Effect of shoot vigor on the development of transmitting tissue and pollentube growth in pistils of tetraploid grape, cv. Pione

Effects of shoot vigor on the development of transmitting tissue (TT) and p ollen tube growth in pistils of Pione grapevines (a hybrid of Vitis vinifer a L. and V. labrusca L., tetraploid) were investigated anatomically. Shoot vigor was reduced by root zone restriction and pre-bloom shoot tipping, and was increased by severe winter pruning and application of high concentrati on fertilizer. The TT development in long and short shoots of the vines wit hout root restriction was also compared. In cross sections of the upper and middle ovaries, a thicker TT and more pollen tubes were found in root zone -restricted vines compared to unrestricted vines. Also, thicker TT and more pollen tubes were observed in less vigorous, short shoots of unrestricted vines. Tipping did not improve the TT development. However, spur pruning an d application of high concentration fertilizer to root zone-restricted vine s did not inhibit the TT development and pollen tube growth, though shoots grew vigorously. From these results, we conclude that promoted TT developme nt in less vigorous shoots of Pione grapevines allows for more pollen tubes to penetrate into the ovary, resulting in the production of acceptable clu sters with a sufficient number of seeded berries.