Alternation of wet and dry sides during partial rootzone drying irrigation alters root-to-shoot signalling of abscisic acid

Functional Plant Biology : FPB
Ian C DoddWilliam J Davies

Abstract

Partial rootzone drying (PRD) is an irrigation technique where water is distributed unevenly to the root system such that part is irrigated while the remainder is allowed to dry the soil. Tomato (Lycopersicon esculentum Mill.) plants were grown with their roots in two soil columns to compare the physiological consequences of alternation of wet and dry columns during PRD irrigation (alternate PRD, PRD-A) with retention of the same wet and dry columns (fixed PRD, PRD-F). When PRD plants received 50% less water than well-watered (WW) plants, xylem ABA concentration ([X-ABA]) increased and stomatal conductance decreased relative to WW plants. Although both sets of PRD plants received the same amount of water, [X-ABA] of PRD-A plants increased up to 2-fold above that of PRD-F plants, which further decreased stomatal conductance. Differences in [X-ABA] were detected within an hour of alternation, but did not persist beyond the photoperiod of alternation. [X-ABA] increased linearly as whole-pot soil water content (θpot) and leaf water potential (Ψleaf) declined, but the difference in [X-ABA] between the two sets of PRD plants was not due to differences in either θpot or Ψleaf. In PRD-F plants, the unwatered part of the root system con...Continue Reading

References

Sep 28, 2000·Journal of Experimental Botany·M StollP Dry
Dec 1, 1972·Plant Physiology·Y Mizrahi, A E Richmond

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Citations

Sep 10, 2020·Journal of Experimental Botany·Ying LiWeifeng Xu
Jun 6, 2009·Journal of Experimental Botany·Ian C Dodd
Jan 30, 2015·Journal of Experimental Botany·Ian C DoddMartin S A Blackwell
Jun 1, 2015·Functional Plant Biology : FPB·Abraham Blum
May 16, 2009·Journal of Experimental Botany·Sally Wilkinson, Wolfram Hartung
Aug 5, 2017·Frontiers in Plant Science·Renu SaradadeviKadambot H M Siddique
Nov 21, 2020·International Journal of Molecular Sciences·Daniel Marusig, Sergio Tombesi

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