Responses of woody plant root and xylem sap ATP to soil drying
Responses of woody plant root and xylem sap ATP to soil drying
复制标题
木本植物根系和木质部汁液ATP对土壤干燥的响应
DOI：
10.1007/bf02885959
复制
发表时间：
1999-07
影响因子：
--
通讯作者：
Yin Weilun
中科院分区：
文献类型：
--
作者：
Wang Huafang;Zhang Jianhua;Liang Jiansheng;Yin Weilun
采用萤火虫荧光素酶 ATP 测定方法（灵敏度为 10-12 mol ATP L-1）测定了两种木本植物（侧柏和金合欢）经过快速和慢速土壤干燥后根部和木质部汁液中的 ATP。两个物种根部ATP水平分别为1.6 nmol·gDW-1和0.6 nmol·gDW-1，木质部汁液中ATP水平分别为5.6 μmol·m-3和8 μmol·m-3。当P植物。侧柏和A.土壤快速干燥后，土壤含水量（SWC）从正常水平（0. 25 g·gDW-1）分别下降至0.02和0.06 g·gDW-1，植物水势（Ψ）下降至-4和-3.2 MPa，根部ATP分别下降99.7%和42%。当快速干燥的土壤浇水长达6 d时，发现SWC和Ψ恢复到正常水平，但P.根中的ATP含量恢复到正常水平。侧柏和A. auriculifomis 分别恢复了 10% 和 23%。当P植物。侧柏和A.土壤缓慢干燥后，SWC分别从正常水平下降至0.1和0.13 g·gDW-1，Ψ下降至-2.5和-2 MPa，根部ATP含量分别下降98%和38%。当缓慢干燥的土壤浇水长达 8 d 时，P. 根中的 ATP 水平升高。侧柏和A.耳廓形菌分别恢复了 30% 和 24%。然而，木质部汁液中的 ATP 浓度不受 SWC 或 Ψ 的直接影响。发现木质部汁液 ATP 浓度与根 ATP 含量的图点呈对角线分布。结论是根部 ATP 对 SWC 变化的响应比对 Ψ 的响应更敏感，并且根源 ATP 是木质部汁液中 ATP 的来源。当植物进行缓慢的土壤干燥时，根部和木质部汁液中的 ATP 水平高于快速土壤干燥的情况。
The ATP in roots and xylem sap of two woody plant species,Platycladus orientalis andAcacia 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 ofP. orientalis andA. auriculiformis were subjected to rapid soil drying, respectively, as soil water content (SWC) decreased from the normal level ( 0. 25 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 ofP. orientalis andA. auriculifomis recovered by 10% and 23%, respectively. When plants ofP. orientalis andA. auriculiformis were subjected to slow soil drying, respectively, as SWC was found to decrease from the normal level to 0.1 and 0.13 g· gDW-1, separately, Ψ dropped to -2.5 and -2 MPa, differently, the ATP content in roots decreased 98% and 38%, respectively. When the slowly dried soil was watered for up to 8 d, ATP levels in roots ofP. orientalis andA. auriculiformis recovered by 30% and 24%, respectively. However, ATP concentrations in xylem sap were not directly influenced by either SWC or Ψ. The plot dots of xylem sap ATP concentration versus root ATP content were found to be distributed diagonally. It is concluded that ATP in roots is more sensitive in response to SWC changes than that to Ψ and root-sourced ATP is a source of that in xylem sap. When plants are subjected to slow soil drying, the ATP levels in both root and xylem sap are higher than that to rapid soil drying.
登录
查看更多内容
影响因子：
7.3
作者：
JACKSON, GE;IRVINE, J;KHALIL, AAM
通讯作者：
KHALIL, AAM
影响因子：
4.9
作者：
Liang, JS;Zhang, JH;Wong, MH
通讯作者：
Wong, MH
影响因子：
--
作者：
M. Deluca;W. D. Mcelroy
通讯作者：
M. Deluca;W. D. Mcelroy
影响因子：
2.8
作者：
F. R. Leach
通讯作者：
F. R. Leach
DOI：
--
发表时间：
1993
期刊：
--
影响因子：
--
作者：
H. Zhang
通讯作者：
H. Zhang