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. 1980 Oct;66(4):750–753. doi: 10.1104/pp.66.4.750

Abscission of Citrus Leaf Explants

INTERRELATIONSHIPS OF ABSCISIC ACID, ETHYLENE, AND HYDROLYTIC ENZYMES

Oded Sagee 1, Raphael Goren 1, Joseph Riov 1
PMCID: PMC440716  PMID: 16661515

Abstract

The question whether abscisic acid (ABA) induces cellulase and polygalacturonase activity and, hence, abscission directly or whether its action is mediated by C2H4 was studied in citrus (Osbeck var. Shamouti) leaf explants using aminoethoxyvinyl glycine (AVG), an inhibitor of C2H4 biosynthesis. ABA in concentrations of 10 micromolar and higher induced C2H4 production and accelerated abscission. AVG inhibited C2H4 formation, activity of cellulase and polygalacturonase, and abscission in ABA-treated explants. AVG did not inhibit the increase in the activity of the cell-wall degrading enzymes or abscission in a saturating level of externally supplied C2H4. This indicates that the effect of AVG resulted from inhibition of the formation of endogenous ethylene. The data indicate that in citrus leaf explants the induction of the activity of cellulase and polygalacturonase and abscission by ABA is mediated by C2H4.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Abeles F. B. Abscission: role of cellulase. Plant Physiol. 1969 Mar;44(3):447–452. doi: 10.1104/pp.44.3.447. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Abeles F. B., Lonski J. Stimulation of lettuce seed germination by ethylene. Plant Physiol. 1969 Feb;44(2):277–280. doi: 10.1104/pp.44.2.277. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Beyer E. M. A potent inhibitor of ethylene action in plants. Plant Physiol. 1976 Sep;58(3):268–271. doi: 10.1104/pp.58.3.268. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Cooper W. C., Horanic G. Induction of abscission at hypobaric pressures. Plant Physiol. 1973 Jun;51(6):1002–1004. doi: 10.1104/pp.51.6.1002. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Cooper W. C., Rasmussen G. K., Rogers B. J., Reece P. C., Henry W. H. Control of abscission in agricultural crops and its physiological basis. Plant Physiol. 1968 Sep;43(9 Pt B):1560–1576. [PMC free article] [PubMed] [Google Scholar]
  6. Cracker L. E., Abeles F. B. Abscission: role of abscisic Acid. Plant Physiol. 1969 Aug;44(8):1144–1149. doi: 10.1104/pp.44.8.1144. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Gertman E., Fuchs Y. Effect of abscisic Acid and its interactions with other plant hormones on ethylene production in two plant systems. Plant Physiol. 1972 Jul;50(1):194–195. doi: 10.1104/pp.50.1.194. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Goren R., Altman A., Giladi I. Role of Ethylene in Abscisic Acid-induced Callus Formation in Citrus Bud Cultures. Plant Physiol. 1979 Feb;63(2):280–282. doi: 10.1104/pp.63.2.280. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Lieberman M., Baker J. E., Sloger M. Influence of Plant Hormones on Ethylene Production in Apple, Tomato, and Avocado Slices during Maturation and Senescence. Plant Physiol. 1977 Aug;60(2):214–217. doi: 10.1104/pp.60.2.214. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Marynick M. C. Patterns of Ethylene and Carbon Dioxide Evolution during Cotton Explant Abscission. Plant Physiol. 1977 Mar;59(3):484–489. doi: 10.1104/pp.59.3.484. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Mayak S., Dilley D. R. Regulation of Senescence in Carnation (Dianthus caryophyllus): Effect of Abscisic Acid and Carbon Dioxide on Ethylene Production. Plant Physiol. 1976 Nov;58(5):663–665. doi: 10.1104/pp.58.5.663. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Owens L. D., Lieberman M., Kunishi A. Inhibition of ethylene production by rhizobitoxine. Plant Physiol. 1971 Jul;48(1):1–4. doi: 10.1104/pp.48.1.1. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Ratner A., Goren R., Monselise S. P. Activity of pectin esterase and cellulase in the abscission zone of citrus leaf explants. Plant Physiol. 1969 Dec;44(12):1717–1723. doi: 10.1104/pp.44.12.1717. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Riov J. A polygalacturonase from citrus leaf explants: role in abscission. Plant Physiol. 1974 Feb;53(2):312–316. doi: 10.1104/pp.53.2.312. [DOI] [PMC free article] [PubMed] [Google Scholar]

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