Characteristics of a Diurnal Rhythm of Assimilate Translocation in Grapevine Plants

Characteristics of a Diurnal Rhythm of Assimilate Translocation in Grapevine Plants Characteristics of photoassimilate efflux from the leaves of grapevine (Vitis vinifera L., var. Rkatsiteli) plants under natural conditions and upon darkening, defoliation, and ABA treatment at short exposures (2, 6, and 24 h) as well as diurnal pattern of starch content in the leaves were investigated. Translocation of assimilates from the leaves of grapevine usually occurred at night and started after 20:00 or 21:00. However, such pattern of translocation was not strictly determinated and could be changed upon the action of some factors. Darkening, defoliation, and treatment with ABA initiated the translocation of photoassimilates from the leaves in the daytime. Darkening and ABA treatment turned out to be more efficient than defoliation. Darkening and defoliation significantly changed the character of partitioning of photoassimilates in the stem. We corroborated the opinion that in grapevine, the efflux of assimilates from source leaves is also governed by the feedback mechanism and probably much depends on the level of carbohydrates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Characteristics of a Diurnal Rhythm of Assimilate Translocation in Grapevine Plants

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2004 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/B:RUPP.0000011302.12437.69
Publisher site
See Article on Publisher Site

Abstract

Characteristics of photoassimilate efflux from the leaves of grapevine (Vitis vinifera L., var. Rkatsiteli) plants under natural conditions and upon darkening, defoliation, and ABA treatment at short exposures (2, 6, and 24 h) as well as diurnal pattern of starch content in the leaves were investigated. Translocation of assimilates from the leaves of grapevine usually occurred at night and started after 20:00 or 21:00. However, such pattern of translocation was not strictly determinated and could be changed upon the action of some factors. Darkening, defoliation, and treatment with ABA initiated the translocation of photoassimilates from the leaves in the daytime. Darkening and ABA treatment turned out to be more efficient than defoliation. Darkening and defoliation significantly changed the character of partitioning of photoassimilates in the stem. We corroborated the opinion that in grapevine, the efflux of assimilates from source leaves is also governed by the feedback mechanism and probably much depends on the level of carbohydrates.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 18, 2004

References

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