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dc.contributor.authorManzi Fraga, Matías Jesús
dc.contributor.authorLado, Joanna
dc.contributor.authorRodrigo, María Jesús
dc.contributor.authorZacarías, Lorenzo
dc.contributor.authorArbona, Vicent
dc.contributor.authorGómez Cadenas, Aurelio
dc.description.abstractThe reduced pool of the ABA precursors, b,b-carotenoids, in roots does not account for the substantial increase in ABA content in response to water stress (WS) conditions, suggesting that ABA could be transported from other organs. Basipetal transport was interrupted by stem-girdling, and ABA levels were determined in roots after two cycles of WS induced by transplanting plants to dry perlite. Leaf applications of isotope-labeled ABA and reciprocal grafting of ABA-deficient tomato mutants were used to confirm the involvement of aerial organs on root ABA accumulation. Disruption of basipetal transport reduced ABA accumulation in roots, and this decrease was more severe after two consecutive WS periods. This effect was linked to a sharp decrease in the b,b-carotenoid pool in roots in response to water deficit. Significant levels of isotope-labeled ABA were transported from leaves to roots, mainly in plants subjected to water dehydration. Furthermore, the use of different ABA-deficient tomato mutants in reciprocal grafting combinations with wild-type genotypes confirmed the involvement of aerial organs in the ABA accumulation in roots. In conclusion, accumulation of ABA in roots after long-term WS periods largely relies on the aerial organs, suggesting a reduced ability of the roots to synthesize ABA from carotenoids. Furthermore, plants are able to transport ABA basipetally to sustain high hormone levels in roots.ca_CA
dc.description.sponsorShipMinisterio de Economia (MINECO) AGL2013-42038-R Universitat Jaume I AGL2013-42038-R P1IB2013-23 Generalitat Valenciana (Spain)ca_CA
dc.format.extent10 p.ca_CA
dc.publisherOxford University Pressca_CA
dc.relation.isPartOfPlant Cell Physiol (2015) 56 (12): 2457-2466ca_CA
dc.rights© The Author 2015. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oup.comca_CA
dc.subjectBasipetal transportca_CA
dc.subjectWater deficitca_CA
dc.titleRoot ABA Accumulation in Long-Term Water-Stressed Plants is Sustained by Hormone Transport from Aerial Organsca_CA

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