Apomixis. A form of parthenogenesis in plants in the broad sense, in which gametophyte cells other than egg cells (such as synergid cells) develop independently to produce a plant body without receiving a sperm nucleus. There are two types of apomixis: reproductive apomixis, which starts from a haploid cell, and vegetative apomixis, which starts from a diploid cell. There are many natural examples in ferns, but it can also be seen in Chinese chives and other seed plants. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
無配生殖。植物での広義の単為生殖の一形式で,卵細胞以外の配偶体の細胞 (助細胞など) が精核を受けずに,単独で発育して植物体ができること。出発点が単相核の細胞であるところの生殖的無配生殖と,複相核から出発する栄養的無配生殖があり,シダ類では自然に生じる例も多いが,ニラその他の種子植物でもみられることがある。
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