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2報塊茎萌芽特性及び初期生育特性の系統間差異

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The existence of intraspecific variations for certain characters in Cyperus serotinus Rottb. in Kanagawa Prefecture was described in a previous report. Variability in tuber dormancy, tuber germination and viability of young shoots among 22 strains was evaluated in this study. (1) High percentage of germination was obtained in the top tuber of all strains in January and March. In the middle tuber, however, a high percentage of germination was obtain ed in all the strains in March, while a few strains (No. 4, 5, 11) showed a low percentage in January. These findings suggest that variation among the strains in the degree of tuber dormancy was not observed in the top tuber, while in a few strains the middle tuber may have remained dormant in January. (2) In the study of tuber germination of 22 strains under 2 conditions (in water, in boiled water), statistical analysis showed significant differences at 1 percent level in the germination percentage, onset of germination, mean value of germination days, number of shoots per tuber, young plant height, fresh weight of shoots, fresh weight of roots, fresh weight of shoots/fresh weight of tuber and increase in the rate of plant height per day among the strains. Also these differences were more significant under strong reduction conditions (in boild water). (3) Of all the correlations between fresh weight of tuber and germination percentage, fresh weight of young shoots or increase in the rate of plant height per day, a low correlation coefficient was obtained except for the fresh weight of young shoots under mild reduction conditions (in water). Especially the correlation coefficient between fresh weight of tuber and the above mentioned characters showed negative values under strong reduction conditions (in boiled water). These findings suggest that the differences in these characters among the strains are due to quantitative differences of the tuber (tuber weight) as well as qualitative ones. (4) The differences in germination viability of tuber and early growth among the strains would suggest the importance of investigations on these characters in relation to weed control in order to improve the control measures at the early stage.
1983-12-20

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2報塊茎萌芽特性及び初期生育特性の系統間差異

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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2報 塊茎萌芽特性及び初期生育特性の系統間差異

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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2報塊茎萌芽特性及び初期生育特性の系統間差異