TY - JOUR

T1 - Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

AU - Li, Wenrao

AU - de Ollas, Carlos

AU - Dodd, Ian C.

N1 - This is the peer reviewed version of the following article: Li W, de Ollas C, Dodd IC (2017) Long‐distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations. J Integr Plant Biol 60: 16–33 which has been published in final form at https://onlinelibrary.wiley.com/doi/abs/10.1111/jipb.12605 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

PY - 2018/1

Y1 - 2018/1

N2 - Environmental stresses that perturb plant water relations influence abscisic acid (ABA) concentrations, but it is unclear whether long-distance ABA transport contributes to changes in local ABA levels. To determine the physiological relevance of ABA transport, we made reciprocal- and self-grafts of ABA-deficient flacca mutant and wild-type (WT) tomato plants, in which low phosphorus (P) conditions decreased ABA concentrations while salinity increased ABA concentrations. Whereas foliar ABA concentrations in the WT scions were rootstock independent under conditions, salinity resulted in long-distance transport of ABA: flacca scions had approximately twice as much ABA when grafted on WT rootstocks compared to flacca rootstocks. Root ABA concentrations were scion dependent: both WT and flacca rootstocks had less ABA with the flacca mutant scion than with the WT scion under conditions. In WT scions, whereas rootstock genotype had limited effects on stomatal conductance under conditions, a flacca rootstock decreased leaf area of stressed plants, presumably due to attenuated root-to-shoot ABA transport. In flacca scions, a WT rootstock decreased stomatal conductance but increased leaf area of stressed plants, likely due to enhanced root-to-shoot ABA transport. Thus, long-distance ABA transport can affect responses in distal tissues by changing local ABA concentrations.

AB - Environmental stresses that perturb plant water relations influence abscisic acid (ABA) concentrations, but it is unclear whether long-distance ABA transport contributes to changes in local ABA levels. To determine the physiological relevance of ABA transport, we made reciprocal- and self-grafts of ABA-deficient flacca mutant and wild-type (WT) tomato plants, in which low phosphorus (P) conditions decreased ABA concentrations while salinity increased ABA concentrations. Whereas foliar ABA concentrations in the WT scions were rootstock independent under conditions, salinity resulted in long-distance transport of ABA: flacca scions had approximately twice as much ABA when grafted on WT rootstocks compared to flacca rootstocks. Root ABA concentrations were scion dependent: both WT and flacca rootstocks had less ABA with the flacca mutant scion than with the WT scion under conditions. In WT scions, whereas rootstock genotype had limited effects on stomatal conductance under conditions, a flacca rootstock decreased leaf area of stressed plants, presumably due to attenuated root-to-shoot ABA transport. In flacca scions, a WT rootstock decreased stomatal conductance but increased leaf area of stressed plants, likely due to enhanced root-to-shoot ABA transport. Thus, long-distance ABA transport can affect responses in distal tissues by changing local ABA concentrations.

KW - TOMATO LYCOPERSICON-ESCULENTUM

KW - ABSCISIC-ACID BIOSYNTHESIS

KW - PHOSPHORUS AVAILABILITY

KW - STOMATAL CONDUCTANCE

KW - TRANSPIRATION RATE

KW - RECIPROCAL GRAFTS

KW - ALDEHYDE OXIDASE

KW - DROUGHT STRESS

KW - SOIL-MOISTURE

KW - WATER-STRESS

U2 - 10.1111/jipb.12605

DO - 10.1111/jipb.12605

M3 - Journal article

VL - 60

SP - 16

EP - 33

JO - Journal of Integrative Plant Biology

JF - Journal of Integrative Plant Biology

SN - 1672-9072

IS - 1

ER -