Root ABA Accumulation in Long-Term Water-Stressed Plants is Sustained by Hormone Transport from Aerial Organs
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Altres documents de l'autoria: Manzi Fraga, Matías Jesús; Lado, Joanna; Rodrigo, María Jesús; Zacarías, Lorenzo; Arbona, Vicent; Gomez-Cadenas, Aurelio
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Títol
Root ABA Accumulation in Long-Term Water-Stressed Plants is Sustained by Hormone Transport from Aerial OrgansAutoria
Data de publicació
2015Editor
Oxford University PressISSN
0032-0781; 1471-9053Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pcp.oxfordjournals.org/content/56/12/2457.fullParaules clau / Matèries
Resum
The 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 ... [+]
The 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. [-]
Publicat a
Plant Cell Physiol (2015) 56 (12): 2457-2466Drets d'accés
© 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.com
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