About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in AJ

  1. Vol. 86 No. 5, p. 775-782
     
    Received: Apr 26, 1993
    Published: Sept, 1994


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1994.00021962008600050006x

Root-to-Shoot Communication in Flooded Plants: Involvement of Abscisic Acid, Ethylene, and 1-Aminocyciopropane-l-carboxylic Acid

  1. Michael B. Jackson 
  1. Dep. of Agricultural Sciences, Univ. of Bristol, AFRC Institute of Arable Crops Res., Long Ashton Res. Stn., Bristol BS18 9AF, UK.

Abstract

Abstract

Nonhydraulic communication between roots and shoots of flooded plants is reviewed. Contrary to reports for roots of droughted plants, those of flooded tomato plants (Lycopersicon esculentum L.) did not export increased amounts of abscisic acid (ABA) to the shoots, even though stomata closed in association with increased foliar ABA, and in the absence of marked losses in leaf hydration. Flooded tomato root systems did export more of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC). Ethylene formed in the leaves by oxidation the ACC to ethylene and the epinastic leaf curvatures the ethylene induced were found to be inhibited in tomato plants transformed with an antisense gene to the ethylene-forming enzyme ACC oxidase. Our estimates of the concentration and delivery of ABA and ACC in the xylem sap as it passes into the shoot from the roots avoided artifacts associated with variable sap flow rates and temporary contamination from wounded tissue. Measurements of ethylene production by individual roots of intact seedlings of maize (Zea mays L.) by highly sensitive photoacoustic laser detection confirmed earlier work linking enhanced ethylene evolution with more extensive aerenchyma development in roots that are partially deficient in oxygen. The development of aerenchyma enhances oxygen movement from shoots to roots.

Presented as part of the symposium on rhizosphere research in honor of Howard M. Taylor, ASA-CSSA-SSSA annual meeting, Minneapolis, MN, 2 Nov. 1992; sponsored by Div. S-6, S-l, and S-7

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .