スギの花成反応におよぼすジベレリン濃度と温度条件

概要

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Two-year-old clonal materials of Cryptomeria japonica D.DON were kept at three alternating sets of temperatures : 30℃ for day (6 : 00 a.m. to 6 : 00 p.m.) and 25℃ at night (6 : 00 p.m. to 6 : 00 a.m.), 25℃ for day and 20℃ at night, and 20℃ for day and 15℃ at night. Seedlings were sprayed with gibberellin (GA_3) solutions (50,100,200,300,and 400 ppm) two weeks after initiating the experiment. Among concentrations of GA_3,significant differences were seen in flower development ; that is, more male strobili were formed with lower concentrations of GA_3,whereas high concentrations of GA_3 reduced the number of male strobili formed. In contrast, female strobili were formed with high concentrations of GA_3. Male and female strobili were formed under the alternating temperature conditions of 20〜15℃ and 25〜20℃ more than under 30〜25℃. The height growth of seedlings was promoted more with 100,200,and 300 ppm concentrations of GA_3 than with higher and lower concentrations.
一般社団法人日本森林学会の論文
1985-10-25