Effect of vertical and horizontal shoot training on photosynthesis and translocation of assimilates in grapevines [Vitis labrusca]
1996
Hino, A. (Ehime Univ., Matsuyama (Japan). Coll. of Agriculture) | Iguchi, N. | Amano, S. | Mizutani, F. | Kadoya, K.
The present work was carried out to determine the effect of vertical and horizontal shoot training on photosynthetic rate and distribution of photosynthates by using two-year-old potted "Delaware" grapevines (Vitis labruscana Bailey). Horizontally trained vines showed higher photosynthetic rates in leaves of upper parts of shoots that vertically trained vines, whereas the reverse was true in the leaves of lower parts of the shoots. Leaves of vines bearing berries seemed to exhibit greater photosynthetic rates than those of non-bearing vines irrespective of different training systems. Vertically trained vines accumulated more 13C assimilates in the internode portions but lower in the primary and lateral leaves than horizontally trained vines. The amount of 13C was higher in the flesh, skin and rachis of the cluster on horizontal vines but lower in seeds of the cluster of vertical vines. Slightly higher soluble solids content and lower titratable acidity were noted in the berries of vertically trained vined but the differences were not significant between the training systems
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