Vascular function in berries of Vitis vinifera (L) cv. Shiraz

• DOI: 10.1111/j.1755-0238.2001.tb00193.x
• Publication Date: 2008-03-12T10:22:39Z
• Authors: SUZY Y. ROGIERS; JASON A. SMITH; ROSEMARY WHITE; MARKUS KELLER; BRUNO P. HOLZAPFEL; JAMES M. VIRGONA
• Keywords: Veraison; Girdling; Pedicel

Anatomical studies on the movement of a xylem tracer dye were combined with functional changes in grape berry volume during final stages ripening to gauge effectiveness. Movement into pre-veraison fruit was compared post-veraison by feeding solution acid fuchsin excised shoots bunches still attached, and then sectioning for photo-microscopy. Those comparisons confirmed published showing an apparent blockage along major vessels within brush tissue fruit. However, our approach yielded different impression vascular activity. A continuation transport inferred from where pedicels either girdled (phloem interrupted, but intact) or (both phloem interrupted). Volume manipulated berries immediately adjacent intact control same bunch. Control lost subsequent 78 days after flowering (DAF) while first day treatment at 67 DAF. By harvest time 95 DAF, both had fallen 91% 46% maximum volumes recorded around Berry loss further enhanced deficit irrigation. We conclude that flow those Shiraz must have continued beyond veraison despite evidence vessel region analogous