水分胁迫对枫杨幼苗生长及根系草酸与酒石酸含量的影响  

Effects of Water Stresses on Growth and Contents of Oxalate and Tartarate in the Roots of Chinese Wingnut (Pterocarya stenoptera) Seedlings

作　　者：李昌晓[1] 魏虹[1] 吕茜[1] 张晔[1] 

机构地区：[1]西南大学生命科学学院三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《林业科学》2010年第11期81-88,共8页Scientia Silvae Sinicae

基　　金：重庆市自然科学基金项目(CSTC-2008BA7032;CSTC-2010BB7003);国家林业公益性行业科研专项(201004039);中央高校基本科研业务费专项资金重点项目(XDJK2009B032);国家林业局948项目(2008-4-45);西南大学博士基金项目(SWU109020)

摘　　要：模拟三峡库区消落带土壤水分变化特征,设置常规生长水分条件(C组)、轻度干旱水分胁迫(MD组)、土壤潮湿(WS组)以及水淹(BS组)4个不同处理组,研究枫杨当年实生幼苗对多种水分胁迫的生理生化响应。结果表明:不同水分处理、时间以及水分与时间的交互作用对枫杨幼苗的生长、生物量、根系的草酸与酒石酸含量均产生极显著的影响(P<0.001或0.01)。与C相比,MD,WS和BS均显著降低枫杨幼苗的高生长与生物量积累,却能显著增加枫杨幼苗主根、侧根以及总根的草酸含量。BS也能显著增加枫杨幼苗主根、侧根以及总根的酒石酸含量。WS仅显著增加侧根酒石酸的含量,与MD显著降低侧根的酒石酸含量形成鲜明对照。随着处理时间的延长,枫杨幼苗根系的草酸与酒石酸含量表现出降低的趋势。由结果可知:虽然水淹、干旱的环境条件将会对当年生枫杨幼苗产生一定影响,但这些枫杨幼苗均能较好地存活下来。Chinese Wingnut（Pterocarya stenoptera）is one of the typical native species in the riparian zone of the Three Gorges Reservoir region.Its habitat has apparently been influenced by the abnormal water fluctuations annually.Four different kinds of water treatment simulating the dynamic change of soil water gradients in the riparian zone were applied to study the physiological and biochemical responses of Chinese Wingnut seedlings.The water treatments were normal growth water treatment（C）,mild drought water stress（MD）,wet soil（WS）and belowground submergence（BS）.The results showed that water treatment,time,and the interaction of water treatment and time,had significant impact on growth,biomass,and contents of oxalate and tartarate in the roots（P 0.001 or 0.01）.Compared to C,height growth and biomass accumulation in MD,WS and BS were significantly decreased.However,content of oxalate in taproot,lateral roots,and total roots was significantly increased in MD,WS and BS,respectively.Likewise,content of tartarate in taproot,lateral roots,and total roots was also significantly increased in BS.Furthermore,the content of tartarate in lateral roots enhanced significantly in WS in contrast to a significant reduction of that in MD.As treatment continued to progress,contents of oxalate and tartarate in the roots displayed a decline trend.According to our results studied,although the Chinese Wingnut seedlings less than one-year-old are to some extent susceptible to submergence,wet,and /or drought,all of the seedlings could survive relatively well.

关 键 词：三峡库区 消落带 水分胁迫 枫杨幼苗 草酸 酒石酸 生理生化 

分 类 号：S718.5[农业科学—林学]