タイヌビエの不斉一発生に関する種子生態学的研究 : 1. 種子重及び登熟日の着粒位置による個体内変異

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Arable weeds, in general, show an emergence pattern extending over a long period due to uneven seed germination and seedling growth. This phenomenon may be ascribed to the heterogeneous micro-environment which surrounds the seeds in soil, and to genetic and non-genetic variations of the soil-buried seed population. In this experiment, non-genetic variations in seed characters of Echinochloa oryzicola Vasing. such as seed weight and ripening date were studied among setting positions within a plant. 1. During the shattering period lasting for 30 days, the later the sampling date, the smaller the seed weight became. As a result, the weight of the seeds collected throughout the shattering period ranged from 0.9 to 4.3mg (Fig. 2, 3). 2. Seed weight and ripening date varied depending on the position within a plant. There were small variations in seed weight among primary rachis-branches, secondary rachis-branches and panicles with different heading dates, but large differences in seed weight were found among G_t (top grain in primary rachis-branch), G_I (apical grain in secondary rachis-branch), G_II (middle grain in secondary rachis-branch) and G_III (proximal grain in secondary rachis-branch) (Table 1, Fig. 4). G_t and G_I were heavier and matured earlier, G_III had a smaller weight, later ripening date and lower ripening percentage, while G_I showed an intermediate pattern between the two groups in these characters (Fig. 5). 3. The position effect and the pre-maturation conditioning, incluing variations in the seed weight and the ripening date, may be related to disorders of seed dormancy and seedling growth rate, which in turn may cause the asynchronous emergence of E. oryzicola in rice fields.
日本雑草学会の論文
1985-05-25

タイヌビエの不斉一発生に関する種子生態学的研究 : 1. 種子重及び登熟日の着粒位置による個体内変異

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