早生系'西条'ガキにおける多収系統の選抜(栽培管理・作型)  [in Japanese] Selection of High-Yielding Strains in Early-Ripening Typed 'Saijo' Persimmon(Crop Production & Cropping Type)  [in Japanese]

島根県では,'西条'の系統の中から遺伝的に早熟な系統を"B型"として選抜したが,"B型"には樹体生育や果実の特性が遺伝的に異なる複数の系統が存在する.そこで,"B型"系統中,起源が異なると考えられる6系統("安部","遠藤","Bわい性","山坂","古藤","和田")を供試し,樹体生育や果実品質および収量を調査して果実生産性の優れる系統を選抜した."古藤"系はわい性傾向が認められ,"安部"系は休眠芽の発芽不良の発生により生育が劣った."和田"系は新梢が徒長し,主幹の材積成長が旺盛であり,生産効率が劣り熟期も遅れた."山坂"系は,全供試系統の中で平均的な樹の生育を示した.樹冠占有面積率やLAIfが他系統と比較して高かった"遠藤"および"Bわい性"両系統は,同化産物の蓄積量が多く,果実および細根への分配率が高いことにより,高品質果実が連年10a当たり3t程度生産できるものと推定された.'西条'"B型"系統では,"遠藤"系が最も優れると考えられた.

Among strains of 'Saijo' Japanese persimmon (Diospyros, kaki, Thunb.) in Shimane prefecture, the genotypes with early fruit ripening were selected as "B-type". The "B-type" included some genetically different strains based on tree growth and fruit traits. We investigated differences in tree growth, fruit quality and yield among six strains from different origins: "Abe", "Endo", "B dwarf, "Yamasaka", "Koto" and "Wada" strains, and selected the strain with excellent the fruit production. A tendency toward dwarfing was observed in "Koto" strain. Also, as a physiological disorder of bud sprouting often occurred in the "Abe" strain, tree growth of "Koto" and "Abe" strains were inferior to the others. The "Wada" strain showed succulent shoot growth and vigorous growth of the trunk, while the yield was inferior to that of other strains and its fruit had a late ripening period. The "Yamasaka" strain showed a mean value in tree growth of all strains. The area percentage of tree canopy and leaf area index per field area (LAIf) were high in "Endo" and "B dwarf strains. Carbohydrate production in these strains was superior, and the distribution rate of carbohydrates was high in fruit and rootlet. It is thought that the fruit yield of about 3 t per 10 a every year with high quality can be expected in each strain of "Endo" and "B dwarf. It is thought that the "Endo" strain is the most excellent in "B-type" strains of 'Saijo'.