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Title: Sites of abscisic acid synthesis and metabolism in Ricinus communis L

Abstract

The sites of abscisic acid (ABA) synthesis and metabolism in Ricinus communis L. were investigated by analyzing the levels of ABA and its two metabolites phaseic acid (PA) and dihydrophaseic acid (DPA) in the shoot tips, mature leaves, and phloem sap of stressed and nonstressed plants. Water stress increased the concentration of ABA, PA, and DPA in phloem exudate and also increased the levels of all three compounds in mature leaves and in shoot tips. The latter had a very high DPA content (18.7 ..mu..g/g fresh weight) even in plants not subjected to water stress. When young and mature leaves were excised and allowed to wilt, the level of ABA increased in both, demonstrating that leaves at an early stage of development have the capacity to produce ABA. These results have been interpreted to mean that in mature leaves of nonstressed Ricinus plants, ABA is synthesized and metabolized, and that ABA itself, as well as its metabolites, are translocated in the phloem to the shoot tips (sinks). Since DPA, but not ABA, accumulates in the shoot tips, it follows that ABA is metabolized rapidly in the apical region. To what extent ABA present in young leaves of nonstressed plants ismore » the consequence of synthesis in situ and of import from older leaves remains to be determined.« less

Authors:
Publication Date:
Research Org.:
Michigan State Univ., East Lansing
OSTI Identifier:
7291174
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plant Physiol.; (United States); Journal Volume: 59:5
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; PLANTS; BIOCHEMICAL REACTION KINETICS; BIOLOGICAL STRESS; BIOSYNTHESIS; GROWTH; INHIBITION; LEAVES; METABOLISM; PLANT GROWTH; PLANT STEMS; STIMULATION; BIOMASS; ENERGY SOURCES; KINETICS; REACTION KINETICS; RENEWABLE ENERGY SOURCES; SYNTHESIS; 550200* - Biochemistry; 550500 - Metabolism

Citation Formats

Zeevaart, J.A.D. Sites of abscisic acid synthesis and metabolism in Ricinus communis L. United States: N. p., 1977. Web. doi:10.1104/pp.59.5.788.
Zeevaart, J.A.D. Sites of abscisic acid synthesis and metabolism in Ricinus communis L. United States. doi:10.1104/pp.59.5.788.
Zeevaart, J.A.D. Sun . "Sites of abscisic acid synthesis and metabolism in Ricinus communis L". United States. doi:10.1104/pp.59.5.788.
@article{osti_7291174,
title = {Sites of abscisic acid synthesis and metabolism in Ricinus communis L},
author = {Zeevaart, J.A.D.},
abstractNote = {The sites of abscisic acid (ABA) synthesis and metabolism in Ricinus communis L. were investigated by analyzing the levels of ABA and its two metabolites phaseic acid (PA) and dihydrophaseic acid (DPA) in the shoot tips, mature leaves, and phloem sap of stressed and nonstressed plants. Water stress increased the concentration of ABA, PA, and DPA in phloem exudate and also increased the levels of all three compounds in mature leaves and in shoot tips. The latter had a very high DPA content (18.7 ..mu..g/g fresh weight) even in plants not subjected to water stress. When young and mature leaves were excised and allowed to wilt, the level of ABA increased in both, demonstrating that leaves at an early stage of development have the capacity to produce ABA. These results have been interpreted to mean that in mature leaves of nonstressed Ricinus plants, ABA is synthesized and metabolized, and that ABA itself, as well as its metabolites, are translocated in the phloem to the shoot tips (sinks). Since DPA, but not ABA, accumulates in the shoot tips, it follows that ABA is metabolized rapidly in the apical region. To what extent ABA present in young leaves of nonstressed plants is the consequence of synthesis in situ and of import from older leaves remains to be determined.},
doi = {10.1104/pp.59.5.788},
journal = {Plant Physiol.; (United States)},
number = ,
volume = 59:5,
place = {United States},
year = {Sun May 01 00:00:00 EDT 1977},
month = {Sun May 01 00:00:00 EDT 1977}
}