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Record 49 of 251
Osmotic stress, endogenous abscisic acid and the control of leaf morphology in Hippuris vulgaris L
Author and Affiliation:
Goliber, T. E.(University of California, Department of Botany, Berkeley 94720, United States)
Feldman, L. J.
Abstract: Previous reports indicate that heterophyllous aquatic plants can be induced to form aerial-type leaves on submerged shoots when they are grown in exogenous abscisic acid (ABA). This study reports on the relationship between osmotic stress (e.g. the situation encountered by a shoot tip when it grows above the water surface), endogenous ABA (as measured by gas chromatography-electron capture detector) and leaf morphology in the heterophyllous aquatic plant, Hippuris vulgaris. Free ABA could not be detected in submerged shoots of H. vulgaris but in aerial shoots ABA occurred at ca. 40 ng (g fr wt)-1. When submerged shoots were osmotically stressed ABA appeared at levels of 26 to 40 ng (g fr wt)-1. These and other data support two main conclusions: (1) Osmotically stressing a submerged shoot causes the appearance of detectable levels of ABA. (2) The rise of ABA in osmotically stressed submerged shoots in turn induces a change in leaf morphology from the submerged to the aerial form. This corroborates the hypothesis that, in the natural environment, ABA levels rise in response to the osmotic stress encountered when a submerged shoot grows up through the water/air interface and that the increased ABA leads to the production of aerial-type leaves.
Publication Date: Jan 01, 1989
Document ID:
20040089565
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Plant, cell & environment (ISSN 0140-7791); Volume 12; 2; 163-71
Publisher Information: United Kingdom
Contract/Grant/Task Num: NAGW-239
Financial Sponsor: NASA; Washington DC United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ABSCISIC ACID; LEAVES; MORPHOLOGY; OSMOSIS; PLANTS (BOTANY); AQUICULTURE; EXOBIOLOGY; METABOLISM; PLANT PHYSIOLOGY; STEMS; WATER
Other Descriptors: ABSCISIC ACID/ANALYSIS/METABOLISM/PHYSIOLOGY; OSMOTIC PRESSURE; PLANT LEAVES/ANATOMY & HISTOLOGY/GROWTH & DEVELOPMENT/METABOLISM/PHYSIOLOGY; PLANTS/ANATOMY & HISTOLOGY/GROWTH & DEVELOPMENT/METABOLISM; AQUACULTURE; PLANT PHYSIOLOGY; PLANT SHOOTS/CHEMISTRY/GROWTH & DEVELOPMENT/METABOLISM/PHYSIOLOGY; SUPPORT, U.S. GOV'T, NON-P.H.S; WATER/METABOLISM; NASA DISCIPLINE NUMBER 29-20; NASA DISCIPLINE PLANT BIOLOGY; NASA PROGRAM SPACE BIOLOGY; NON-NASA CENTER
Availability Source: Other Sources
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