Comparative growth of persimmon seedling rootstocks in Thailand

摘要

Four persimmon seedling rootstocks (Diospyros kaki cv. 'Xichu' or 'P2'; D. lotus, green fruit and yellow fruit types; and D. glandulosa) were compared to investigate the suitability of these species and selections as rootstock for persimmon cultivar 'Fuyu'. D. lotus (green fruit type) had significantly higher seed germination than the other rootstocks. One-year-old seedlings differed in tree height and trunk diameter. D.lotus (green fruit type) had vigorous growth, but plant dry weight was lower than D. lotus (yellow fruit type) and D. glandulosa rootstock. D. glandulosa had the highest primary root dry weight (PDW) of 7.96 g and D. lotus (yellow fruit type) had the highest secondary root dry weight (SDW) of 5.22 g. The SDW/PDW ratio of D. glandulosa was higher than the other rootstocks, while the root/shoot (R/S ratio) and nitrogen concentration of the trunk, primary root and secondary root of 'P2' rootstock were higher than for other rootstocks. There were significant differences in grafting success among rootstocks. 'P2' rootstock had the highest grafting take (76%) and produced the greatest dry weight increase 1 year after grafting. Growth of 'Fuyu' scion was the highest on both types of D. lotus rootstock. The diameter of the graft-union was different for all rootstocks but the ratio of the diameter of scion and rootstock was about the same for all (1:1). All grafted plants, even on D. lotus rootstock, showed no signs of incompatibility and exhibited normal growth in the first year after grafting.