Pseudogamous embryogenesis and the degree of parthenogenesis inAllium tuberosum
Pseudogamous embryogenesis and the degree of parthenogenesis inAllium tuberosum
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马铃薯假受精胚胎发生及孤雌生殖程度
DOI：
10.1007/bf00714561
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发表时间：
1992
影响因子：
--
通讯作者：
Y. Nagato
中科院分区：
文献类型：
--
作者：
A. Kojima;Y. Nagato
研究了双孢子无合子植物allium tuberosum的授粉花和未授粉花在胚珠内的卵胚和对足胚的早期发育。无论花是否授粉，自主卵胚和对足胚发生的频率几乎相同，并且在数天内几乎同步发育。胚乳酯酶的电泳分析证实了极核受精。因此，可以证实。Tuberosumis：假交配无合子。单性生殖的程度，以卵细胞显示自主胚胎发育的胚珠百分比计算，在6个品种中，范围在62%到94%之间，几乎等于先前报道的双孢子的程度。目前的结果表明，a的大部分未还原卵细胞和卵样对足细胞。tuberosum具有独立于授粉开始胚胎发生的能力。
Early stages of egg embryony and antipodal embryony in ovules from both pollinated and unpollinated flowers ofAllium tuberosum, a diplosporous apomict, were observed. Whether flowers were pollinated or not, autonomous egg and antipodal embryonies occurred at nearly equal frequencies and progressed almost synchronously for several days. An electrophoretic analysis of endosperm esterase demonstrated the fertilization of polar nuclei. It was thus confirmed thatA. tuberosumis a pseudogamous apomict. The degree of parthenogenesis, calculated as the percentage of ovules in which egg cells showed autonomous embryonic development, ranged between 62% and 94% among six cultivars and was nearly equal to the degree of diplospory previously reported. The present results show that most unreduced egg cells and egg-like antipodal cells ofA. tuberosumhave the ability to start embryogenesis independently of pollination.