神奈川県におけるミズガヤツリの種内変異と防除上の特性に関する研究 : 第3報塊茎形成期の系統間差異

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Tuberization of Cyperus serotinus Rottb., a perennial weed in paddy rice, is known to be enhanced under short day condition and to vary with time among the regions of Japan. Twenty-two strains of Cyperus serotinus Rottb. collected from 18 locations in Kanagawa prefecture were grown under natural day length and the time of tuber formation was examined. Results are as follows. (1) These strains were found to show differences in the time of tuber formation; the earliest formation. was on September 5 in Strain No. 18 and the latest on September 25 in Strains No. 4, the range of variations between the strains being 20 days. (2) Tuber formation was more delayed than heading in all the strains used at intervals of 6 days (No. 11) to 38 days (No. 4). (3) A low correlation coefficient (r-0. 025) was obtained between the heading time and the time of tuber formation. Therefore, it may be concluded that the two responses of the strains used, namely heading and tuberization were independent from one another.
1983-12-20