CHARACTERISTICS OF BERRY GROWTH IN CRACKING SUSCEPTIBLE TETRAPLOID GRAPEVINES
Berry cracking is one of the most serious problems for high quality table grape cultivation using tetraploid cultivars in Korea. Berry cracking patterns and factors were investigated through growth characteristics and morphological observation of berry between two tetraploids (Fujiminori and Kyoho) and compared with diploid Campbell Early which has different cracking susceptibility of berry. The stomata were scattered on ovary surface at full bloom stage and numbers of stomata were different: 16.5 in Fujiminori, 14.7 in Kyoho, and 9.95 in Campbell Early. The numbers of stomata at veraison stage, however, changed depending on location of berry to 9.8 (stylar end trisection), 6.2 (equatorial trisection), and 3.6 (stem end tri¬section) in Fujiminori and 5.3, 7.7, and 1.7 in Kyoho, and 2.7, 3.9, and 3.2 in Campbell Early. As berry growth advanced, patterns of distributed stomata changed and were different in each cultivar. The berry cracking rate at veraison of Fuji¬minori and Kyoho was remarkably high, 13.2 and 7.0%, compared with 0.6% in Campbell Early. Berry cracking-sensitive Fujiminori and Kyoho grapes showed rapid berry growth at stage III after veraison compared with cracking-insensitive Campbell Early. Depending on the locations of berry divided into the stylar end, equator, and stem-end, cracking rates were also different with 59.0, 34.5, and 6.5% in Kyoho and 74.5, 12.5, and 12.0% in Fujiminori. After the veraison stage, larger cracking of berry was observed from the fruit lenticels which were degenerated from stomata and stylar scar in Fujiminori compared with cracking resistant Campbell Early grape.
Heon-Kyu Lim, , In-Chang Son, , Sung-Il Oh, , Hyunsuk Shin, , Young-Jae Oh, , Seo-Jun Park, and Daeil Kim, (2014). CHARACTERISTICS OF BERRY GROWTH IN CRACKING SUSCEPTIBLE TETRAPLOID GRAPEVINES. Acta Hortic. 1046, 511-516
berry enlargement, fruit lenticel, pericarp, splitting, stylar scar, tetraploidy, veraison