Root-derived trans-zeatin riboside and abscisic acid in drought-stressed and rewatered sunflower plants: interaction in the control of leaf diffusive resistance?

Functional Plant Biology : FPB
Hauke Hansen, Karl Dörffling

Abstract

Four-week-old potted sunflower plants (Helianthus annuus L.) were exposed to drought for up to two days by withholding irrigation. During the stress treatment and after rewatering, xylem sap was collected from decapitated hypocotyls by pressurising the root system. The water potential (Ψw) of the hypocotyl, the diffusive resistance of the second leaf pair, total transpiration and the concentration and flux rates of ABA and trans-zeatin riboside (ZR), identified by combined gas chromatography-mass spectrometry (GC-MS) as the dominant cytokinin in xylem sap, were determined. ABA contents were also analysed in root and leaf tissue. When Ψw of the hypocotyl decreased, the concentration and flux rate of ZR decreased drastically after a transient rise. A significant rise in ABA concentration and flux rate in xylem sap as well as a parallel rise in leaf diffusive resistance occurred as soon as Ψw reached values of -0.4 MPa and lower. Root ABA concentration began to rise at the same water potential parallel to the rise in xylem sap, whereas the ABA concentration in leaves began to rise only at Ψw values lower than -0.6MPa. Treatment of the root system with norflurazon prior to drought stress suppressed the increase in the ABA concentra...Continue Reading

Citations

Jul 31, 2019·Plant & Cell Physiology·Wei-Chen WangYu-Chang Tsai
Jul 6, 2017·International Journal of Molecular Sciences·Agnieszka BielachVanesa B Tognetti
Jul 20, 2019·Biomolecules·Anket SharmaBingsong Zheng
Jan 30, 2015·Journal of Experimental Botany·Ian C DoddMartin S A Blackwell
Mar 5, 2020·The New Phytologist·Sumudu S KarunadasaJan A Smalle
Apr 26, 2015·Journal of Experimental Botany·Paul J Zwack, Aaron M Rashotte
Mar 23, 2021·Plant Cell Reports·Prafull SalviMehanathan Muthamilarasan

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