Influence of water deficits on the abscisic acid and indole-3-acetic acid contents of cotton flower buds and flowers

A field experiment was conducted during the summer of 1988 to test the hypothesis that water deficit affects the abscisic acid (ABA) and indole acetic acid (IAA) concentrations in cotton (Gossypium hirsutum L.) flower buds in ways that predispose young fruits (bolls) that subsequently develop from t...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1990-07, Vol.93 (3), p.1117-1120
Main Authors: Guinn, G. (USDA, ARS, Western Cotton Research Lab., Phoenix, AZ), Dunlap, J.R, Brummett, D.L
Format: Article
Language:English
Subjects:
Abscission
ACIDE ABSCISSIQUE
ACIDE INDOLACETIQUE
ACIDO ABSCISICO
ACIDO INDOLACETICO
ARIZONA
BALANCE HIDRICO
BILAN HYDRIQUE
Biological and medical sciences
Bolls
BOURGEON
COMPOSICION
COMPOSITION
Cotton
Deficit irrigation
Environmental and Stress Physiology
FEUILLE
FLEUR
FLORES
Flower buds
Flowering
Flowers
Fruiting
Fundamental and applied biological sciences. Psychology
GOSSYPIUM HIRSUTUM
HOJAS
Indoleacetic acids
IRRIGATION
Plant physiology and development
Plants
RELACIONES PLANTA AGUA
RELATION PLANTE EAU
RIEGO
Senescence and abscission
Vegetative apparatus, growth and morphogenesis. Senescence
YEMA (PLANTA)
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Summary:A field experiment was conducted during the summer of 1988 to test the hypothesis that water deficit affects the abscisic acid (ABA) and indole acetic acid (IAA) concentrations in cotton (Gossypium hirsutum L.) flower buds in ways that predispose young fruits (bolls) that subsequently develop from them to increased abscission rates. Water deficit had little effect on the ABA content of flower buds but increased the ABA content of flowers as much as 66%. Water deficit decreased the concentrations of free and conjugated IAA in flower buds during the first irrigation cycle but increased them during the second cycle. Flowers contained much less IAA than buds. Water deficit slightly increased the conjugated IAA content of flowers but had no effect on the concentration of free IAA in flowers. Because water deficit slightly increased the ABA content but did not decrease the IAA content of flowers, any carry-over effect of water deficit on young boll shedding might have been caused by changes in ABA but not from changes in IAA
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.93.3.1117