Soil moisture heterogeneity during deficit irrigation alters root-to-shoot signalling of abscisic acid

Functional Plant Biology : FPB
Ian C Dodd

Abstract

The effects of different irrigation techniques on leaf xylem ABA concentration ([X-ABA]leaf) were compared in tomato (Lycopersicon esculentum Mill.). During partial rootzone drying (PRD), water was distributed unevenly to the root system such that part was irrigated while the remainder was allowed to dry the soil. During conventional deficit irrigation (DI), plants received the same volume of water as PRD plants, but water was distributed evenly to the entire root system. When the plant root system was allowed to explore two separate soil compartments, DI plants had a higher [X-ABA]leaf than PRD plants with moderate soil drying, but PRD plants had a higher [X-ABA]leaf than DI plants as the soil dried further. The difference in [X-ABA]leaf between the two sets of plants was not because of differences in either whole pot soil water content (θpot) or leaf water potential (Ψleaf). To investigate the contribution of different parts of the root system to [X-ABA]leaf, individual shoots were grafted onto the root systems of two plants grown in two separate pots, so that the graft union had the appearance of an inverted 'Y'. After sap collection from detached leaves, removal of the shoot below the graft union allowed sap collection from...Continue Reading

References

Sep 28, 2000·Journal of Experimental Botany·M StollP Dry
Jan 25, 2002·Journal of Experimental Botany·Angela Sauter, Wolfram Hartung
Jul 1, 2003·Functional Plant Biology : FPB·Tiago P Dos SantosM Manuela Chaves

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Citations

Apr 16, 2015·Journal of Experimental Botany·Taisheng DuWilliam J Davies
Oct 28, 2010·Journal of Integrative Plant Biology·Lie-Bo ShuHan-Wei Mei
Aug 5, 2017·Frontiers in Plant Science·Renu SaradadeviKadambot H M Siddique
Feb 13, 2018·Journal of Experimental Botany·Carlos De OllasIan C Dodd
Jun 19, 2012·Omics : a Journal of Integrative Biology·Milena MarjanovićMireille Faurobert
Jun 6, 2009·Journal of Experimental Botany·Ian C Dodd
Jan 11, 2021·Plant Methods·Iñigo Saiz-FernándezBřetislav Brzobohatý

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