愛知県におけるペカンの開花と結実に関する研究

Abstract

Five cultivars of pecan, ‘Success’, ‘Nelies’, ‘Schley’, ‘Stuart’ and ‘Curtis, ’ were grown at the University Farm of Nagoya University, Togocho, Aichi Prefecture, and the flowering and fruiting of these cultivars were examined.1. The male catkins of pecan appear 1 aterally on the one-year-old shoots, and the female inflorescences occurred at the terminals of the shoots produced in the current year. The 5 cultivars flowered from late May to early June and the fruit matured in November. That is, the fruit required 154 to 182 days for maturation, and matured during the frost-free period.2. The studies on flowering showed that ‘Success’ flowered early each year with adicogamy or protandry. ‘Nelies’, ‘Schley’, ‘Stuart’, and ‘Curtis’ flowered relatively late with adicogamy or proterogyny.The studies on pollination and fruiting showed that ‘Success’, ‘Stuart’ and ‘Nelies’ were self-compatible, but it was questionable whether enough pollination would occur naturally. Since there are no plants of the Carya family in Japan, the importance of growing pollinator trees for shedding of pollen during the recipient stage of female inflorescences is stressed.3. The weight of 100 nuts of ‘Nelies’ was the heaviest, being about 600g, followed by ‘Success’, ‘Schley’ and ‘Stuart’ which weighed between 580 and 595g. The weight of 100 nuts of ‘Curtis’ was the lightest, being 290g. The percents of edible parts of the nuts were 55-39% in the five cultivars.