Responses of woody plant root and xylem sap ATP to soil drying

作     者：Huafang Wang Jianhua Zhang Jiansheng Liang Weilun Yin 

作者机构：Beijing Forestry Univ Beijing 100083 Peoples R China Hong Kong Baptist Univ Hong Kong Peoples R China 

出 版 物：《Chinese Science Bulletin》 (科学通报(英文版))

年 卷 期：1999年第44卷第13期

页      面：1172-1178页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 

基　　金：National Natural Science Foundation of China NSFC: 394705751 

主　　题：Platycladus orientalis Acacia auriculiformis roots xylem sap ATP soil drought. 

摘      要：The ATP in roots and xylem sap of two woody plant species, Platycladus orientalis and Acacia auriculiformis, subjected to rapid and slow soil drying has been determined employing firefly luciferase ATP assay method (sensitivity is at 10-12 mol ATP L-1). The ATP levels in the two species were 1.6 nmol. gDW-1 and 0.6 nmol. gDW-1 in roots, and 5.6 μmol·m-3 and 8 μmol ·m-3 in xylem sap, respectively. When plants of P. orientalis and A. auriculiformis were subjected to rapid soil drying, respectively, as soil water content （SWC） decreased from the normal level ( 0.2.5 g·gDW-1) to 0.02 and 0.06 g·gDW-1, separately, plant water potential （ ψ ）dropped to - 4 and - 3.2 MPa, differently, the ATP in roots decreased 99.7% and 42%, respectively. When the rapidly dried soil was watered for up to 6 d, SWC and ψ, were found to recover to their normal levels, but ATP content in roots of P. orientalis and A. auriculiformis recovered by 10% and 23%, respectively. When plants