Plant and Soil

, Volume 380, Issue 1–2, pp 375–387 | Cite as

Signalling mechanisms involved in the response of two varieties of Humulus lupulus L. to soil drying: I. changes in xylem sap pH and the concentrations of abscisic acid and anions

  • Halyna Korovetska
  • Ondřej Novák
  • Oldřich Jůza
  • Vit Gloser
Regular Article

Abstract

Background and aims

Soil drying leads to the generation of chemical signals in plants that regulate water use via control of the stomatal aperture. The aim of our work was to identify the presence and identity of potential chemical signals, their dynamics, and their relationship with transpiration rate during soil drying in hop (Humulus lupulus (L.)) plants.

Methods

We used pressure chamber technique for measurement of shoot water potential and collection of shoot xylem sap. We analyzed concentrations of abscisic acid (ABA), nitrate, phosphate, sulphate and malate in sap and also the rate of whole plant transpiration.

Results

Transpiration rate decreased prior to changes in shoot water potential. The concentration of ABA in xylem sap continuously increased from early to later stages of water stress, whereas in leaves it increased only at later stages. Shoot sap pH increased simultaneously with the decrease of transpiration rate. Xylem sap alkalization was in some cases accompanied by a decrease in nitrate concentration and an increase in malate concentration. Concentration of sulphate increased in xylem sap during drying and sulphate in combination with a higher ABA concentration enhanced stomatal closure.

Conclusions

Several early chemical signals appear in sap of hop plants during soil drying and their impact on transpiration may vary according to the stage of soil drying.

Keywords

Abscisic acid (ABA) Hops Malate Sulphate Transpiration rate 

Abbreviations

ABA

Abscisic acid

SWP

Stem water potential

SWC

Soil water content

TR

Transpiration rate

Supplementary material

11104_2014_2101_MOESM1_ESM.pdf (161 kb)
ESM 1(PDF 160 kb)

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Halyna Korovetska
    • 1
  • Ondřej Novák
    • 2
  • Oldřich Jůza
    • 1
  • Vit Gloser
    • 1
  1. 1.Faculty of Science, Department of Experimental BiologyMasaryk UniversityBrnoCzech Republic
  2. 2.Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany Academy of Sciences of the Czech Republicv.v.i. & Palacký UniversityOlomoucCzech Republic

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