在根中,提高了对水淹的耐受能力;水淹显著抑制了池杉根系的淀粉质量分数以及茎的可溶性糖质量分数. 3)水淹显著降低了池杉中性转化酶、酸性转化酶、蔗糖合成酶以及淀粉酶的活性.池杉在冬季水淹期间采用“忍耐”的生存策略,将NSC更多地投入到生理代谢而非生长中,表现出对水淹良好的适应性.
In order to explore the physiological mechanism of suitable woody plants adapting to periodic submergence in the fluctuating zone of the Three Gorges Reservoir(TGR), the Taxodium ascendens in the vegetation restoration demonstration base of Ruxi River in Zhong County, Chongqing was used as research objects. The growth situation, the content of non-structural carbohydrates(NSC) and the metabolic enzyme activities of plants were measured in order to explore the physiological mechanism of T. ascendens adapting to the hydrological rhythm in the TGR. The results showed that: 1) The winter submergence in the water-fluctuation zone of the TGR significantly inhibited the growth of T. ascendens, but after water withdrawal, the growth and NSC metabolism ability of plants in the submergence group could be restored to the level of the control. 2) During winter submergence, NSC components such as starch and fructan were mainly stored in the roots, which improved the tolerance to submergence. The starch content in the roots and soluble sugar content in stems were significantly inhibited by winter submergence. 3) The activities of neutral invertase, acid invertase, sucrose synthase and amylase were significantly reduced during winter submergence period. T. ascendens devoted more NSC to physiological metabolism than growth during winter submergence and showed good adaptability to winter fluctuation in TGR.
作者
蒲博
李瑞
杨琴
李昌晓
魏虹
PU Bo;LI Rui;YANG Qin;LI Changxiao;WEI Hong(School of Life Sciences,Southwest University/Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region,Ministry of Education,Chongqing 400715,China)
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第7期24-34,共11页
Journal of Southwest University(Natural Science Edition)
基金
国家重点研发计划项目(2017YFC0505305)
中央林业改革发展资金科技推广示范项目(渝林科推2020-2)
重庆市科技兴林项目(2021-9)。
关键词
三峡库区
消落带
水淹
池杉
非结构性碳水化合物
Three Gorges Reservoir
riparian zone
submergence
Taxodium ascendens
non-structural carbohydrate metabolism
