Abstract
Ethylene production, level of 1-aminocyclopropane-1-carboxylic acid (ACC) and activity of the ethylene forming enzyme (EFE) were higher in apices of gynoecious cucumber (Cucumis sativus cv. Alma) as compared to monoecious cucumber (C. sativus cv. Elem). Application of indole-3-acetic acid (IAA) enhanced ethylene and ACC production in both cultivars. The stimulatory effect of IAA was more pronounced in gynoecious apices. Induction of ethylene production and accumulation of ACC resulting from treatment with IAA were effectively blocked by aminoethoxyvinylglycine (AVG). Content of endogenous IAA, measured by an enzyme immunoassay, was lower in gynoecious cucumber as compared to monoecious one. Treatment of gynoecious plants with the antiauxins α-(p-chlorophenoxy)isobutyric acid (PCIB) and β-naphthaleneacetic acid (β-NAA) did not inhibit female sex expression.
It appears that although exogenous IAA enhances ACC and ethylene production, endogenous IAA might not have a major role in the control of sex expression in cucumber of the Beit-Alfa type.
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Prof. Rudich passed away in May 1986.
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Trebitsh, T., Rudich, J. & Riov, J. Auxin, biosynthesis of ethylene and sex expression in cucumber (Cucumis sativus). Plant Growth Regul 5, 105–113 (1987). https://doi.org/10.1007/BF00024738
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DOI: https://doi.org/10.1007/BF00024738