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Defoliation, Photosynthetic Rates, and Assimilate Transport in Grapevine Plants

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Abstract

The source-sink relations in grapevine (Vitis vinifera L., var. Rkatsiteli) plants were disturbed by defoliation at different stages of vegetative growth in order to investigate changes in photosynthetic activity and assimilate partitioning. Defoliation was shown to stimulate photosynthesis in the remaining source leaves, enhance the assimilate export, and diminish the midday suppression of photosynthesis. Defoliation created a powerful sink for assimilates, and stimulated their delivery to the affected zone. It is hypothesized that defoliation-induced stress is accompanied by a substantial enhancement of photosynthetic activity and by redistribution of assimilate flows, which enables a sustained supply of assimilates to the sink organs of grapevine plants.

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Abbreviations

PI:

plastochron index

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Authors and Affiliations

  1. Ketskhoveli Institue of Botany, Academy of Sciences of Georgia, Kodzhorskoe sh. 1, Tbilisi, 380007, Georgia

    Sh. Sh. Chanishvili, G. Sh. Badridze, T. F. Barblishvili & M. D. Dolidze

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  1. Sh. Sh. Chanishvili
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  2. G. Sh. Badridze
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  3. T. F. Barblishvili
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  4. M. D. Dolidze
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__________

Translated from Fiziologiya Rastenii, Vol. 52, No. 4, 2005, pp. 507–512.

Original Russian Text Copyright © 2005 by Chanishvili, Badridze, Barblishvili, Dolidze.

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Chanishvili, S.S., Badridze, G.S., Barblishvili, T.F. et al. Defoliation, Photosynthetic Rates, and Assimilate Transport in Grapevine Plants. Russ J Plant Physiol 52, 448–453 (2005). https://doi.org/10.1007/s11183-005-0066-x

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  • DOI: https://doi.org/10.1007/s11183-005-0066-x

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