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Literature DB >> 16658697

A polygalacturonase from citrus leaf explants: role in abscission.

Abstract

The relationship between polygalacturonase activity and abscission of citrus leaf explants was studied. Determination of polygalacturonase activity in citrus tissues requires concentration of the enzyme, use of a proper assay method, and inhibition of an oxidase present in the extracts which oxidizes the reaction products of the polygalacturonase. The polygalacturonase from citrus leaf explants is an exopolygalacturonase and appears to be a soluble enzyme.Polygalacturonase activity increased during abscission of citrus leaf explants and was localized in the separation layer. Ethylene accelerated the increase in polygalacturonase activity, but its effect was evident only after at least an 8-hour lag period. 2,4-Dichlorophenoxyacetic acid and cycloheximide inhibited abscission and polygalacturonase activity. It is concluded that polygalacturonase, in addition to cellulase, plays a role in abscission.

Entities: Chemical

Year: 1974 PMID： 16658697 PMCID： PMC541385 DOI： 10.1104/pp.53.2.312

Source DB: PubMed Journal: Plant Physiol ISSN： 0032-0889 Impact factor: 8.340

13 in total

1. Changes in cellulase and pectinase activities in fruit tissues and separation zones of citrus treated with cycloheximide.

Authors: G K Rasmussen
Journal: Plant Physiol Date: 1973-04 Impact factor: 8.340

10. Comparative transcriptional survey between laser-microdissected cells from laminar abscission zone and petiolar cortical tissue during ethylene-promoted abscission in citrus leaves.

Authors: Javier Agustí; Paz Merelo; Manuel Cercós; Francisco R Tadeo; Manuel Talón
Journal: BMC Plant Biol Date: 2009-10-23 Impact factor: 4.215

A polygalacturonase from citrus leaf explants: role in abscission.

1. Changes in cellulase and pectinase activities in fruit tissues and separation zones of citrus treated with cycloheximide.

2. Activity of pectin esterase and cellulase in the abscission zone of citrus leaf explants.

3. Role of RNA and protein synthesis in abscission.

4. Senescence processes in leaf abscission.

5. Abscission: the role of aging.

6. Cell wall dissolution and enzyme secretion during leaf abscission.

7. Further comparative studies of pectin esterase in relation to leaf and flower abscission.

8. The reactivity of flavoproteins with sulfite. Possible relevance to the problem of oxygen reactivity.

9. Ethylene-controlled Induction of Phenylalanine Ammonia-lyase in Citrus Fruit Peel.

10. Abscission: role of cellulase.

1. Flower abscission in mutant tomato plants.

2. Pectin-polygalacturonase in Citrus.

3. Role of polygalacturonase in bean leaf abscission.

4. Effect of ethylene on [C]indole-3-acetic Acid metabolism in leaf tissues of woody plants.

5. Abscission of citrus leaf explants: no correlation with naphthaleneacetic Acid conjugation in the abscission zone.

6. Cellulase activity and fruit softening in avocado.

7. Mercury-induced Ethylene Formation and Abscission in Citrus and Coleus Explants.

8. Cellulase Activity, Endogenous Abscisic Acid, and Ethylene in Four Citrus Cultivars during Maturation.

9. Cloning of a tomato polygalacturonase expressed in abscission.

10. Comparative transcriptional survey between laser-microdissected cells from laminar abscission zone and petiolar cortical tissue during ethylene-promoted abscission in citrus leaves.