The berry shrinking phenomenon in cv Shiraz (Vitis vinifera L.) is to date much debated. Currently, the critical points in Shiraz pre-harvest shrinkage are: a) the role of the xylem during post-véraison; b) the existence and timing of xylematic back flow and c) the functionality of the phloem. In order to try to resolve these issues, we traced the xylematic flows from the vine to the berry and vice versa by using the fuchsin acid as a xylematic tracer. At berry maturity, in order to verify also the phloematic functionality, we used the fluorescent tracer 6(5)-carboxyfluorescein diacetate (CFDA). The results showed clearly that the vine gradually loses the ability to deliver water to the berries via pedicel during ripening. The xylematic back-flow is active in the pre-véraison but not in the post-véraison berries. Furthermore, the CFDA experiments showed the absence of flow from the plant to the berry and vice versa at berry maturity. In cv Shiraz véraison seems to be the crucial point in the berry dehydration understanding: in pre-véraison there is a ‘plant/berry’ and ‘berry/plant’ water communication, whereas in post-véraison this seems to cease progressively.

Pre-harvest berry shrinkage in cv ‘Shiraz’ (Vitis vinifera L.): Understanding sap flow by means of tracing

Antonio Carlomagno;Vittorino Novello;Alessandra Ferrandino;Claudio Lovisolo;Jacobus J. Hunter
2018

Abstract

The berry shrinking phenomenon in cv Shiraz (Vitis vinifera L.) is to date much debated. Currently, the critical points in Shiraz pre-harvest shrinkage are: a) the role of the xylem during post-véraison; b) the existence and timing of xylematic back flow and c) the functionality of the phloem. In order to try to resolve these issues, we traced the xylematic flows from the vine to the berry and vice versa by using the fuchsin acid as a xylematic tracer. At berry maturity, in order to verify also the phloematic functionality, we used the fluorescent tracer 6(5)-carboxyfluorescein diacetate (CFDA). The results showed clearly that the vine gradually loses the ability to deliver water to the berries via pedicel during ripening. The xylematic back-flow is active in the pre-véraison but not in the post-véraison berries. Furthermore, the CFDA experiments showed the absence of flow from the plant to the berry and vice versa at berry maturity. In cv Shiraz véraison seems to be the crucial point in the berry dehydration understanding: in pre-véraison there is a ‘plant/berry’ and ‘berry/plant’ water communication, whereas in post-véraison this seems to cease progressively.
SCIENTIA HORTICULTURAE
233
394
406
http://www.sciencedirect.com/science/article/pii/S030442381830089X?via=ihub
Berry shrivel, Phloem, Phloematic tracer, Véraison, Xylem, Xylematic tracer, Berry maturity
Antonio Carlomagno, Vittorino Novello, Alessandra Ferrandino, Andrea Genre, Claudio Lovisolo, Jacobus J. Hunter
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S030442381830089X-main.pdf

non disponibili

Descrizione: pdf editoriale
Tipo di file: PDF EDITORIALE
Dimensione 1.37 MB
Formato Adobe PDF
1.37 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
preprint.pdf

accesso aperto

Tipo di file: PREPRINT (PRIMA BOZZA)
Dimensione 300.95 kB
Formato Adobe PDF
300.95 kB Adobe PDF Visualizza/Apri
preprint figure.pdf

accesso aperto

Descrizione: figure
Tipo di file: PREPRINT (PRIMA BOZZA)
Dimensione 10.33 MB
Formato Adobe PDF
10.33 MB Adobe PDF Visualizza/Apri
Scientia Horticulturae 233 (2018) 394–406.pdf

non disponibili

Tipo di file: PDF EDITORIALE
Dimensione 1.37 MB
Formato Adobe PDF
1.37 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1660643
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 9
social impact