Accounting for sap flow from different parts of the root system improves the prediction of xylem ABA concentration in plants grown with heterogeneous soil moisture.
Accounting for sap flow from different parts of the root system improves the prediction of xylem ABA concentration in plants grown with heterogeneous soil moisture.
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DOI：
10.1093/jxb/ern246
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发表时间：
2008
影响因子：
6.9
通讯作者：
Davies, William J.
中科院分区：
文献类型：
--
作者：
Dodd, Ian C.;Egea, Gregorio;Davies, William J.
当土壤水分不均匀时，根系不同部位的液流和阿坝状态影响叶片木质部阿坝浓度（[X-ABA]leaf）。评估了用于预测[X-ABA]叶的模型的稳健性。“两根一梢”嫁接向日葵（Helianthus annuus L.）植物接受亏缺灌溉（DI，每个根系接受相同的灌溉量）或部分根区干燥（PRD，仅一个根系浇水，另一个根系干燥土壤）。无论是否相对液流进行评估，使用液流传感器在体内或通过加压的去顶根，每个根系统的贡献类似于总液流在DI，而液流从根在干燥的土壤中下降与土壤水势线性（土壤水分）在PRD。虽然灌溉盆的湿润土壤决定了干土中根系液流下降的阈值湿润土壤，但这种下降的斜率与湿盆湿润土壤无关。无论收集的汁液是从湿润或干燥的根系统的PRD植物，或DI植物，根木质部阿坝浓度增加，土壤肥力下降。该模型，加权阿坝贡献，每个根系根据从每个液流，几乎完美地解释了[X-ABA]立即以上的嫁接联合。该模型高估了[X-ABA]叶片的测定值，可能是由于[X-ABA]沿着运输途径的变化或从离体叶片中收集木质部汁液的人为因素造成的。通过部分干根液流下降的影响，在珠江三角洲的气孔行为和灌溉调度的控制进行了讨论。
When soil moisture is heterogeneous, sap flow from, and ABA status of, different parts of the root system impact on leaf xylem ABA concentration ([X-ABA]leaf). The robustness of a model for predicting [X-ABA]leaf was assessed. ‘Two root-one shoot’ grafted sunflower (Helianthus annuus L.) plants received either deficit irrigation (DI, each root system received the same irrigation volumes) or partial rootzone drying (PRD, only one root system was watered and the other dried the soil). Irrespective of whether relative sap flow was assessed using sap flow sensors in vivo or by pressurization of de-topped roots, each root system contributed similarly to total sap flow during DI, while sap flow from roots in drying soil declined linearly with soil water potential (Ψsoil) during PRD. Although Ψsoil of the irrigated pot determined the threshold Ψsoil at which sap flow from roots in drying soil decreased, the slope of this decrease was independent of the wet pot Ψsoil. Irrespective of whether sap was collected from the wet or dry root system of PRD plants, or a DI plant, root xylem ABA concentration increased as Ψsoil declined. The model, which weighted ABA contributions of each root system according to the sap flow from each, almost perfectly explained [X-ABA] immediately above the graft union. That the model overestimated measured [X-ABA]leaf may result from changes in [X-ABA] along the transport pathway or an artefact of collecting xylem sap from detached leaves. The implications of declining sap flow through partially dry roots during PRD for the control of stomatal behaviour and irrigation scheduling are discussed.
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影响因子：
6.9
作者：
Kudoyarova, Guzel R.;Vysotskaya, Lidia B.;Dodd, Ian C.
通讯作者：
Dodd, Ian C.
影响因子：
4.3
作者：
QUARRIE, SA;WHITFORD, PN;LOVEYS, BR
通讯作者：
LOVEYS, BR
DOI：
10.1071/pp96079
发表时间：
1997-01-01
期刊：
AUSTRALIAN JOURNAL OF PLANT PHYSIOLOGY
影响因子：
--
作者：
Reid, JB;Renquist, AR
通讯作者：
Renquist, AR
影响因子：
6.7
作者：
Du, Taisheng;Kang, Shaozhong;Hu, Xiaotao
通讯作者：
Hu, Xiaotao
影响因子：
5.7
作者：
Liu, Fulai;Song, Ri;Jensen, Christian R.
通讯作者：
Jensen, Christian R.