Changes in abscisic acid and indoleacetic acid before and after anthesis relative to changes in abscission rates of cotton fruiting forms

• Published in: Plant physiology (Bethesda) Vol. 87; no. 3; pp. 629 - 631
• Main Authors: Guinn, G, Brummett, D.L
• Format: Journal Article
• Language: English
• Published: Rockville, MD American Society of Plant Physiologists 01.07.1988
• Subjects: ABA; ABSCISION; ABSCISSION; ACIDE ABSCISSIQUE; ACIDE INDOLACETIQUE; ACIDO ABSCISICO; ACIDO INDOLACETICO; ARIZONA; Biological and medical sciences; Bolls; Cotton; Development and Growth Regulation; FLORACION; FLORAISON; Flower buds; FLOWERING; FRUCTIFICACION; FRUCTIFICATION; Fruit drop; FRUITING; Fruits; Fundamental and applied biological sciences. Psychology; GOSSYPIUM HIRSUTUM; IAA; Indoleacetic acids; Plant physiology and development; Plants; Vegetative apparatus, growth and morphogenesis. Senescence; Malvaceae; Auxin; Noise; Dicotyledones; Angiospermae; Flower bud; Abscisic acid; Flowering; Plant growth substance; Spermatophyta; Gossypium hirsutum; Abscission
• DOI: 10.1104/pp.87.3.629
• ISSN: 0032-0889

Cotton (Gossypium hirsutum L.) fruiting forms exhibit pronounced changes, with age, in their probability of abscission. Large floral buds rarely abscise, but after anthesis the young fruits (bolls) have a high probability of abscising. Abscission rate reaches a peak about 5 to 6 days after anthesis and then gradually decreases. An experiment was conducted to try to determine the reason for the rapid and pronounced increase in probability of abscission just after anthesis. Cotton was grown in the field and fruiting forms of various ages from 9 days before to 9 days after anthesis were all harvested the same day and subsequently analyzed for ABA and IAA. The concentration of ABA decreased slightly at anthesis and increased gradually thereafter. In contrast, the concentration of IAA was high before anthesis and then decreased at anthesis to about one-fifth the previous concentration. IAA remained low for at least 4 days after anthesis and then increased rapidly between 7 and 9 days after anthesis. The high concentration of IAA in floral buds before anthesis is probably a major factor in their resistance to abscission. Likewise, the low concentration of IAA at anthesis and for about 4 days thereafter may promote fruit abscission during the young boll stage.